diff --git a/src/main/java/jty/expressdistributionsystem/controller/AdminController.java b/src/main/java/jty/expressdistributionsystem/controller/AdminController.java
new file mode 100644
index 0000000..000bbfb
--- /dev/null
+++ b/src/main/java/jty/expressdistributionsystem/controller/AdminController.java
@@ -0,0 +1,37 @@
+package jty.expressdistributionsystem.controller;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import jakarta.annotation.Resource;
+import jty.expressdistributionsystem.entity.Result;
+import jty.expressdistributionsystem.entity.User;
+import jty.expressdistributionsystem.service.UserService;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/admin")
+public class AdminController {
+    @Resource
+    private UserService userService;
+
+    // 管理员查看用户信息
+    @GetMapping("/userList")
+    public Result<Page<User>> getUserList(@RequestParam int page, @RequestParam int pageSize){
+        if(page <= 0 || pageSize <= 0) {
+            return new Result<>(400, "页码和每页大小必须大于0", null);
+        }
+        // 分页
+        Page<User> pageInfo = new Page<>(page, pageSize);
+        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
+        // 添加查询条件
+        queryWrapper.eq(User::getMark, 0);
+        // 排序
+        queryWrapper.orderByDesc(User::getLoginTime)
+                .orderByDesc(User::getCreateTime);
+        userService.page(pageInfo, queryWrapper);
+        return new Result<>(200, "", pageInfo);
+    }
+}
diff --git a/src/main/java/jty/expressdistributionsystem/controller/UserController.java b/src/main/java/jty/expressdistributionsystem/controller/UserController.java
index 7d6952e..7e74468 100644
--- a/src/main/java/jty/expressdistributionsystem/controller/UserController.java
+++ b/src/main/java/jty/expressdistributionsystem/controller/UserController.java
@@ -9,7 +9,7 @@ import jty.expressdistributionsystem.DTO.UserModifyPassword;
 import jty.expressdistributionsystem.config.MyMetaObjectHandler;
 import jty.expressdistributionsystem.entity.Result;
 import jty.expressdistributionsystem.entity.User;
-import jty.expressdistributionsystem.mapper.UserMapper;
+import jty.expressdistributionsystem.service.UserService;
 import jty.expressdistributionsystem.utils.GetIdUtil;
 import jty.expressdistributionsystem.utils.JwtUtil;
 import jty.expressdistributionsystem.utils.Md5Util;
@@ -30,7 +30,7 @@ import java.util.concurrent.TimeUnit;
 @RequestMapping("/user")
 public class UserController {
     @Resource
-    private UserMapper userMapper;
+    private UserService userService;
 
     @Resource
     private StringRedisTemplate stringRedisTemplate;
@@ -43,14 +43,14 @@ public class UserController {
         queryWrapper.eq("user_name", user.getUserName())
                 .or()
                 .eq("account", user.getAccount());
-        User u = userMapper.selectOne(queryWrapper);
+        User u = userService.getOne(queryWrapper);
         if (u != null) {
             return new Result<>(409, "用户已存在", "");
         }
         // 密码加密
         user.setPassword(Md5Util.getMD5String(user.getPassword()));
         // 用户数据入库
-        userMapper.insert(user);
+        userService.save(user);
         return new Result<>(200, "注册成功", "");
     }
 
@@ -58,7 +58,7 @@ public class UserController {
     @PostMapping("/loginByAccount")
     public Result<String> login(@RequestBody @Validated @NotNull UserLoginByAccountDTO userLoginByAccountDTO) {
         // 查询用户是否存在
-        Optional<User> optionalUser = Optional.ofNullable(userMapper.selectOne(new QueryWrapper<User>()
+        Optional<User> optionalUser = Optional.ofNullable(userService.getOne(new QueryWrapper<User>()
                 .eq("account", userLoginByAccountDTO.getAccount())));
         if (optionalUser.isEmpty() || !Md5Util.getMD5String(userLoginByAccountDTO.getPassword()).equals(optionalUser.get().getPassword())) {
             return new Result<>(401, "账号或者密码错误", "");
@@ -70,7 +70,7 @@ public class UserController {
         // 禁用自动填充
         MyMetaObjectHandler.setSkipUpdateFill(true);
         user.setLoginTime(LocalDateTime.now());
-        userMapper.update(user, new UpdateWrapper<User>().eq("id", user.getId()));
+        userService.update(user, new UpdateWrapper<User>().eq("id", user.getId()));
         // 校验通过
         Map<String, Object> claims = new HashMap<>();
         claims.put("id", user.getId());
@@ -92,7 +92,7 @@ public class UserController {
     public Result<Object> modifyMessage(@RequestBody @Validated @NotNull UserModifyMessageDTO userModifyMessageDTO) {
         // 获取登录用户id
         Long id = GetIdUtil.getId();
-        User user = userMapper.selectById(id);
+        User user = userService.getById(id);
         // 检查phone和userName是否与当前用户信息一致
         boolean isPhoneSame = user.getPhone().equals(userModifyMessageDTO.getPhone());
         boolean isUserNameSame = user.getUserName().equals(userModifyMessageDTO.getUserName());
@@ -102,7 +102,7 @@ public class UserController {
         QueryWrapper<User> queryWrapper = new QueryWrapper<>();
         if (!isPhoneSame) {
             queryWrapper.eq("phone", userModifyMessageDTO.getPhone());
-            if (userMapper.selectOne(queryWrapper) != null) {
+            if (userService.getOne(queryWrapper) != null) {
                 return new Result<>(400, "该手机号已被注册", "");
             }
             user.setPhone(userModifyMessageDTO.getPhone());
@@ -110,12 +110,12 @@ public class UserController {
         queryWrapper.clear();
         if (!isUserNameSame) {
             queryWrapper.eq("user_name", userModifyMessageDTO.getUserName());
-            if (userMapper.selectOne(queryWrapper) != null) {
+            if (userService.getOne(queryWrapper) != null) {
                 return new Result<>(400, "该用户名已被使用", "");
             }
             user.setUserName(userModifyMessageDTO.getUserName());
         }
-        userMapper.updateById(user);
+        userService.updateById(user);
         return new Result<>(200, "用户信息修改成功", user);
     }
 
@@ -131,12 +131,12 @@ public class UserController {
             return new Result<>(409, "两次输入密码不相同", "");
         }
         Long id = GetIdUtil.getId();
-        User user = userMapper.selectById(id);
+        User user = userService.getById(id);
         if (!user.getIdentity().equals(userModifyPassword.getIdentity())) {
             return new Result<>(409, "请输入您的身份证", "");
         }
         user.setPassword(Md5Util.getMD5String(userModifyPassword.getNewPassword()));
-        userMapper.updateById(user);
+        userService.updateById(user);
         // 删除redis当中的token
         stringRedisTemplate.delete(token);
         // 删除当前线程的存储信息
@@ -148,7 +148,7 @@ public class UserController {
     @GetMapping("/info")
     public Result<User> getInfo() {
         Long id = GetIdUtil.getId();
-        User user = userMapper.selectById(id);
+        User user = userService.getById(id);
         return new Result<>(200, "", user);
     }
 }
diff --git a/src/main/java/jty/expressdistributionsystem/entity/Message.java b/src/main/java/jty/expressdistributionsystem/entity/Message.java
new file mode 100644
index 0000000..63885f3
--- /dev/null
+++ b/src/main/java/jty/expressdistributionsystem/entity/Message.java
@@ -0,0 +1,37 @@
+package jty.expressdistributionsystem.entity;
+
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import lombok.Data;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.Serial;
+import java.io.Serializable;
+
+@Data
+public class Message implements Serializable {
+    @Serial
+    private static final long serialVersionUID = 1L;
+
+    @TableId("id")
+    @JsonSerialize(using = ToStringSerializer.class)
+    private Long id;
+
+    @TableField("content")
+    private String content;
+
+    @TableField("send_user_id")
+    @NotNull
+    @JsonSerialize(using = ToStringSerializer.class)
+    private Long sendUserId;
+
+    @TableField("get_user_id")
+    @NotNull
+    @JsonSerialize(using = ToStringSerializer.class)
+    private Long getUserId;
+
+    @TableField("mark")
+    private Integer mark;
+}