diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/controller/ImController.java b/code/link56/link56-backend/src/main/java/cn/link56/im/controller/ImController.java
index 938e1fbb..81fb7f00 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/controller/ImController.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/controller/ImController.java
@@ -3,19 +3,11 @@ package cn.link56.im.controller;
 import cn.link56.common.BasePageVO;
 import cn.link56.common.Result;
 import cn.link56.common.context.UserContext;
-import cn.link56.im.model.dto.CreateFriendDTO;
-import cn.link56.im.model.dto.QueryFriendDTO;
-import cn.link56.im.model.dto.QueryGroupDTO;
-import cn.link56.im.model.vo.QueryFriendVO;
-import cn.link56.im.model.vo.QueryGroupVO;
-import cn.link56.im.service.ImFriendService;
-import cn.link56.im.service.ImGroupService;
-import org.apache.commons.lang3.ObjectUtils;
+import cn.link56.im.model.dto.*;
+import cn.link56.im.model.vo.*;
+import cn.link56.im.service.*;
 import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 import javax.annotation.Resource;
 import java.util.List;
@@ -28,6 +20,12 @@ public class ImController {
     private ImFriendService imFriendService;
     @Resource
     private ImGroupService imGroupService;
+    @Resource
+    private ImPrivateMessageService imPrivateMessageService;
+    @Resource
+    private ImGroupUserService imGroupUserService;
+    @Resource
+    private ImGroupMessageService imGroupMessageService;
 
     @PostMapping("/friend/create")
     public Result<Void> createFriend(@RequestBody @Validated CreateFriendDTO dto){
@@ -52,4 +50,43 @@ public class ImController {
         BasePageVO<QueryGroupVO> basePageVO = imGroupService.queryGroup(dto);
         return Result.success(basePageVO);
     }
+
+    @PostMapping("/friend/message/query")
+    public Result<List<QueryPrivateMessageVO>> queryPrivateMessage(@RequestBody QueryPrivateMessageDTO dto){
+        List<QueryPrivateMessageVO> list = imPrivateMessageService.queryPrivateMessages(dto);
+        return Result.success(list);
+    }
+
+    @PostMapping("/group/message/query")
+    public Result<List<QueryGroupMessageVO>> queryGroupMessage(@RequestBody QueryGroupMessageDTO dto){
+        List<QueryGroupMessageVO> list = imGroupMessageService.queryGroupMessages(dto);
+        return Result.success(list);
+    }
+
+    @PostMapping("/group/user/query")
+    public Result<List<QueryGroupUserVO>> queryGroupUser(@RequestBody QueryGroupUserDTO dto){
+        List<QueryGroupUserVO> list = imGroupUserService.queryGroupUsers(dto);
+        return Result.success(list);
+    }
+
+    @PostMapping("/private/update/unread")
+    public Result<Void> updatePrivateUnread(@RequestBody UpdatePrivateUnreadDTO dto){
+        Long userId = dto.getUserId();
+        Long friendId = dto.getFriendId();
+
+        imFriendService.decreaseUnreadCount(userId,friendId);
+
+        return Result.success();
+    }
+
+    @PostMapping("/group/update/unread")
+    public Result<Void> updateGroup(@RequestBody UpdateGroupUnreadDTO dto){
+        Long userId = dto.getUserId();
+        Long groupId = dto.getGroupId();
+
+        imGroupUserService.decreaseUnreadCount(groupId,userId);
+
+        return Result.success();
+    }
+
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/enums/MessageTypeEnums.java b/code/link56/link56-backend/src/main/java/cn/link56/im/enums/MessageTypeEnums.java
index 1381bcba..d60723e7 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/enums/MessageTypeEnums.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/enums/MessageTypeEnums.java
@@ -13,7 +13,8 @@ public enum MessageTypeEnums {
     OFFLINE(6),
     GROUP_OFFLINE(7),
     PRIVATE(8),
-    GROUP(9);
+    GROUP(9),
+    FRIEND_UPDATE(10);
 
     private final int code;
 
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/handler/MessageHandler.java b/code/link56/link56-backend/src/main/java/cn/link56/im/handler/MessageHandler.java
index 156f401b..fbaf856d 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/handler/MessageHandler.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/handler/MessageHandler.java
@@ -2,12 +2,22 @@ package cn.link56.im.handler;
 
 import cn.link56.auth.token.model.TokenPayload;
 import cn.link56.auth.token.service.AuthTokenService;
+import cn.link56.common.utils.TimeUtils;
+import cn.link56.common.utils.snowflake.idgen.IdGenerator;
+import cn.link56.company.model.po.CompanyUser;
+import cn.link56.company.service.CompanyUserService;
 import cn.link56.im.enums.MessageTypeEnums;
 import cn.link56.im.message.MessageRequest;
 import cn.link56.im.message.MessageResponse;
+import cn.link56.im.model.dto.GroupDTO;
 import cn.link56.im.model.dto.LoginDTO;
+import cn.link56.im.model.dto.PrivateDTO;
+import cn.link56.im.model.po.ImPrivateMessage;
+import cn.link56.im.model.vo.PrivateMessageVO;
+import cn.link56.im.model.vo.QueryFriendVO;
 import cn.link56.im.service.ImFriendService;
 import cn.link56.im.service.ImGroupUserService;
+import cn.link56.im.service.ImPrivateMessageService;
 import cn.link56.im.storage.SessionManager;
 import cn.link56.im.utils.MessageDataConverter;
 import cn.link56.im.utils.MessageWriter;
@@ -26,6 +36,10 @@ public class MessageHandler {
     private ImFriendService imFriendService;
     @Resource
     private ImGroupUserService imGroupUserService;
+    @Resource
+    private ImPrivateMessageService imPrivateMessageService;
+    @Resource
+    private CompanyUserService companyUserService;
 
     // 处理消息
     public void handleMessage(Channel channel, MessageRequest request) {
@@ -56,7 +70,6 @@ public class MessageHandler {
     }
 
     private void handleLogin(Channel channel, MessageRequest request) {
-        System.out.println("===LOGIN===");
         LoginDTO dto = MessageDataConverter.convert(request.getData(), LoginDTO.class);
         TokenPayload tokenPayload = authTokenService.parsePayload(dto.getToken());
 
@@ -77,8 +90,6 @@ public class MessageHandler {
     }
 
     private void handleLogout(Channel channel, MessageRequest request) {
-        System.out.println("===LOGOUT===");
-
         Long userId = SessionManager.getUserId(channel);
         if (ObjectUtils.isNotEmpty(userId)){
             handleOffline(channel , userId);
@@ -110,9 +121,78 @@ public class MessageHandler {
 
     // 私聊逻辑
     private void handlePrivate(Channel channel, MessageRequest request) {
+        Long from = request.getFrom();
+        Long to = request.getTo();
+
+        PrivateDTO dto = MessageDataConverter.convert(request.getData(), PrivateDTO.class);
+        String content = dto.getContent();
+        Integer type = dto.getType();
+        String tempId = dto.getTempId();
+
+        // 好友关系建立
+        imFriendService.createFriend(to,from);
+
+        // 通知建立了好友关系
+        if (SessionManager.isOnline(to)) {
+            CompanyUser companyUser = companyUserService.getById(from);
+            if (ObjectUtils.isNotEmpty(companyUser)){
+                QueryFriendVO queryFriendVO = new QueryFriendVO();
+                queryFriendVO.setFriendId(from);
+                queryFriendVO.setFriendName(companyUser.getName());
+                queryFriendVO.setFriendAvatar(companyUser.getAvatar());
+                queryFriendVO.setIsOnline(true);
+
+                queryFriendVO.setUnreadCount(0);
+
+                MessageWriter.writeToUser(to,MessageResponse.success(MessageTypeEnums.FRIEND_UPDATE,from).setData(queryFriendVO));
+            }
+        }
+
+        // 保存
+        Long privateMessageID = IdGenerator.nextId();
+        Long sendTime = TimeUtils.getCurrentTimestampMillis();
+
+        ImPrivateMessage imPrivateMessage = new ImPrivateMessage();
+        imPrivateMessage.setId(privateMessageID);
+        imPrivateMessage.setContent(content);
+        imPrivateMessage.setType(type);
+        imPrivateMessage.setSenderId(from);
+        imPrivateMessage.setReceiverId(to);
+        imPrivateMessage.setSendTime(sendTime);
+
+        imPrivateMessageService.save(imPrivateMessage);
+
+        // 更新状态表
+        imFriendService.updateLastMessageId(from,to,privateMessageID);
+        imFriendService.increaseUnreadCount(to,from,privateMessageID);
+
+        // 构建回复消息
+        PrivateMessageVO privateMessageVO = new PrivateMessageVO();
+        // 通知发送人
+        privateMessageVO.setTempId(tempId);
+        privateMessageVO.setId(privateMessageID);
+        privateMessageVO.setSenderId(from);
+        privateMessageVO.setReceiverId(to);
+        privateMessageVO.setContent(content);
+        privateMessageVO.setType(type);
+        privateMessageVO.setSendTime(sendTime);
+
+        MessageWriter.writeToUser(from,MessageResponse.success(MessageTypeEnums.PRIVATE,from).setData(privateMessageVO));
+
+        // 通知接受人
+        if (SessionManager.isOnline(to)){
+            MessageWriter.writeToUser(to,MessageResponse.success(MessageTypeEnums.PRIVATE,from).setData(privateMessageVO));
+        }
     }
 
     // 群聊逻辑
     private void handleGroup(Channel channel, MessageRequest request) {
+        Long from = request.getFrom();
+        Long to = request.getTo();
+
+        GroupDTO dto = MessageDataConverter.convert(request.getData(), GroupDTO.class);
+        String content = dto.getContent();
+        Integer type = dto.getType();
+        String tempId = dto.getTempId();
     }
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImFriendMapper.java b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImFriendMapper.java
index 5bbd22a1..45290105 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImFriendMapper.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImFriendMapper.java
@@ -22,5 +22,16 @@ public interface ImFriendMapper extends BaseMapper<ImFriend> {
     Long selectFriendTotal(
             @Param("userId") Long userId,
             @Param("name") String name
-                           );
+    );
+
+    void incrementUnreadAndUpdateLastMessage(
+            @Param("userId") Long userId,
+            @Param("friendId") Long friendId,
+            @Param("lastMessageId") Long lastMessageId
+    );
+
+    void decreaseUnreadCount(
+            @Param("userId") Long userId,
+            @Param("friendId") Long friendId
+    );
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupMessageMapper.java b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupMessageMapper.java
index 6e09b7a5..e61730a7 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupMessageMapper.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupMessageMapper.java
@@ -1,9 +1,19 @@
 package cn.link56.im.mapper;
 
 import cn.link56.im.model.po.ImGroupMessage;
+import cn.link56.im.model.vo.QueryGroupMessageVO;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
 
 @Mapper
 public interface ImGroupMessageMapper extends BaseMapper<ImGroupMessage> {
+    List<QueryGroupMessageVO> selectGroupMessages(
+            @Param("groupId") Long groupId,
+            @Param("pageSize") Integer pageSize,
+            @Param("beforeId") Long beforeId,
+            @Param("beforeTimestamp") Long beforeTimestamp
+    );
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupUserMapper.java b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupUserMapper.java
index 80fc7e6e..889d0bd4 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupUserMapper.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImGroupUserMapper.java
@@ -1,9 +1,17 @@
 package cn.link56.im.mapper;
 
 import cn.link56.im.model.po.ImGroupUser;
+import cn.link56.im.model.vo.QueryGroupUserVO;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
 
 @Mapper
 public interface ImGroupUserMapper extends BaseMapper<ImGroupUser> {
+    List<QueryGroupUserVO> selectGroupUsers(
+            @Param("groupId") Long groupId,
+            @Param("userName") String userName
+    );
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImPrivateMessageMapper.java b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImPrivateMessageMapper.java
index aeb64386..eb5f2db1 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImPrivateMessageMapper.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/mapper/ImPrivateMessageMapper.java
@@ -1,9 +1,20 @@
 package cn.link56.im.mapper;
 
 import cn.link56.im.model.po.ImPrivateMessage;
+import cn.link56.im.model.vo.QueryPrivateMessageVO;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
 
 @Mapper
 public interface ImPrivateMessageMapper extends BaseMapper<ImPrivateMessage> {
+    List<QueryPrivateMessageVO> selectPrivateMessages(
+            @Param("userId") Long userId,
+            @Param("friendId") Long friendId,
+            @Param("beforeId") Long beforeId,
+            @Param("beforeTimestamp") Long beforeTimestamp,
+            @Param("pageSize") Integer pageSize
+    );
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/message/MessageRequest.java b/code/link56/link56-backend/src/main/java/cn/link56/im/message/MessageRequest.java
index cff39ea4..900fa90c 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/message/MessageRequest.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/message/MessageRequest.java
@@ -12,7 +12,7 @@ import lombok.ToString;
 public class MessageRequest {
     private Integer type;
     private Long from;
-    private Object to;
+    private Long to;
     private Long timestamp;
     private Object data;
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/GroupDTO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/GroupDTO.java
new file mode 100644
index 00000000..2b90c247
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/GroupDTO.java
@@ -0,0 +1,14 @@
+package cn.link56.im.model.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class GroupDTO {
+    private String content;
+    private Integer type;
+    private String tempId;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/PrivateDTO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/PrivateDTO.java
new file mode 100644
index 00000000..b6014bec
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/PrivateDTO.java
@@ -0,0 +1,14 @@
+package cn.link56.im.model.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class PrivateDTO {
+    private String content;
+    private Integer type;
+    private String tempId;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryGroupMessageDTO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryGroupMessageDTO.java
new file mode 100644
index 00000000..9443dc40
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryGroupMessageDTO.java
@@ -0,0 +1,15 @@
+package cn.link56.im.model.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class QueryGroupMessageDTO {
+    private Long groupId;
+    private Long beforeTimestamp;
+    private Long beforeId;
+    private Integer pageSize;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryGroupUserDTO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryGroupUserDTO.java
new file mode 100644
index 00000000..8667146c
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryGroupUserDTO.java
@@ -0,0 +1,13 @@
+package cn.link56.im.model.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class QueryGroupUserDTO {
+    private Long groupId;
+    private String userName;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryPrivateMessageDTO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryPrivateMessageDTO.java
new file mode 100644
index 00000000..9c48d707
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/QueryPrivateMessageDTO.java
@@ -0,0 +1,16 @@
+package cn.link56.im.model.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class QueryPrivateMessageDTO {
+    private Long userId;
+    private Long friendId;
+    private Long beforeTimestamp;
+    private Long beforeId;
+    private Integer pageSize;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/UpdateGroupUnreadDTO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/UpdateGroupUnreadDTO.java
new file mode 100644
index 00000000..31e730fd
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/UpdateGroupUnreadDTO.java
@@ -0,0 +1,13 @@
+package cn.link56.im.model.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class UpdateGroupUnreadDTO {
+    private Long groupId;
+    private Long userId;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/UpdatePrivateUnreadDTO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/UpdatePrivateUnreadDTO.java
new file mode 100644
index 00000000..53c78dc8
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/dto/UpdatePrivateUnreadDTO.java
@@ -0,0 +1,13 @@
+package cn.link56.im.model.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class UpdatePrivateUnreadDTO {
+    private Long userId;
+    private Long friendId;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/po/ImPrivateMessage.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/po/ImPrivateMessage.java
index 1771d351..5c99ea52 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/model/po/ImPrivateMessage.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/po/ImPrivateMessage.java
@@ -4,6 +4,7 @@ import com.baomidou.mybatisplus.annotation.TableField;
 import com.baomidou.mybatisplus.annotation.TableId;
 import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.AllArgsConstructor;
+import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/PrivateMessageVO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/PrivateMessageVO.java
new file mode 100644
index 00000000..f745a680
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/PrivateMessageVO.java
@@ -0,0 +1,14 @@
+package cn.link56.im.model.vo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NoArgsConstructor;
+
+@EqualsAndHashCode(callSuper = true)
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class PrivateMessageVO extends QueryPrivateMessageVO {
+    private String tempId;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryFriendVO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryFriendVO.java
index b82dfee7..0a9b49a2 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryFriendVO.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryFriendVO.java
@@ -17,7 +17,7 @@ public class QueryFriendVO {
     private Integer unreadCount;
 
     private Long lastMessageId;
-    private Long laseMessageTime;
+    private Long lastMessageTime;
     private Integer lastMessageType;
     private String lastMessageContent;
 
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupMessageVO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupMessageVO.java
new file mode 100644
index 00000000..6eb861d5
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupMessageVO.java
@@ -0,0 +1,22 @@
+package cn.link56.im.model.vo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class QueryGroupMessageVO {
+    private Long id;
+    private Long groupId;
+
+    private Long senderId;
+    private String senderAvatar;
+    private String senderName;
+
+    private String content;
+    private Integer type;
+
+    private Long sendTime;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupUserVO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupUserVO.java
new file mode 100644
index 00000000..fea7cb9f
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupUserVO.java
@@ -0,0 +1,16 @@
+package cn.link56.im.model.vo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class QueryGroupUserVO {
+    private Long groupId;
+    private Long userId;
+    private String userAvatar;
+    private String userName;
+    private Boolean isOnline;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupVO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupVO.java
index bdde8b4f..ecc25497 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupVO.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryGroupVO.java
@@ -15,7 +15,7 @@ public class QueryGroupVO {
     private Integer unreadCount;
 
     private Long lastMessageId;
-    private Long laseMessageTime;
+    private Long lastMessageTime;
     private Integer lastMessageType;
     private String lastMessageContent;
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryPrivateMessageVO.java b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryPrivateMessageVO.java
new file mode 100644
index 00000000..eacc3848
--- /dev/null
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/model/vo/QueryPrivateMessageVO.java
@@ -0,0 +1,20 @@
+package cn.link56.im.model.vo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class QueryPrivateMessageVO {
+    private Long id;
+
+    private Long senderId;
+    private Long receiverId;
+
+    private String content;
+    private Integer type;
+
+    private Long sendTime;
+}
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImFriendService.java b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImFriendService.java
index 53e6da2b..d3c18a24 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImFriendService.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImFriendService.java
@@ -9,6 +9,7 @@ import cn.link56.im.model.po.ImFriend;
 import cn.link56.im.model.vo.QueryFriendVO;
 import cn.link56.im.storage.SessionManager;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import org.apache.ibatis.annotations.Mapper;
 import org.springframework.stereotype.Service;
@@ -33,7 +34,6 @@ public class ImFriendService extends ServiceImpl<ImFriendMapper, ImFriend> {
             return;
         }
 
-
         // 不存在则插入
         ImFriend imFriend = new ImFriend();
 
@@ -87,4 +87,20 @@ public class ImFriendService extends ServiceImpl<ImFriendMapper, ImFriend> {
     }
 
 
+    public void updateLastMessageId(Long userId,Long friendId,Long lastMessageId){
+        LambdaUpdateWrapper<ImFriend> updateWrapper = new LambdaUpdateWrapper<>();
+        updateWrapper.eq(ImFriend::getUserId,userId)
+                .eq(ImFriend::getFriendId,friendId)
+                .set(ImFriend::getLastMessageId,lastMessageId);
+
+        imFriendMapper.update(updateWrapper);
+    }
+
+    public void increaseUnreadCount(Long userId,Long friendId,Long lastMessageId){
+        imFriendMapper.incrementUnreadAndUpdateLastMessage(userId, friendId, lastMessageId);
+    }
+
+    public void decreaseUnreadCount(Long userId,Long friendId){
+        imFriendMapper.decreaseUnreadCount(userId, friendId);
+    }
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupMessageService.java b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupMessageService.java
index f5de34a0..2143de8d 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupMessageService.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupMessageService.java
@@ -1,11 +1,27 @@
 package cn.link56.im.service;
 
 import cn.link56.im.mapper.ImGroupMessageMapper;
+import cn.link56.im.model.dto.QueryGroupMessageDTO;
 import cn.link56.im.model.po.ImGroupMessage;
+import cn.link56.im.model.vo.QueryGroupMessageVO;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import org.springframework.stereotype.Service;
 
+import javax.annotation.Resource;
+import java.util.List;
+
 @Service
 public class ImGroupMessageService extends ServiceImpl<ImGroupMessageMapper, ImGroupMessage> {
+    @Resource
+    private ImGroupMessageMapper imGroupMessageMapper;
 
+    public List<QueryGroupMessageVO> queryGroupMessages(QueryGroupMessageDTO dto) {
+        Long groupId = dto.getGroupId();
+        Integer pageSize = dto.getPageSize();
+
+        Long beforeId = dto.getBeforeId();
+        Long beforeTimestamp = dto.getBeforeTimestamp();
+
+        return imGroupMessageMapper.selectGroupMessages(groupId,pageSize,beforeId,beforeTimestamp);
+    }
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupUserService.java b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupUserService.java
index 2294712e..1738d6e5 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupUserService.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImGroupUserService.java
@@ -1,9 +1,12 @@
 package cn.link56.im.service;
 
 import cn.link56.im.mapper.ImGroupUserMapper;
+import cn.link56.im.model.dto.QueryGroupUserDTO;
 import cn.link56.im.model.po.ImGroupUser;
+import cn.link56.im.model.vo.QueryGroupUserVO;
 import cn.link56.im.storage.SessionManager;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import org.springframework.stereotype.Service;
 
@@ -44,4 +47,27 @@ public class ImGroupUserService extends ServiceImpl<ImGroupUserMapper, ImGroupUs
                 .distinct() // 去重
                 .collect(Collectors.toList());
     }
+
+    public void decreaseUnreadCount(Long groupId,Long userId){
+        LambdaUpdateWrapper<ImGroupUser> updateWrapper = new LambdaUpdateWrapper<>();
+
+        updateWrapper.eq(ImGroupUser::getGroupId,groupId)
+                .eq(ImGroupUser::getUserId,userId)
+                .set(ImGroupUser::getUnreadCount,0);
+
+        imGroupUserMapper.update(updateWrapper);
+    }
+
+    public List<QueryGroupUserVO> queryGroupUsers(QueryGroupUserDTO dto) {
+        Long groupId = dto.getGroupId();
+        String userName = dto.getUserName();
+
+        List<QueryGroupUserVO> queryGroupUserVOS = imGroupUserMapper.selectGroupUsers(groupId, userName);
+
+        queryGroupUserVOS.forEach(item -> {
+            item.setIsOnline(SessionManager.isOnline(item.getUserId()));
+        });
+
+        return queryGroupUserVOS;
+    }
 }
diff --git a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImPrivateMessageService.java b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImPrivateMessageService.java
index dab3a364..0129e652 100644
--- a/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImPrivateMessageService.java
+++ b/code/link56/link56-backend/src/main/java/cn/link56/im/service/ImPrivateMessageService.java
@@ -1,10 +1,28 @@
 package cn.link56.im.service;
 
 import cn.link56.im.mapper.ImPrivateMessageMapper;
+import cn.link56.im.model.dto.QueryPrivateMessageDTO;
 import cn.link56.im.model.po.ImPrivateMessage;
+import cn.link56.im.model.vo.QueryPrivateMessageVO;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import org.springframework.stereotype.Service;
 
+import javax.annotation.Resource;
+import java.util.List;
+
 @Service
 public class ImPrivateMessageService extends ServiceImpl<ImPrivateMessageMapper, ImPrivateMessage> {
+    @Resource
+    private ImPrivateMessageMapper imPrivateMessageMapper;
+
+    public List<QueryPrivateMessageVO> queryPrivateMessages(QueryPrivateMessageDTO dto) {
+        Long userId = dto.getUserId();
+        Long friendId = dto.getFriendId();
+        Long beforeId = dto.getBeforeId();
+        Long beforeTimestamp = dto.getBeforeTimestamp();
+
+        Integer pageSize = dto.getPageSize();
+
+        return imPrivateMessageMapper.selectPrivateMessages(userId,friendId,beforeId,beforeTimestamp,pageSize);
+    }
 }
diff --git a/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImFriendMapper.xml b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImFriendMapper.xml
index d5f146e3..fbb10ab5 100644
--- a/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImFriendMapper.xml
+++ b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImFriendMapper.xml
@@ -46,4 +46,21 @@
         </if>
     </select>
 
+    <update id="incrementUnreadAndUpdateLastMessage">
+        UPDATE b_im_friend
+        SET
+            b_last_message_id = #{lastMessageId},
+            b_unread_count = b_unread_count + 1,
+            b_update_time = GETDATE()
+        WHERE b_user_id = #{userId} and b_friend_id = #{friendId}
+    </update>
+
+    <update id="decreaseUnreadCount">
+        UPDATE b_im_friend
+        SET
+            b_unread_count = 0,
+            b_update_time = GETDATE()
+        WHERE b_user_id = #{userId} and b_friend_id = #{friendId}
+    </update>
+
 </mapper>
diff --git a/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupMapper.xml b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupMapper.xml
index ec61e3ca..d2dff046 100644
--- a/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupMapper.xml
+++ b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupMapper.xml
@@ -8,28 +8,25 @@
     <select id="selectGroup" resultType="cn.link56.im.model.vo.QueryGroupVO">
         SELECT *
         FROM (
-        SELECT
-            g.b_id AS groupId,
-            g.b_name AS groupName,
-            g.b_avatar AS groupAvatar,
-            gu.b_unread_count AS unreadCount,
+            SELECT
+                g.b_id AS groupId,
+                g.b_name AS groupName,
+                g.b_avatar AS groupAvatar,
+                gu.b_unread_count AS unreadCount,
 
-            m.b_id AS lastMessageId,
-            m.b_send_time AS lastMessageTime,
-            m.b_type AS lastMessageType,
-            m.b_content AS lastMessageContent,
+                m.b_id AS lastMessageId,
+                m.b_send_time AS lastMessageTime,
+                m.b_type AS lastMessageType,
+                m.b_content AS lastMessageContent,
 
-            u.b_id AS lastMessageSenderId,
-            u.b_name AS lastMessageSenderName,
-            u.b_avatar AS lastMessageSenderAvatar,
+                u.b_id AS lastMessageSenderId,
+                u.b_name AS lastMessageSenderName,
 
-            ROW_NUMBER() OVER (
-            ORDER BY
-            <if test="id != null and id != 0">
-                CASE WHEN g.b_id = #{id} THEN 0 ELSE 1 END,
-            </if>
+                ROW_NUMBER() OVER (
+                ORDER BY
+                CASE WHEN #{id} IS NOT NULL AND #{id} != 0 AND g.b_id = #{id} THEN 0 ELSE 1 END,
                 m.b_send_time DESC
-            ) AS rn
+                ) AS rn
                 FROM b_im_group g
                 INNER JOIN b_im_group_user gu ON g.b_id = gu.b_group_id
                 LEFT JOIN b_im_group_message m ON gu.b_last_message_id = m.b_id
@@ -43,6 +40,7 @@
     </select>
 
 
+
     <select id="selectGroupTotal" resultType="java.lang.Long">
         SELECT COUNT(DISTINCT g.b_id)
         FROM b_im_group g
diff --git a/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupMessageMapper.xml b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupMessageMapper.xml
new file mode 100644
index 00000000..44d934be
--- /dev/null
+++ b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupMessageMapper.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="cn.link56.im.mapper.ImGroupMessageMapper">
+
+    <select id="selectGroupMessages" resultType="cn.link56.im.model.vo.QueryGroupMessageVO">
+        SELECT TOP (#{pageSize})
+        gm.b_id AS id,
+        gm.b_group_id AS groupId,
+        gm.b_sender_id AS senderId,
+        u.b_name AS senderName,
+        u.b_avatar AS senderAvatar,
+        gm.b_content AS content,
+        gm.b_type AS type,
+        gm.b_send_time AS sendTime
+        FROM b_im_group_message gm
+        LEFT JOIN b_company_user u ON gm.b_sender_id = u.b_id
+        WHERE gm.b_group_id = #{groupId}
+        <if test="beforeTimestamp != null and beforeId != null">
+            AND (
+            gm.b_send_time &lt; #{beforeTimestamp}
+            OR (gm.b_send_time = #{beforeTimestamp} AND gm.b_id &lt; #{beforeId})
+            )
+        </if>
+        ORDER BY gm.b_send_time DESC, gm.b_id DESC
+    </select>
+
+</mapper>
diff --git a/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupUserMapper.xml b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupUserMapper.xml
new file mode 100644
index 00000000..4c85b6f5
--- /dev/null
+++ b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImGroupUserMapper.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="cn.link56.im.mapper.ImGroupUserMapper">
+
+    <select id="selectGroupUsers" resultType="cn.link56.im.model.vo.QueryGroupUserVO" parameterType="map">
+        SELECT
+            gu.b_group_id AS groupId,
+            cu.b_id AS userId,
+            cu.b_avatar AS userAvatar,
+            cu.b_name AS userName
+        FROM
+            b_im_group_user gu
+            INNER JOIN
+            b_company_user cu
+            ON gu.b_user_id = cu.b_id
+        WHERE
+            gu.b_group_id = #{groupId}
+            <if test="userName != null and userName != ''">
+                AND cu.b_name LIKE '%' + #{userName} + '%'
+            </if>
+    </select>
+
+
+</mapper>
diff --git a/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImPrivateMessageMapper.xml b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImPrivateMessageMapper.xml
new file mode 100644
index 00000000..b120616a
--- /dev/null
+++ b/code/link56/link56-backend/src/main/resources/cn/link56/im/mapper/ImPrivateMessageMapper.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="cn.link56.im.mapper.ImPrivateMessageMapper">
+
+    <select id="selectPrivateMessages" resultType="cn.link56.im.model.vo.QueryPrivateMessageVO">
+        SELECT TOP (#{pageSize})
+        b_id AS id,
+        b_sender_id AS senderId,
+        b_receiver_id AS receiverId,
+        b_content AS content,
+        b_type AS type,
+        b_send_time AS sendTime
+        FROM b_im_private_message
+        WHERE
+        (
+        (b_sender_id = #{userId} AND b_receiver_id = #{friendId})
+        OR
+        (b_sender_id = #{friendId} AND b_receiver_id = #{userId})
+        )
+        <if test="beforeTimestamp != null and beforeId != null">
+            AND (
+            b_send_time &lt; #{beforeTimestamp}
+            OR (b_send_time = #{beforeTimestamp} AND b_id &lt; #{beforeId})
+            )
+        </if>
+        ORDER BY b_send_time DESC, b_id DESC
+    </select>
+
+</mapper>
diff --git a/code/link56/link56-backend/src/main/resources/cn/link56/post/mapper/PostStatMapper.xml b/code/link56/link56-backend/src/main/resources/cn/link56/post/mapper/PostStatMapper.xml
index 2bcb41e6..1f1df167 100644
--- a/code/link56/link56-backend/src/main/resources/cn/link56/post/mapper/PostStatMapper.xml
+++ b/code/link56/link56-backend/src/main/resources/cn/link56/post/mapper/PostStatMapper.xml
@@ -23,11 +23,12 @@
     <update id="decreaseCommentCount">
         UPDATE b_post_stat
         SET
-            b_comment_count = b_comment_count - #{count},
+            b_comment_count = CASE
+                                  WHEN b_comment_count - #{count} &lt; 0 THEN 0
+                                  ELSE b_comment_count - #{count}
+                END,
             b_update_time = GETDATE()
         WHERE b_post_id = #{postId}
-          AND b_comment_count >= #{count}
     </update>
 
-
-</mapper>
\ No newline at end of file
+</mapper>
diff --git a/code/link56/link56-frontend-new/eslint.config.js b/code/link56/link56-frontend-new/eslint.config.js
index 5def99ee..b7c3d02c 100644
--- a/code/link56/link56-frontend-new/eslint.config.js
+++ b/code/link56/link56-frontend-new/eslint.config.js
@@ -15,5 +15,6 @@ export default antfu({
     'node/prefer-global/process': 'off',
     '@typescript-eslint/no-require-imports': 'off',
     'no-useless-catch': 'off',
+    '@typescript-eslint/no-use-before-define': 'off',
   },
 })
diff --git a/code/link56/link56-frontend-new/src/hooks/useScrollWatcher.ts b/code/link56/link56-frontend-new/src/hooks/useScrollWatcher.ts
new file mode 100644
index 00000000..b88562bd
--- /dev/null
+++ b/code/link56/link56-frontend-new/src/hooks/useScrollWatcher.ts
@@ -0,0 +1,106 @@
+import type { Ref } from 'vue'
+import { onUnmounted, watch } from 'vue'
+
+interface UseScrollWatcherOptions {
+  target: Ref<HTMLElement | null>
+  thresholdPercent?: number
+  delay?: number
+  onReachTop?: () => void
+  onReachBottom?: () => void
+}
+
+export function useScrollWatcher({
+  target,
+  thresholdPercent = 0.05,
+  delay = 0,
+  onReachTop,
+  onReachBottom,
+}: UseScrollWatcherOptions) {
+  if (!target)
+    throw new Error('target 必须传入一个 ref')
+
+  let lastScrollTop = 0
+  let timeout: ReturnType<typeof setTimeout> | null = null
+  const topTriggered = { value: false }
+  const bottomTriggered = { value: false }
+
+  const handleScroll = (e: Event) => {
+    const el = e.target as HTMLElement
+    const scrollTop = el.scrollTop
+    const scrollHeight = el.scrollHeight
+    const clientHeight = el.clientHeight
+    const scrollRange = scrollHeight - clientHeight
+    if (scrollRange <= 0)
+      return
+
+    const isScrollingUp = scrollTop < lastScrollTop
+    const isScrollingDown = scrollTop > lastScrollTop
+    lastScrollTop = scrollTop
+
+    const topThreshold = scrollRange * thresholdPercent
+    const bottomThreshold = scrollRange * thresholdPercent
+
+    if (timeout)
+      clearTimeout(timeout)
+
+    timeout = setTimeout(() => {
+      if (isScrollingUp && scrollTop <= topThreshold && !topTriggered.value) {
+        onReachTop?.()
+        topTriggered.value = true
+      }
+      else if (scrollTop > topThreshold) {
+        topTriggered.value = false
+      }
+
+      if (isScrollingDown && scrollHeight - scrollTop - clientHeight <= bottomThreshold && !bottomTriggered.value) {
+        onReachBottom?.()
+        bottomTriggered.value = true
+      }
+      else if (scrollHeight - scrollTop - clientHeight > bottomThreshold) {
+        bottomTriggered.value = false
+      }
+    }, delay)
+  }
+
+  const bindScroll = (el: HTMLElement | null) => {
+    if (!el)
+      return
+    el.addEventListener('scroll', handleScroll)
+    lastScrollTop = el.scrollTop
+  }
+
+  const unbindScroll = (el: HTMLElement | null) => {
+    if (!el)
+      return
+    el.removeEventListener('scroll', handleScroll)
+  }
+
+  // 监听 ref
+  watch(target, (el, oldEl) => {
+    if (oldEl)
+      unbindScroll(oldEl)
+    if (el)
+      bindScroll(el)
+  })
+
+  onUnmounted(() => {
+    if (target.value)
+      unbindScroll(target.value)
+    if (timeout)
+      clearTimeout(timeout)
+  })
+
+  const scrollToTop = () => {
+    if (target.value)
+      target.value.scrollTop = 0
+  }
+
+  const scrollToBottom = () => {
+    if (target.value) {
+      const el = target.value
+      el.scrollTop = el.scrollHeight - el.clientHeight
+    }
+  }
+
+  return { scrollToTop, scrollToBottom }
+}
diff --git a/code/link56/link56-frontend-new/src/request/api/im/index.ts b/code/link56/link56-frontend-new/src/request/api/im/index.ts
index 5ff3fe65..d68ec076 100644
--- a/code/link56/link56-frontend-new/src/request/api/im/index.ts
+++ b/code/link56/link56-frontend-new/src/request/api/im/index.ts
@@ -1,4 +1,4 @@
-import type { CreateFriendParams, ImFriend, ImGroup, QueryFriendParams, QueryGroupParams } from '@/types/im'
+import type { CreateFriendParams, ImFriend, ImGroup, ImGroupMessage, ImGroupUser, ImPrivateMessage, QueryFriendParams, QueryGroupMessageParams, QueryGroupParams, QueryGroupUserParams, QueryPrivateMessageParams, UpdateGroupUnreadParams, UpdatePrivateUnreadParams } from '@/types/im'
 import { httpPostJson } from '@/request/utils'
 
 export function createFriendApi(params: CreateFriendParams) {
@@ -12,3 +12,22 @@ export function queryFriendApi(params: QueryFriendParams) {
 export function queryGroupApi(params: QueryGroupParams) {
   return httpPostJson<BasePageResult<ImGroup>>('/im/group/query', params)
 }
+
+export function queryPrivateMessageApi(params: QueryPrivateMessageParams) {
+  return httpPostJson<ImPrivateMessage[]>('/im/friend/message/query', params)
+}
+export function queryGroupMessageApi(params: QueryGroupMessageParams) {
+  return httpPostJson<ImGroupMessage[]>('/im/group/message/query', params)
+}
+
+export function updateGroupUnreadApi(params: UpdateGroupUnreadParams) {
+  return httpPostJson<void>('/im/group/update/unread', params)
+}
+
+export function updatePrivateUnreadApi(params: UpdatePrivateUnreadParams) {
+  return httpPostJson<void>('/im/private/update/unread', params)
+}
+
+export function queryGroupUserApi(params: QueryGroupUserParams) {
+  return httpPostJson<ImGroupUser[]>('/im/group/user/query', params)
+}
diff --git a/code/link56/link56-frontend-new/src/store/websocket.ts b/code/link56/link56-frontend-new/src/store/websocket.ts
index 1c143e00..023673ea 100644
--- a/code/link56/link56-frontend-new/src/store/websocket.ts
+++ b/code/link56/link56-frontend-new/src/store/websocket.ts
@@ -190,6 +190,9 @@ function createWebSocket(options?: Partial<UseWebSocketOptions>) {
       data: data ?? null,
     }
 
+    console.log('===发送消息===')
+    console.log(msg)
+
     ws.send(JSON.stringify(msg))
   }
 
@@ -248,11 +251,11 @@ function createWebSocket(options?: Partial<UseWebSocketOptions>) {
 
   /* ================== 业务 API ================== */
 
-  function sendPrivate(toUserId: number, content: string) {
-    send(MessageType.PRIVATE, { content }, toUserId)
+  function sendPrivate(toUserId: number, content: any) {
+    send(MessageType.PRIVATE, content, toUserId)
   }
 
-  function sendGroup(groupId: number, content: string) {
+  function sendGroup(groupId: number, content: any) {
     send(MessageType.GROUP, { groupId, content })
   }
 
diff --git a/code/link56/link56-frontend-new/src/types/im/index.ts b/code/link56/link56-frontend-new/src/types/im/index.ts
index 79209afc..682c9b44 100644
--- a/code/link56/link56-frontend-new/src/types/im/index.ts
+++ b/code/link56/link56-frontend-new/src/types/im/index.ts
@@ -13,6 +13,7 @@ export enum MessageType {
 
   PRIVATE = 8,
   GROUP = 9,
+  FRIEND_UPDATE = 10,
 }
 
 export interface MessageRequest {
@@ -82,4 +83,72 @@ export interface ImGroup {
   lastMessageTime: number
   lastMessageType: number
   lastMessageContent: string
+
+  lastMessageSenderId: number
+  lastMessageSenderName: string
+}
+
+export interface QueryPrivateMessageParams {
+  userId: number
+  friendId: number
+  beforeId: number | null
+  beforeTimestamp: number | null
+  pageSize: number
+}
+
+export interface ImPrivateMessage {
+  id: number
+  senderId: number
+  receiverId: number
+  content: string
+  type: number
+  sendTime: number
+
+  _showTime?: boolean
+  _tempId?: string
+  _status?: 'sent' | 'sending' | 'failed'
+}
+
+export interface QueryGroupMessageParams {
+  groupId: number
+  beforeId: number | null
+  beforeTimestamp: number | null
+  pageSize: number
+}
+
+export interface ImGroupMessage {
+  id: number
+  groupId: number
+  senderId: number
+  senderAvatar: string
+  senderName: string
+  content: string
+  type: number
+  sendTime: number
+
+  _showTime?: boolean
+  _tempId?: string
+  _status?: 'sent' | 'sending' | 'failed'
+}
+
+export interface UpdatePrivateUnreadParams {
+  userId: number
+  friendId: number
+}
+export interface UpdateGroupUnreadParams {
+  groupId: number
+  userId: number
+}
+
+export interface QueryGroupUserParams {
+  groupId: number
+  userName: string
+}
+
+export interface ImGroupUser {
+  groupId: number
+  userId: number
+  userAvatar: string
+  userName: string
+  isOnline: boolean
 }
diff --git a/code/link56/link56-frontend-new/src/utils/time.ts b/code/link56/link56-frontend-new/src/utils/time.ts
index f3bb96f6..24e25dc7 100644
--- a/code/link56/link56-frontend-new/src/utils/time.ts
+++ b/code/link56/link56-frontend-new/src/utils/time.ts
@@ -164,3 +164,4 @@ export function formatImTime(timestamp: number | null | undefined, mode: 'list'
 
   return ymd
 }
+
diff --git a/code/link56/link56-frontend-new/src/utils/uuid.ts b/code/link56/link56-frontend-new/src/utils/uuid.ts
new file mode 100644
index 00000000..f19e9e44
--- /dev/null
+++ b/code/link56/link56-frontend-new/src/utils/uuid.ts
@@ -0,0 +1,7 @@
+export function generateUUID(): string {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+    const r = Math.random() * 16 | 0
+    const v = c === 'x' ? r : (r & 0x3 | 0x8)
+    return v.toString(16)
+  })
+}
diff --git a/code/link56/link56-frontend-new/src/views/im/components/GroupChatWindows.vue b/code/link56/link56-frontend-new/src/views/im/components/GroupChatWindows.vue
new file mode 100644
index 00000000..6c41fae7
--- /dev/null
+++ b/code/link56/link56-frontend-new/src/views/im/components/GroupChatWindows.vue
@@ -0,0 +1,583 @@
+<script lang="ts" setup>
+import type { PropType } from 'vue'
+import type { ImGroup, ImGroupMessage, ImGroupUser } from '@/types/im'
+import { ElMessage } from 'element-plus'
+import { computed, nextTick, onMounted, ref, watch } from 'vue'
+import { useScrollWatcher } from '@/hooks/useScrollWatcher'
+import { queryGroupMessageApi, queryGroupUserApi } from '@/request/api/im'
+import { useUserStore } from '@/store/user'
+import { useWebSocket } from '@/store/websocket'
+import { formatImTime } from '@/utils/time'
+import { generateUUID } from '@/utils/uuid'
+
+const props = defineProps({
+  group: { type: Object as PropType<ImGroup>, required: true },
+})
+
+// websocket
+const websocket = useWebSocket()
+
+onMounted(() => {
+  const userId = useUserStore().user.id
+
+  websocket.onMessage(async (msg) => {
+    const { from, type, data } = msg
+  })
+})
+
+// 聊天框
+const chatInputRef = ref<HTMLDivElement | null>(null)
+const chatInputValue = ref('')
+const chatSendLoading = ref(false)
+
+const userStore = useUserStore()
+
+// 私聊消息列表
+const messages = ref<ImGroupMessage[]>([])
+const pagination = ref({
+  pageSize: 10,
+  loading: false,
+  hasMore: true,
+})
+
+const timeMessages = computed(() => processMessagesWithTime(messages.value))
+
+const groupUsers = ref<ImGroupUser[]>([])
+
+watch(
+  () => props.group,
+  (newVal) => {
+    if (newVal !== null) {
+      messages.value = []
+      pagination.value = { pageSize: 10, loading: false, hasMore: true }
+      loadMessages('down')
+
+      loadGroupUsers()
+    }
+  },
+  { immediate: true },
+)
+
+// ref
+const messageListRef = ref()
+const { scrollToBottom: scrollToLatestMessage } = useScrollWatcher({
+  target: messageListRef,
+  onReachTop: () => {
+    let loading = false
+    let hasMore = false
+
+    loading = pagination.value.loading
+    hasMore = pagination.value.hasMore
+
+    if (loading)
+      return
+
+    if (!hasMore) {
+      ElMessage.warning('没有更多消息了')
+    }
+
+    loadMessages('up')
+  },
+})
+
+/**
+ * 处理聊天消息，生成 _showTime 字段
+ * 如果与上一条消息相差超过 5 分钟，则显示时间
+ */
+function processMessagesWithTime(messages: ImGroupMessage[]) {
+  let lastTimestamp = 0
+
+  return messages.map((msg: ImGroupMessage) => {
+    if (!msg.sendTime)
+      return { ...msg, _showTime: null }
+
+    const ts = msg.sendTime
+    const showTime = !lastTimestamp || ts - lastTimestamp > 5 * 60 * 1000
+    lastTimestamp = ts
+
+    return { ...msg, _showTime: showTime ? formatImTime(ts, 'chat') : null }
+  })
+}
+
+// 加载私聊消息
+async function loadMessages(direction = 'down') {
+  if (direction === 'up' && !pagination.value.hasMore)
+    return
+
+  pagination.value.loading = true
+
+  const userId = userStore.user.id
+
+  let beforeTimestamp: number | null = null
+  let beforeId: number | null = null
+
+  if (direction === 'up' && messages.value.length > 0) {
+    const firstMsg = messages.value[0]
+    beforeTimestamp = firstMsg.sendTime
+    beforeId = firstMsg.id
+  }
+
+  try {
+    const res = await queryGroupMessageApi({
+      groupId: props.group.groupId,
+      pageSize: pagination.value.pageSize,
+      beforeTimestamp,
+      beforeId,
+    })
+
+    if (res.isSuccess) {
+      const records = res.data.reverse()
+
+      if (direction === 'down') {
+        messages.value = records
+        await nextTick()
+        scrollToLatestMessage()
+      }
+      else if (direction === 'up') {
+        if (records.length === 0) {
+          pagination.value.hasMore = false
+          ElMessage.warning('没有更多消息了')
+        }
+        else {
+          messages.value.unshift(...records)
+        }
+      }
+    }
+    else {
+      ElMessage.error(res.message || '加载消息失败，请稍后再试')
+    }
+  }
+  catch (err) {
+    console.error(err)
+    ElMessage.error('加载消息失败，请稍后再试')
+  }
+  finally {
+    pagination.value.loading = false
+  }
+}
+
+async function loadGroupUsers() {
+  queryGroupUserApi({
+    groupId: props.group.groupId,
+    userName: '',
+  }).then((res) => {
+    if (res.isSuccess) {
+      groupUsers.value = res.data
+    }
+    else {
+      ElMessage.error(res.message || '获取群组成员列表失败，请稍后再试')
+    }
+  }).catch((err) => {
+    console.log(err)
+    ElMessage.error('获取群组成员失败，请稍后再试')
+  })
+}
+
+// 聊天框输入事件
+function handleChatInputChange(event: Event) {
+  const target = event.target as HTMLElement
+  // 去除首尾空格
+  chatInputValue.value = (target.textContent || '').trim()
+}
+
+// 聊天框回车事件
+function handleChatInputKeyDown(event: KeyboardEvent) {
+  // 判断是否是回车键
+  if (event.key === 'Enter') {
+    event.preventDefault()
+    if (!chatSendLoading.value) {
+      sendMessage()
+    }
+  }
+}
+
+async function sendMessage() {
+  const content = chatInputValue.value?.trim()
+  if (!content) {
+    ElMessage.warning('发送消息不能为空')
+  }
+
+  // const userId = userStore.user.id
+  // const _tempId = generateUUID()
+
+  // const localMessage: ImPrivateMessage = {
+  //   id: -Date.now(),
+  //   senderId: userId,
+  //   receiverId: props.friend.friendId,
+  //   content,
+  //   type: 0,
+  //   sendTime: Date.now(),
+  //   _tempId,
+  //   _status: 'sending',
+  // }
+
+  // messages.value.push(localMessage)
+
+  // // 清空输入框
+  // if (chatInputRef.value) {
+  //   chatInputRef.value.innerHTML = ''
+  // }
+
+  // const privateData: any = {
+  //   content,
+  //   type: 0,
+  //   tempId: _tempId,
+  // }
+
+  // websocket.sendPrivate(props.friend.friendId, privateData)
+
+  // chatInputValue.value = ''
+  // // 等待 DOM 更新再滚动到底部
+  // await nextTick()
+  // scrollToLatestMessage()
+}
+</script>
+
+<template>
+  <el-splitter layout="vertical">
+    <el-splitter-panel>
+      <div ref="messageListRef" class="im__chat-main">
+        <div v-if="pagination.loading" class="im__chat-message-loading">
+          <SvgIcon icon="svg-spinners:180-ring" color="#1553f1" />
+        </div>
+        <div
+          v-for="item in timeMessages"
+          :key="item.id"
+          class="im__chat-message-wrapper"
+        >
+          <div v-if="item._showTime" class="im__chat-message-time">
+            {{ item._showTime }}
+          </div>
+          <div
+            class="im__chat-message"
+            :class="userStore.user.id === item.senderId
+              ? 'im__chat-message--from'
+              : 'im__chat-message--to'"
+          >
+            <div class="im__chat-message-avatar">
+              <SafeImage :url="item.senderAvatar" :size="40" round />
+            </div>
+            <div class="im__chat-message-body">
+              <div class="im__chat-message-name">
+                {{ item.senderName }}
+              </div>
+              <div class="im__chat-message-content">
+                <div v-if="item._status && item._status !== 'sent'" class="im__chat-message-status">
+                  <SvgIcon
+                    v-if="item._status === 'sending'"
+                    icon="svg-spinners:180-ring"
+                    color="#1553f1"
+                  />
+                  <SvgIcon
+                    v-else-if="item._status === 'failed'"
+                    icon="material-symbols:error"
+                    color="red"
+                  />
+                </div>
+                <div class="im__chat-message-content--text">
+                  {{ item.content }}
+                </div>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </el-splitter-panel>
+    <el-splitter-panel :min="100" :max="300" :size="150">
+      <div class="im__chat-footer">
+        <div class="im__chat-toolbar">
+          <SvgIcon icon="proicons:emoji" :size="20" />
+
+          <div class="im__chat-toolbar-right">
+            <SvgIcon icon="solar:history-broken" :size="20" />
+          </div>
+        </div>
+        <div class="im__chat-editor">
+          <div
+            ref="chatInputRef"
+            class="im__chat-editor-input"
+            contenteditable="true"
+            @input="handleChatInputChange"
+            @keydown="handleChatInputKeyDown"
+          />
+        </div>
+        <div class="im__chat-sendarea">
+          <el-button type="primary" size="small" class="im__chat-send">
+            发送（回车）
+          </el-button>
+        </div>
+      </div>
+    </el-splitter-panel>
+  </el-splitter>
+  <div class="im__chat-group">
+    <div class="im__group-section-header">
+      <!-- <el-input placeholder="请根据名称搜索" :prefix-icon="Search" /> -->
+      <div class="im__group-section-header-title">
+        <SvgIcon icon="bi:people" :size="18" color="#666666" />
+        <span class="im__group-section-header-text">群成员({{ groupUsers.length }})</span>
+      </div>
+      <div class="im__group-section-header-extra">
+        <div class="im__group-section-header--search">
+          <SvgIcon icon="lucide:search" :size="16" />
+        </div>
+      </div>
+    </div>
+
+    <div class="im__group-section-body">
+      <div v-for="item in groupUsers" :key="item.userId" class="im__group-item">
+        <el-badge
+          is-dot
+          :color="item.isOnline ? '#24e68a' : '#bfbfbf'"
+          :badge-style="{
+            width: '12px',
+            height: '12px',
+          }"
+          :offset="[-4, 34]"
+        >
+          <SafeImage :url="item.userAvatar" :size="40" round />
+        </el-badge>
+        <div class="im__group-item-info">
+          <div class="im__group-item-name">
+            {{ item.userName }}
+          </div>
+          <!-- <div class="im__group-item-desc">
+            desc
+          </div> -->
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style lang="scss" scoped>
+.im__chat-main {
+  padding: 16px 8px;
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+  width: 100%;
+  scrollbar-gutter: stable both-edges;
+  overflow-y: auto;
+  min-width: 0;
+  background-color: #ffffff;
+  height: 100%;
+  .im__chat-message-loading {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 100%;
+    font-size: 14px;
+  }
+
+  .im__chat-message-wrapper {
+    width: 100%;
+    position: relative;
+  }
+
+  .im__chat-message-time {
+    width: 100%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 14px;
+    color: #666;
+  }
+
+  .im__chat-message {
+    display: flex;
+    width: fit-content;
+    width: 100%;
+    .im__chat-message-avatar {
+      flex-shrink: 0;
+    }
+    .im__chat-message-body {
+      width: 100%;
+      .im__chat-message-name {
+        font-size: 14px;
+        line-height: 1;
+      }
+      .im__chat-message-content {
+        display: inline-flex;
+        align-items: center;
+        margin-top: 8px;
+        max-width: 70%;
+      }
+
+      .im__chat-message-content--text {
+        background-color: #ddd;
+        color: #000000;
+        word-break: break-all;
+        padding: 6px 12px;
+        border-radius: 4px;
+        text-align: left;
+      }
+    }
+  }
+  .im__chat-message--from {
+    align-self: flex-end;
+    flex-direction: row-reverse;
+    .im__chat-message-body {
+      margin-right: 8px;
+      text-align: right;
+      .im__chat-message-content--text {
+        background-color: #3c73ff;
+        color: #fff;
+      }
+      .im__chat-message-name {
+        text-align: right;
+      }
+
+      .im__chat-message-status {
+        margin-right: 8px;
+      }
+    }
+  }
+  .im__chat-message--to {
+    text-align: left;
+    align-items: flex-start;
+    .im__chat-message-body {
+      margin-left: 8px;
+      .im__chat-message-status {
+        margin-left: 8px;
+      }
+    }
+  }
+}
+
+.im__chat-group {
+  width: 300px;
+  border-left: 1px solid #e6e9ef;
+  min-height: 0;
+  display: flex;
+  flex-direction: column;
+  flex-shrink: 0;
+
+  .im__group-section-header {
+    height: 46px;
+    border-bottom: 1px solid #e6e9ef;
+    display: flex;
+    align-items: center;
+    padding: 0px 8px;
+    justify-content: space-between;
+    .im__group-section-header-title {
+      display: flex;
+      align-items: center;
+    }
+    .im__group-section-header-text {
+      margin-left: 4px;
+      line-height: 1;
+      font-size: 14px;
+    }
+
+    .im__group-section-header--search {
+      cursor: pointer;
+      color: #666666;
+      &:hover {
+        color: #1553f1 !important;
+      }
+    }
+  }
+
+  .im__group-section-body {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    overflow-y: auto;
+    min-height: 0;
+
+    .im__group-item {
+      height: 64px;
+      padding: 0 10px;
+      display: flex;
+      align-items: center;
+      cursor: pointer;
+      flex-shrink: 0;
+      &:hover {
+        background-color: #f5f7fa;
+      }
+
+      .im__group-item-info {
+        margin-left: 8px;
+        .im__group-item-name {
+          line-height: 1;
+          font-size: 14px;
+        }
+        .im__group-item-desc {
+          margin-top: 8px;
+          font-size: 12px;
+          color: #666;
+        }
+      }
+    }
+  }
+}
+
+.im__chat-footer {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  width: 100%;
+  height: 100%;
+
+  .im__chat-toolbar {
+    height: 36px;
+    flex-shrink: 0;
+    display: flex;
+    align-items: center;
+    padding: 0px 8px;
+    gap: 8px;
+    .im__chat-toolbar-right {
+      margin-left: auto;
+    }
+  }
+
+  .im__chat-editor {
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+    overflow-y: auto;
+    flex: 1;
+    min-height: 0;
+    width: 100%;
+    scrollbar-gutter: stable both-edges;
+
+    .im__chat-editor-input {
+      padding: 4px;
+      flex: 1;
+      // overflow-y: auto;
+      box-sizing: border-box;
+      border: none;
+      resize: none;
+      background-color: transparent;
+      outline: none;
+
+      word-wrap: break-word;
+      word-break: break-all;
+      white-space: pre-wrap;
+
+      -webkit-user-select: text;
+      -moz-user-select: text;
+      user-select: text;
+      cursor: text;
+    }
+    .im__chat-editor-input:empty::before {
+      content: attr(data-placeholder);
+      color: #aaa;
+      pointer-events: none;
+      display: block;
+    }
+  }
+
+  .im__chat-sendarea {
+    height: 36px;
+    flex-shrink: 0;
+    display: flex;
+    align-items: center;
+    margin-left: auto;
+    padding: 0px 16px;
+    .im__chat-send {
+      background-color: #1553f1;
+    }
+  }
+}
+</style>
diff --git a/code/link56/link56-frontend-new/src/views/im/components/PrivateChatWindow.vue b/code/link56/link56-frontend-new/src/views/im/components/PrivateChatWindow.vue
new file mode 100644
index 00000000..c05defdf
--- /dev/null
+++ b/code/link56/link56-frontend-new/src/views/im/components/PrivateChatWindow.vue
@@ -0,0 +1,570 @@
+<script lang="ts" setup>
+import type { PropType } from 'vue'
+import type { ImFriend, ImPrivateMessage } from '@/types/im'
+import { ElMessage } from 'element-plus'
+import { computed, nextTick, onMounted, ref, watch } from 'vue'
+import { useScrollWatcher } from '@/hooks/useScrollWatcher'
+import { queryPrivateMessageApi } from '@/request/api/im'
+import { useUserStore } from '@/store/user'
+import { useWebSocket } from '@/store/websocket'
+import { MessageType } from '@/types/im'
+import { formatImTime } from '@/utils/time'
+import { generateUUID } from '@/utils/uuid'
+
+const props = defineProps({
+  friend: { type: Object as PropType<ImFriend>, required: true },
+})
+
+// websocket
+const websocket = useWebSocket()
+
+onMounted(() => {
+  const userId = useUserStore().user.id
+  const friendId = props.friend.friendId
+
+  websocket.onMessage(async (msg) => {
+    const { from, type, data } = msg
+    // 只处理私聊的
+    if (type === MessageType.PRIVATE) {
+      // 1.自己发的
+      if (userId === from) {
+        messages.value.forEach((item) => {
+          if (item._tempId === data.tempId) {
+            // 更新对象
+            item._status = 'sent'
+            item._tempId = ''
+
+            item.id = data.id
+          }
+        })
+      }
+      // 2.别人发的
+      else {
+        // 2.1 如果当前聊天的正好是这个
+        if (friendId === from) {
+          const newData: ImPrivateMessage = {
+            id: data.id,
+            senderId: data.senderId,
+            receiverId: data.receiverId,
+            content: data.content,
+            sendTime: data.sendTime,
+            type: data.type,
+          }
+
+          messages.value.push(newData)
+          // 更新未读数量，交给外部
+
+          // 等待 DOM 更新再滚动到底部
+          await nextTick()
+          scrollToLatestMessage()
+        }
+        else {
+          // 2.2 如果不是当前这个的话，不做处理
+        }
+      }
+    }
+  })
+})
+
+// 聊天框
+const chatInputRef = ref<HTMLDivElement | null>(null)
+const chatInputValue = ref('')
+const chatSendLoading = ref(false)
+
+const userStore = useUserStore()
+
+// 私聊消息列表
+const messages = ref<ImPrivateMessage[]>([])
+const pagination = ref({
+  pageSize: 10,
+  loading: false,
+  hasMore: true,
+})
+
+const timeMessages = computed(() => processMessagesWithTime(messages.value))
+
+watch(
+  () => props.friend,
+  (newVal) => {
+    if (newVal !== null) {
+      messages.value = []
+      pagination.value = { pageSize: 10, loading: false, hasMore: true }
+      loadMessages('down')
+    }
+  },
+  { immediate: true },
+)
+
+// ref
+const messageListRef = ref()
+const { scrollToBottom: scrollToLatestMessage } = useScrollWatcher({
+  target: messageListRef,
+  onReachTop: () => {
+    let loading = false
+    let hasMore = false
+
+    loading = pagination.value.loading
+    hasMore = pagination.value.hasMore
+
+    if (loading)
+      return
+
+    if (!hasMore) {
+      ElMessage.warning('没有更多消息了')
+    }
+
+    loadMessages('up')
+  },
+})
+
+/**
+ * 处理聊天消息，生成 _showTime 字段
+ * 如果与上一条消息相差超过 5 分钟，则显示时间
+ */
+function processMessagesWithTime(messages: ImPrivateMessage[]) {
+  let lastTimestamp = 0
+
+  return messages.map((msg: ImPrivateMessage) => {
+    if (!msg.sendTime)
+      return { ...msg, _showTime: null }
+
+    const ts = msg.sendTime
+    const showTime = !lastTimestamp || ts - lastTimestamp > 5 * 60 * 1000
+    lastTimestamp = ts
+
+    return { ...msg, _showTime: showTime ? formatImTime(ts, 'chat') : null }
+  })
+}
+
+// 加载私聊消息
+async function loadMessages(direction = 'down') {
+  if (direction === 'up' && !pagination.value.hasMore)
+    return
+
+  pagination.value.loading = true
+
+  const userId = userStore.user.id
+
+  let beforeTimestamp: number | null = null
+  let beforeId: number | null = null
+
+  if (direction === 'up' && messages.value.length > 0) {
+    const firstMsg = messages.value[0]
+    beforeTimestamp = firstMsg.sendTime
+    beforeId = firstMsg.id
+  }
+
+  try {
+    const res = await queryPrivateMessageApi({
+      userId,
+      friendId: props.friend.friendId,
+      pageSize: pagination.value.pageSize,
+      beforeTimestamp,
+      beforeId,
+    })
+
+    if (res.isSuccess) {
+      const records = res.data.reverse()
+
+      if (direction === 'down') {
+        messages.value = records
+        await nextTick()
+        scrollToLatestMessage()
+      }
+      else if (direction === 'up') {
+        if (records.length === 0) {
+          pagination.value.hasMore = false
+          ElMessage.warning('没有更多消息了')
+        }
+        else {
+          messages.value.unshift(...records)
+        }
+      }
+    }
+    else {
+      ElMessage.error(res.message || '加载消息失败，请稍后再试')
+    }
+  }
+  catch (err) {
+    console.error(err)
+    ElMessage.error('加载消息失败，请稍后再试')
+  }
+  finally {
+    pagination.value.loading = false
+  }
+}
+
+// 聊天框输入事件
+function handleChatInputChange(event: Event) {
+  const target = event.target as HTMLElement
+  // 去除首尾空格
+  chatInputValue.value = (target.textContent || '').trim()
+}
+
+// 聊天框回车事件
+function handleChatInputKeyDown(event: KeyboardEvent) {
+  // 判断是否是回车键
+  if (event.key === 'Enter') {
+    event.preventDefault()
+    if (!chatSendLoading.value) {
+      sendMessage()
+    }
+  }
+}
+
+async function sendMessage() {
+  const content = chatInputValue.value?.trim()
+  if (!content) {
+    ElMessage.warning('发送消息不能为空')
+    return
+  }
+
+  const userId = userStore.user.id
+  const _tempId = generateUUID()
+
+  const localMessage: ImPrivateMessage = {
+    id: -Date.now(),
+    senderId: userId,
+    receiverId: props.friend.friendId,
+    content,
+    type: 0,
+    sendTime: Date.now(),
+    _tempId,
+    _status: 'sending',
+  }
+
+  messages.value.push(localMessage)
+
+  // 清空输入框
+  if (chatInputRef.value) {
+    chatInputRef.value.innerHTML = ''
+  }
+
+  const privateData: any = {
+    content,
+    type: 0,
+    tempId: _tempId,
+  }
+
+  websocket.sendPrivate(props.friend.friendId, privateData)
+
+  chatInputValue.value = ''
+  // 等待 DOM 更新再滚动到底部
+  await nextTick()
+  scrollToLatestMessage()
+}
+</script>
+
+<template>
+  <el-splitter layout="vertical">
+    <el-splitter-panel>
+      <div ref="messageListRef" class="im__chat-main">
+        <div v-if="pagination.loading" class="im__chat-message-loading">
+          <SvgIcon icon="svg-spinners:180-ring" color="#1553f1" />
+        </div>
+        <div
+          v-for="item in timeMessages"
+          :key="item.id"
+          class="im__chat-message-wrapper"
+        >
+          <div v-if="item._showTime" class="im__chat-message-time">
+            {{ item._showTime }}
+          </div>
+          <div
+            class="im__chat-message"
+            :class="userStore.user.id === item.senderId
+              ? 'im__chat-message--from'
+              : 'im__chat-message--to'"
+          >
+            <div class="im__chat-message-avatar">
+              <SafeImage :url=" userStore.user.id === item.senderId ? userStore.user.avatar : props.friend.friendAvatar" :size="40" round />
+            </div>
+            <div class="im__chat-message-body">
+              <div class="im__chat-message-name">
+                {{
+                  userStore.user.id === item.senderId ? userStore.user.name : props.friend.friendName
+                }}
+              </div>
+              <div class="im__chat-message-content">
+                <div v-if="item._status && item._status !== 'sent'" class="im__chat-message-status">
+                  <SvgIcon
+                    v-if="item._status === 'sending'"
+                    icon="svg-spinners:180-ring"
+                    color="#1553f1"
+                  />
+                  <SvgIcon
+                    v-else-if="item._status === 'failed'"
+                    icon="material-symbols:error"
+                    color="red"
+                  />
+                </div>
+                <div class="im__chat-message-content--text">
+                  {{ item.content }}
+                </div>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </el-splitter-panel>
+    <el-splitter-panel :min="100" :max="300" :size="150">
+      <div class="im__chat-footer">
+        <div class="im__chat-toolbar">
+          <SvgIcon icon="proicons:emoji" :size="20" />
+
+          <div class="im__chat-toolbar-right">
+            <SvgIcon icon="solar:history-broken" :size="20" />
+          </div>
+        </div>
+        <div class="im__chat-editor">
+          <div
+            ref="chatInputRef"
+            class="im__chat-editor-input"
+            contenteditable="true"
+            data-placeholder="请输入内容..."
+            @input="handleChatInputChange"
+            @keydown="handleChatInputKeyDown"
+          />
+        </div>
+        <div class="im__chat-sendarea">
+          <el-button type="primary" size="small" class="im__chat-send">
+            发送（回车）
+          </el-button>
+        </div>
+      </div>
+    </el-splitter-panel>
+  </el-splitter>
+</template>
+
+<style lang="scss" scoped>
+.im__chat-main {
+  padding: 16px 8px;
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+  width: 100%;
+  scrollbar-gutter: stable both-edges;
+  overflow-y: auto;
+  min-width: 0;
+  background-color: #ffffff;
+  height: 100%;
+  .im__chat-message-loading {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 100%;
+    font-size: 14px;
+  }
+
+  .im__chat-message-wrapper {
+    width: 100%;
+    position: relative;
+  }
+
+  .im__chat-message-time {
+    width: 100%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 14px;
+    color: #666;
+  }
+
+  .im__chat-message {
+    display: flex;
+    width: fit-content;
+    width: 100%;
+    .im__chat-message-avatar {
+      flex-shrink: 0;
+    }
+    .im__chat-message-body {
+      width: 100%;
+      .im__chat-message-name {
+        font-size: 14px;
+        line-height: 1;
+      }
+      .im__chat-message-content {
+        display: inline-flex;
+        align-items: center;
+        margin-top: 8px;
+        max-width: 70%;
+      }
+
+      .im__chat-message-content--text {
+        background-color: #ddd;
+        color: #000000;
+        word-break: break-all;
+        padding: 6px 12px;
+        border-radius: 4px;
+        text-align: left;
+      }
+    }
+  }
+  .im__chat-message--from {
+    align-self: flex-end;
+    flex-direction: row-reverse;
+    .im__chat-message-body {
+      margin-right: 8px;
+      text-align: right;
+      .im__chat-message-content--text {
+        background-color: #3c73ff;
+        color: #fff;
+      }
+      .im__chat-message-name {
+        text-align: right;
+      }
+
+      .im__chat-message-status {
+        margin-right: 8px;
+      }
+    }
+  }
+  .im__chat-message--to {
+    text-align: left;
+    align-items: flex-start;
+    .im__chat-message-body {
+      margin-left: 8px;
+      .im__chat-message-status {
+        margin-left: 8px;
+      }
+    }
+  }
+}
+
+.im__chat-group {
+  width: 300px;
+  border-left: 1px solid #e6e9ef;
+  min-height: 0;
+  display: flex;
+  flex-direction: column;
+  flex-shrink: 0;
+
+  .im__group-section-header {
+    height: 46px;
+    border-bottom: 1px solid #e6e9ef;
+    display: flex;
+    align-items: center;
+    padding: 0px 8px;
+    justify-content: space-between;
+    .im__group-section-header-title {
+      display: flex;
+      align-items: center;
+    }
+    .im__group-section-header-text {
+      margin-left: 4px;
+      line-height: 1;
+      font-size: 14px;
+    }
+
+    .im__group-section-header--search {
+      cursor: pointer;
+      color: #666666;
+      &:hover {
+        color: #1553f1 !important;
+      }
+    }
+  }
+
+  .im__group-section-body {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    overflow-y: auto;
+    min-height: 0;
+
+    .im__group-item {
+      height: 64px;
+      padding: 0 10px;
+      display: flex;
+      align-items: center;
+      cursor: pointer;
+      flex-shrink: 0;
+      &:hover {
+        background-color: #f5f7fa;
+      }
+
+      .im__group-item-info {
+        margin-left: 8px;
+        .im__group-item-name {
+          line-height: 1;
+          font-size: 14px;
+        }
+        .im__group-item-desc {
+          margin-top: 8px;
+          font-size: 12px;
+          color: #666;
+        }
+      }
+    }
+  }
+}
+
+.im__chat-footer {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  width: 100%;
+  height: 100%;
+
+  .im__chat-toolbar {
+    height: 36px;
+    flex-shrink: 0;
+    display: flex;
+    align-items: center;
+    padding: 0px 8px;
+    gap: 8px;
+    .im__chat-toolbar-right {
+      margin-left: auto;
+    }
+  }
+
+  .im__chat-editor {
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+    overflow-y: auto;
+    flex: 1;
+    min-height: 0;
+    width: 100%;
+    scrollbar-gutter: stable both-edges;
+
+    .im__chat-editor-input {
+      padding: 4px;
+      flex: 1;
+      // overflow-y: auto;
+      box-sizing: border-box;
+      border: none;
+      resize: none;
+      background-color: transparent;
+      outline: none;
+
+      word-wrap: break-word;
+      word-break: break-all;
+      white-space: pre-wrap;
+
+      -webkit-user-select: text;
+      -moz-user-select: text;
+      user-select: text;
+      cursor: text;
+    }
+    .im__chat-editor-input:empty::before {
+      content: attr(data-placeholder);
+      color: #aaa;
+      pointer-events: none;
+      display: block;
+    }
+  }
+
+  .im__chat-sendarea {
+    height: 36px;
+    flex-shrink: 0;
+    display: flex;
+    align-items: center;
+    margin-left: auto;
+    padding: 0px 16px;
+    .im__chat-send {
+      background-color: #1553f1;
+    }
+  }
+}
+</style>
diff --git a/code/link56/link56-frontend-new/src/views/im/index.vue b/code/link56/link56-frontend-new/src/views/im/index.vue
index 0d47c49f..632d0e06 100644
--- a/code/link56/link56-frontend-new/src/views/im/index.vue
+++ b/code/link56/link56-frontend-new/src/views/im/index.vue
@@ -1,55 +1,38 @@
 <script lang="ts" setup>
 import type { ImFriend, ImGroup } from '@/types/im'
 import { Search } from '@element-plus/icons-vue'
-import { computed, onMounted, ref, watch } from 'vue'
+import { computed, onMounted, ref } from 'vue'
 import { useRoute } from 'vue-router'
-import { queryFriendApi, queryGroupApi } from '@/request/api/im'
+import { queryFriendApi, queryGroupApi, updateGroupUnreadApi, updatePrivateUnreadApi } from '@/request/api/im'
+import { useUserStore } from '@/store/user'
 import { useWebSocket } from '@/store/websocket'
 import { MessageType } from '@/types/im'
 import { formatImTime } from '@/utils/time'
 
+import GroupChatWindows from './components/GroupChatWindows.vue'
+import PrivateChatWindow from './components/PrivateChatWindow.vue'
+
+const userStore = useUserStore()
 const route = useRoute()
 const websocket = useWebSocket()
-
 // 当前聊天对象
 const searchName = ref('')
 
-type ChatType = 'private' | 'group'
+type ChatType = 'private' | 'group' | ''
 
-const initialChat = ref<{
+const selectedChat = ref<{
   type: ChatType
-  id: number
-} | null>(null)
+  id: number | null
+}>({
+  type: 'group',
+  id: null,
+})
 
-type CurrentChat
-  = | {
-    type: 'private'
-    id: number
-    data?: ImFriend
-  }
-  | {
-    type: 'group'
-    id: number
-    data?: ImGroup
-  }
+const currentFriendChat = ref<ImFriend | null>(null)
+const currentGroupChat = ref<ImGroup | null>(null)
 
-const currentChat = ref<CurrentChat | null>(null)
-
-watch(
-  () => initialChat.value,
-  (chat) => {
-    if (!chat)
-      return
-
-    currentChat.value = {
-      type: chat.type,
-      id: chat.id,
-    }
-
-    initialChat.value = null
-  },
-  { immediate: true },
-)
+const isGroupChat = computed(() => selectedChat.value.type === 'group')
+const isPrivateChat = computed(() => selectedChat.value.type === 'private')
 
 // 聊天列表
 interface ImListState<T> {
@@ -70,6 +53,7 @@ const friendState = ref<ImListState<ImFriend>>({
   loading: false,
   hasMore: true,
 })
+
 // 群组列表
 const groupState = ref<ImListState<ImGroup>>({
   list: [],
@@ -82,18 +66,20 @@ const groupState = ref<ImListState<ImGroup>>({
 
 // 初始化
 onMounted(() => {
+  const userId = userStore.user.id
+
   const type = route.params.type as ChatType | undefined
   const id = route.params.id ? Number(route.params.id) : null
 
   if (type && id) {
-    initialChat.value = { type, id }
+    selectedChat.value = { type, id }
   }
 
   loadGroups()
   loadFriends()
 
   websocket.onMessage((msg) => {
-    const { type, from } = msg
+    const { type, from, data } = msg
 
     // 更新在线状态
     const updateOnlineStatus = (isOnline: boolean) => {
@@ -108,6 +94,56 @@ onMounted(() => {
     else if (type === MessageType.OFFLINE) {
       updateOnlineStatus(false)
     }
+    else if (type === MessageType.FRIEND_UPDATE) {
+      const updatedFriend = data as ImFriend
+
+      // 检查是否已经存在
+      const exists = friendState.value.list.some(
+        item => item.friendId === updatedFriend.friendId,
+      )
+
+      // 如果不存在，放到第一个
+      if (!exists) {
+        friendState.value.list.unshift(updatedFriend)
+        friendState.value.total += 1
+      }
+    }
+    else if (type === MessageType.PRIVATE) {
+      const chatFriendId = currentFriendChat.value?.friendId
+      const { senderId, receiverId, type: contentType, content, sendTime } = data
+
+      // 遍历好友列表更新最近消息和未读
+      friendState.value.list.forEach((item) => {
+        if (item.friendId === senderId || item.friendId === receiverId) {
+          // 更新最近消息
+          item.lastMessageTime = sendTime
+          item.lastMessageContent = content
+          item.lastMessageType = contentType
+
+          // 如果是别人发的消息并且不是当前聊天好友，增加未读
+          if (userId !== senderId && senderId !== chatFriendId && item.friendId === senderId) {
+            item.unreadCount = (item.unreadCount || 0) + 1
+          }
+        }
+      })
+
+      // 更新当前聊天对象最近消息
+      if (currentFriendChat.value && (senderId === chatFriendId || receiverId === chatFriendId)) {
+        currentFriendChat.value.lastMessageTime = sendTime
+        currentFriendChat.value.lastMessageContent = content
+        currentFriendChat.value.lastMessageType = contentType
+
+        // 重置未读数量，如果是别人发的消息且当前聊天窗口打开
+        if (userId !== senderId) {
+          currentFriendChat.value.unreadCount = 0
+          // 调用接口同步重置
+          updatePrivateUnreadApi({
+            userId,
+            friendId: chatFriendId!,
+          })
+        }
+      }
+    }
   })
 })
 
@@ -123,7 +159,7 @@ async function loadFriends() {
       currentPage: state.page,
       pageSize: state.pageSize,
       name: searchName.value,
-      id: currentChat.value?.type === 'private' ? currentChat.value.id : null,
+      id: isPrivateChat.value ? (selectedChat.value?.id ?? null) : null,
     })
 
     if (!res.isSuccess)
@@ -139,6 +175,8 @@ async function loadFriends() {
     state.total = total
     state.hasMore = state.list.length < total
     state.page++
+
+    selectedChat.value.id = null
   }
   catch (e) {
     console.error(e)
@@ -160,7 +198,7 @@ async function loadGroups() {
       currentPage: state.page,
       pageSize: state.pageSize,
       name: searchName.value,
-      id: currentChat.value?.type === 'group' ? currentChat.value.id : null,
+      id: isGroupChat.value ? (selectedChat.value?.id ?? null) : null,
     })
 
     if (!res.isSuccess)
@@ -176,6 +214,8 @@ async function loadGroups() {
     state.total = total
     state.hasMore = state.list.length < total
     state.page++
+
+    selectedChat.value.id = null
   }
   catch (e) {
     console.error(e)
@@ -201,29 +241,54 @@ function handleSearch() {
 }
 
 function onPrivateChat(friend: ImFriend) {
+  currentGroupChat.value = null
+
+  const userId = userStore.user.id
   // 将 friend 的未读置0
   const hadUnread = friend.unreadCount > 0
   friend.unreadCount = 0
+
   // 设置当前聊天
-  currentChat.value = {
-    id: friend.friendId,
+  selectedChat.value = {
     type: 'private',
-    data: friend,
+    id: friend.friendId,
+  }
+
+  currentFriendChat.value = friend
+
+  if (hadUnread) {
+    updatePrivateUnreadApi({
+      userId,
+      friendId: friend.friendId,
+    })
   }
-  // 初始化分页
 }
 
 function onGroupChat(group: ImGroup) {
-  // 将 friend 的未读置0
+  currentFriendChat.value = null
+
+  const userId = userStore.user.id
+
+  // 将 group 的未读置0
   const hadUnread = group.unreadCount > 0
   group.unreadCount = 0
+
   // 设置当前聊天
-  currentChat.value = {
-    id: group.groupId,
+  selectedChat.value = {
     type: 'group',
-    data: group,
+    id: group.groupId,
   }
-  // 初始化分页
+
+  currentGroupChat.value = group
+  if (hadUnread) {
+    updateGroupUnreadApi({
+      groupId: group.groupId,
+      userId,
+    })
+  }
+
+  console.log(isGroupChat.value)
+  console.log(currentGroupChat.value)
 }
 </script>
 
@@ -280,7 +345,7 @@ function onGroupChat(group: ImGroup) {
                 v-for="item in friendState.list" :key="item.id" class="im__chat-item"
                 :class="{
                   'im__chat-item--selected':
-                    currentChat?.type === 'private' && item.friendId === currentChat.id,
+                    isPrivateChat && item.friendId === currentFriendChat?.friendId,
                 }"
                 @click="onPrivateChat(item)"
               >
@@ -324,7 +389,14 @@ function onGroupChat(group: ImGroup) {
             </div>
             <div class="im__list-body">
               <div
-                v-for="item in groupState.list" :key="item.groupId" class="im__chat-item"
+                v-for="item in groupState.list"
+                :key="item.groupId"
+                class="im__chat-item"
+                :class="{
+                  'im__chat-item--selected':
+                    isGroupChat && item.groupId === currentGroupChat?.groupId,
+                }"
+                @click="onGroupChat(item)"
               >
                 <SafeImage :size="40" :url="item.groupAvatar" round class="im__chat-item-avatar" />
 
@@ -340,9 +412,8 @@ function onGroupChat(group: ImGroup) {
 
                   <div class="im__chat-item-message">
                     <div v-if="item.lastMessageId" class="im__chat-item-last-message">
-                      <!-- {{ item. }}: {{ item.lastMessageContent }} -->
+                      {{ item.lastMessageSenderName }}：{{ item.lastMessageContent }}
                     </div>
-
                     <el-badge :value="item.unreadCount || 0" :show-zero="false" :max="99" class="im__chat-item-unread-count" />
                   </div>
                 </div>
@@ -351,21 +422,21 @@ function onGroupChat(group: ImGroup) {
           </div>
         </div>
 
-        <div v-if="currentChat" class="im__window">
+        <div class="im__window">
           <div class="im__window-header">
             <div class="im__window-peer">
               <div class="im__window-peer-info">
                 <div class="im__window-peer-name">
-                  {{ currentChat.type === 'private' ? currentChat.data?.friendName : currentChat.data?.groupName }}
+                  {{ isPrivateChat ? currentFriendChat?.friendName : currentGroupChat?.groupName }}
                 </div>
-                <div v-if="currentChat.type === 'private'" class="im__window-peer-desc">
+                <div v-if="isPrivateChat" class="im__window-peer-desc">
                   <div
                     class="im__window-peer-status"
-                    :class="currentChat.data?.isOnline ? 'im__window-peer-status--online' : 'im__window-peer-status--offline'"
+                    :class="currentFriendChat?.isOnline ? 'im__window-peer-status--online' : 'im__window-peer-status--offline'"
                   >
                     <span>[ </span>
                     <div class="im__window-peer-status-dot" />
-                    <span>{{ currentChat.data?.isOnline ? '在线' : '离线' }}</span>
+                    <span>{{ currentFriendChat?.isOnline ? '在线' : '离线' }}</span>
                     <span> ]</span>
                   </div>
                   <span>
@@ -376,6 +447,11 @@ function onGroupChat(group: ImGroup) {
             </div>
             <div class="im__window-actions" />
           </div>
+
+          <div class="im__window-body">
+            <PrivateChatWindow v-if="isPrivateChat && currentFriendChat != null" :friend="currentFriendChat" />
+            <GroupChatWindows v-if="isGroupChat && currentGroupChat != null" :group="currentGroupChat" />
+          </div>
         </div>
       </div>
     </div>
@@ -583,7 +659,7 @@ function onGroupChat(group: ImGroup) {
             }
 
             .im__chat-item-name {
-              font-size: 16px;
+              font-size: 14px;
               font-weight: 500;
             }
             .im__chat-item-last-time,
@@ -707,7 +783,7 @@ function onGroupChat(group: ImGroup) {
         scrollbar-gutter: stable both-edges;
         overflow-y: auto;
         min-width: 0;
-        background-color: #f8fafc;
+        background-color: #ffffff;
         height: 100%;
         .im__chat-message-loading {
           display: flex;
@@ -908,6 +984,12 @@ function onGroupChat(group: ImGroup) {
             user-select: text;
             cursor: text;
           }
+          .im__chat-editor-input:empty::before {
+            content: attr(data-placeholder);
+            color: #aaa;
+            pointer-events: none;
+            display: block;
+          }
         }
 
         .im__chat-sendarea {
diff --git a/code/link56/link56-frontend-new/test.html b/code/link56/link56-frontend-new/test.html
index 41cbccd7..3f495a21 100644
--- a/code/link56/link56-frontend-new/test.html
+++ b/code/link56/link56-frontend-new/test.html
@@ -1,118 +1,246 @@
-<!DOCTYPE html>
-<html lang="zh-CN">
-
-<head>
+<!doctype html>
+<html lang="en">
+  <head>
     <meta charset="UTF-8" />
-    <title>公司信息卡片</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>私聊界面示例</title>
     <style>
-        * {
-            box-sizing: border-box;
-        }
+      body {
+        font-family: Arial, sans-serif;
+        margin: 0;
+        padding: 0;
+        background-color: #f5f5f5;
+        height: 100vh;
+        display: flex;
+      }
 
-        body {
-            margin: 0;
-            padding: 40px;
-            background-color: #ffffff;
-            /* 页面白色背景 */
-            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
-                "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
-            color: #333;
-        }
+      /* 左侧聊天列表 */
+      .chat-list {
+        width: 280px;
+        background-color: #fff;
+        border-right: 1px solid #ddd;
+        overflow-y: auto;
+        display: flex;
+        flex-direction: column;
+      }
 
-        .company-card {
-            display: flex;
-            align-items: flex-start;
-            max-width: 520px;
-            background-color: #fff;
-            /* 卡片白色背景 */
-            padding: 20px;
-            margin: 0 auto;
-            border-radius: 12px;
-            border: 1px solid #ddd;
-            transition: all 0.2s ease;
-        }
+      .chat-list .user-card {
+        display: flex;
+        align-items: center;
+        padding: 12px 16px;
+        cursor: pointer;
+        transition: background-color 0.2s;
+        border-bottom: 1px solid #f0f0f0;
+      }
 
-        .company-card:hover {
-            transform: translateY(-2px);
-            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
-        }
+      .chat-list .user-card:hover,
+      .chat-list .user-card.active {
+        background-color: #f0f8ff;
+      }
 
-        .company-logo {
-            width: 72px;
-            height: 72px;
-            border-radius: 10px;
-            object-fit: cover;
-            margin-right: 16px;
-            border: 1px solid #eee;
-        }
+      .chat-list .avatar {
+        width: 40px;
+        height: 40px;
+        border-radius: 50%;
+        margin-right: 12px;
+        object-fit: cover;
+        border: 2px solid #4caf50;
+        /* 默认在线状态绿色 */
+      }
 
-        .company-info {
-            flex: 1;
-        }
+      .chat-list .user-info {
+        flex: 1;
+      }
 
-        .company-name {
-            margin: 0;
-            font-size: 18px;
-            font-weight: 600;
-            color: #222;
-        }
+      .chat-list .user-name {
+        margin: 0;
+        font-size: 14px;
+        font-weight: bold;
+      }
 
-        .company-meta {
-            margin: 6px 0 10px;
-            font-size: 13px;
-            color: #888;
-        }
+      .chat-list .user-position {
+        margin: 2px 0 0 0;
+        font-size: 12px;
+        color: #666;
+      }
 
-        .company-desc {
-            font-size: 14px;
-            line-height: 1.6;
-            color: #555;
-            margin-bottom: 12px;
-        }
+      .chat-list .status {
+        width: 10px;
+        height: 10px;
+        border-radius: 50%;
+        background-color: #4caf50;
+      }
 
-        .company-tags {
-            display: flex;
-            flex-wrap: wrap;
-            gap: 8px;
-        }
+      .chat-list .offline {
+        background-color: #ccc;
+      }
 
-        .tag {
-            font-size: 12px;
-            padding: 4px 10px;
-            border-radius: 6px;
-            background-color: #eef5ff;
-            color: #3a7afe;
-            white-space: nowrap;
-        }
+      /* 右侧聊天详情 */
+      .chat-detail {
+        flex: 1;
+        display: flex;
+        flex-direction: column;
+        background-color: #f9f9f9;
+      }
+
+      .chat-header {
+        display: flex;
+        align-items: center;
+        padding: 12px 16px;
+        background-color: #fff;
+        border-bottom: 1px solid #ddd;
+      }
+
+      .chat-header .avatar {
+        width: 50px;
+        height: 50px;
+        border-radius: 50%;
+        margin-right: 12px;
+        border: 2px solid #4caf50;
+      }
+
+      .chat-header .info {
+        flex: 1;
+      }
+
+      .chat-header .info .name {
+        font-size: 16px;
+        font-weight: bold;
+        margin: 0;
+      }
+
+      .chat-header .info .position {
+        font-size: 12px;
+        color: #666;
+        margin: 2px 0;
+      }
+
+      .chat-header .info .company-info {
+        font-size: 12px;
+        color: #999;
+        display: flex;
+        align-items: center;
+      }
+
+      .chat-header .info .company-logo {
+        width: 16px;
+        height: 16px;
+        margin-right: 4px;
+        border-radius: 2px;
+        object-fit: cover;
+      }
+
+      .messages {
+        flex: 1;
+        padding: 16px;
+        overflow-y: auto;
+      }
+
+      .message {
+        margin-bottom: 12px;
+        max-width: 70%;
+        padding: 8px 12px;
+        border-radius: 12px;
+        background-color: #fff;
+        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
+      }
+
+      .message.self {
+        background-color: #dcf8c6;
+        margin-left: auto;
+      }
+
+      .message.other {
+        background-color: #fff;
+        margin-right: auto;
+      }
+
+      .chat-input {
+        padding: 12px 16px;
+        border-top: 1px solid #ddd;
+        background-color: #fff;
+        display: flex;
+        gap: 8px;
+      }
+
+      .chat-input input {
+        flex: 1;
+        padding: 8px 12px;
+        border: 1px solid #ccc;
+        border-radius: 20px;
+        outline: none;
+      }
+
+      .chat-input button {
+        padding: 8px 16px;
+        border: none;
+        background-color: #4caf50;
+        color: #fff;
+        border-radius: 20px;
+        cursor: pointer;
+      }
     </style>
-</head>
+  </head>
 
-<body>
-
-    <div class="company-card">
-        <img class="company-logo" src="https://via.placeholder.com/150" alt="公司 Logo" />
-
-        <div class="company-info">
-            <h3 class="company-name">远航国际物流有限公司</h3>
-
-            <div class="company-meta">
-                成立于 2012 年 · 上海
-            </div>
-
-            <div class="company-desc">
-                专注于海运、空运及多式联运服务，为客户提供高效、稳定、
-                可视化的国际物流解决方案，覆盖全球主要港口。
-            </div>
-
-            <div class="company-tags">
-                <span class="tag">海运</span>
-                <span class="tag">国际物流</span>
-                <span class="tag">货运代理</span>
-                <span class="tag">跨境贸易</span>
-            </div>
+  <body>
+    <!-- 左侧聊天列表 -->
+    <div class="chat-list">
+      <div class="user-card active">
+        <img class="avatar" src="https://i.pravatar.cc/40?img=1" alt="头像" />
+        <div class="user-info">
+          <p class="user-name">张三</p>
+          <p class="user-position">前端工程师</p>
         </div>
+        <div class="status"></div>
+      </div>
+
+      <div class="user-card">
+        <img class="avatar" src="https://i.pravatar.cc/40?img=2" alt="头像" />
+        <div class="user-info">
+          <p class="user-name">李四</p>
+          <p class="user-position">产品经理</p>
+        </div>
+        <div class="status offline"></div>
+      </div>
+
+      <div class="user-card">
+        <img class="avatar" src="https://i.pravatar.cc/40?img=3" alt="头像" />
+        <div class="user-info">
+          <p class="user-name">王五</p>
+          <p class="user-position">设计师</p>
+        </div>
+        <div class="status"></div>
+      </div>
     </div>
 
-</body>
+    <!-- 右侧聊天详情 -->
+    <div class="chat-detail">
+      <!-- 聊天头部 -->
+      <div class="chat-header">
+        <img class="avatar" src="https://i.pravatar.cc/50?img=1" alt="头像" />
+        <div class="info">
+          <p class="name">张三</p>
+          <p class="position">前端工程师</p>
+          <div class="company-info">
+            <img class="company-logo" src="https://via.placeholder.com/16" alt="公司logo" />
+            <span>ABC科技公司</span>
+          </div>
+        </div>
+      </div>
 
-</html>
\ No newline at end of file
+      <!-- 消息区域 -->
+      <div class="messages">
+        <div class="message other">你好！这是张三的消息。</div>
+        <div class="message self">你好，我是自己发的消息。</div>
+        <div class="message other">我们下午开会吗？</div>
+        <div class="message self">好的，下午三点。</div>
+      </div>
+
+      <!-- 输入框 -->
+      <div class="chat-input">
+        <input type="text" placeholder="输入消息..." />
+        <button>发送</button>
+      </div>
+    </div>
+  </body>
+</html>