添加web依赖,在controller中接收和处理请求

pom.xml

@@ -22,7 +22,10 @@
             <artifactId>mybatis-spring-boot-starter</artifactId>
             <version>2.3.1</version>
         </dependency>
-
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.mysql</groupId>
             <artifactId>mysql-connector-j</artifactId>
@@ -39,6 +42,7 @@
             <version>2.3.1</version>
             <scope>test</scope>
         </dependency>
+
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>

src/main/java/com/example/mybatisdemo/controller/UserController.java

@@ -0,0 +1,54 @@
+package com.example.mybatisdemo.controller;
+
+import com.example.mybatisdemo.mapper.UserMapper;
+import com.example.mybatisdemo.pojo.dto.UserDTO;
+import com.example.mybatisdemo.pojo.entity.User;
+import com.example.mybatisdemo.pojo.vo.UserVO;
+import org.springframework.beans.BeanUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+
+@RestController
+public class UserController {
+
+    @Autowired
+    private UserMapper userMapper;
+
+    @PostMapping("/addUser")
+    public String addUser(@RequestBody UserDTO userDTO){
+        User user = new User();
+        BeanUtils.copyProperties(userDTO,user);
+        int insert = userMapper.insert(user);
+        if (insert!=0){
+            return "添加成功";
+        }
+        return "添加失败";
+    }
+
+    @GetMapping("/selectUser/{id}")
+    public UserVO selectUser(@PathVariable int id){
+        UserVO userVO = userMapper.selectById(id);
+        return userVO;
+    }
+
+
+    @PostMapping("/update")
+    public String updateUser(@RequestBody UserDTO userDTO){
+        int i = userMapper.updateById(userDTO);
+        if (i!=0){
+            return "修改成功";
+        }
+        return "修改失败";
+    }
+
+
+    @GetMapping("delete/{id}")
+    public String deleteUser(@PathVariable int id){
+        int i = userMapper.deleteById(id);
+        if (i!=0){
+            return "删除成功";
+        }
+        return "删除失败";
+    }
+}