first commit

src/main/java/com/yundage/chat/controller/UserController.java

@@ -0,0 +1,48 @@
+package com.yundage.chat.controller;
+
+import com.yundage.chat.entity.User;
+import com.yundage.chat.mapper.UserMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/users")
+public class UserController {
+    
+    @Autowired
+    private UserMapper userMapper;
+    
+    @GetMapping
+    public List<User> getAllUsers() {
+        return userMapper.selectAll();
+    }
+    
+    @GetMapping("/{id}")
+    public User getUserById(@PathVariable Long id) {
+        return userMapper.selectOneById(id);
+    }
+    
+    @PostMapping
+    public User createUser(@RequestBody User user) {
+        user.setCreateTime(LocalDateTime.now());
+        user.setUpdateTime(LocalDateTime.now());
+        userMapper.insert(user);
+        return user;
+    }
+    
+    @PutMapping("/{id}")
+    public User updateUser(@PathVariable Long id, @RequestBody User user) {
+        user.setId(id);
+        user.setUpdateTime(LocalDateTime.now());
+        userMapper.update(user);
+        return user;
+    }
+    
+    @DeleteMapping("/{id}")
+    public void deleteUser(@PathVariable Long id) {
+        userMapper.deleteById(id);
+    }
+}