修改登录逻辑，配合前后端联调

src/main/java/com/rj/controller/sys/UserController.java

@@ -2,7 +2,10 @@ package com.rj.controller.sys;
 
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.rj.common.PasswordUtil;
 import com.rj.entity.sys.User;
+import com.rj.pojo.sys.LoginRequest;
+import com.rj.pojo.sys.LoginResponse;
 import com.rj.service.sys.IUserService;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
@@ -11,6 +14,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
+import jakarta.validation.Valid;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -31,6 +35,28 @@ public class UserController {
     @Autowired
     private IUserService userService;
 
+    /**
+     * 用户登录
+     */
+    @PostMapping("/login")
+    @Operation(summary = "用户登录", description = "根据用户名和密码进行登录验证")
+    public ResponseEntity<Map<String, Object>> login(
+            @Parameter(description = "登录信息", required = true)
+            @Valid @RequestBody LoginRequest loginRequest) {
+        Map<String, Object> result = new HashMap<>();
+        try {
+            LoginResponse loginResponse = userService.login(loginRequest);
+            result.put("success", true);
+            result.put("message", "登录成功");
+            result.put("data", loginResponse);
+            return ResponseEntity.ok(result);
+        } catch (Exception e) {
+            result.put("success", false);
+            result.put("message", "登录失败：" + e.getMessage());
+            return ResponseEntity.badRequest().body(result);
+        }
+    }
+
     /**
      * 新增用户
      */
@@ -41,6 +67,23 @@ public class UserController {
             @RequestBody User user) {
         Map<String, Object> result = new HashMap<>();
         try {
+            // 检查用户名是否已存在
+            User existingUser = userService.getUserByUserName(user.getUserName());
+            if (existingUser != null) {
+                result.put("success", false);
+                result.put("message", "用户名已存在");
+                return ResponseEntity.badRequest().body(result);
+            }
+            
+            // 保存原始密码并加密
+            if (user.getPassword() != null && !user.getPassword().trim().isEmpty()) {
+                // 保存原始密码
+                user.setOriginalPassword(user.getPassword());
+                // 对密码进行加密
+                String encryptedPassword = PasswordUtil.encryptPasswordWithDefaultSalt(user.getPassword());
+                user.setPassword(encryptedPassword);
+            }
+            
             boolean success = userService.save(user);
             if (success) {
                 result.put("success", true);
@@ -176,6 +219,23 @@ public class UserController {
                 return ResponseEntity.badRequest().body(result);
             }
             
+            // 检查用户名是否已被其他用户使用
+            User existingUser = userService.getUserByUserName(user.getUserName());
+            if (existingUser != null && !existingUser.getUserId().equals(user.getUserId())) {
+                result.put("success", false);
+                result.put("message", "用户名已被其他用户使用");
+                return ResponseEntity.badRequest().body(result);
+            }
+            
+            // 如果密码不为空，则保存原始密码并加密
+            if (user.getPassword() != null && !user.getPassword().trim().isEmpty()) {
+                // 保存原始密码
+                user.setOriginalPassword(user.getPassword());
+                // 对密码进行加密
+                String encryptedPassword = PasswordUtil.encryptPasswordWithDefaultSalt(user.getPassword());
+                user.setPassword(encryptedPassword);
+            }
+            
             boolean success = userService.updateById(user);
             
             if (success) {