refactor(system): 优化用户管理相关代码

- 调整代码格式和缩进，提高可读性
- 重构用户角色关联逻辑，提取为独立方法- 更新用户更新 DTO，支持多角色选择

src/main/java/com/zsc/edu/gateway/modules/system/dto/UserUpdateDto.java

@@ -12,6 +12,9 @@ import jakarta.validation.constraints.NotEmpty;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Pattern;
 
+import java.util.List;
+import java.util.Set;
+
 /**
  * 用户更新Dto
  *
@@ -59,11 +62,13 @@ public class UserUpdateDto {
     public String address;
 
     /**
-     * 用户身份集合
+     * 用户身份
      */
     @NotEmpty(message = "角色不能为空")
     public Long roleId;
 
     public String remark;
 
+    public Set<Long> roleIds;
+
 }

src/main/java/com/zsc/edu/gateway/modules/system/service/impl/UserServiceImpl.java

@@ -58,15 +58,7 @@ public class UserServiceImpl extends ServiceImpl<UserRepository, User> implement
             return false;
         }
         if (dto.getRoleIds() != null && !dto.getRoleIds().isEmpty()) {
-            List<UserRole> userRoles = dto.getRoleIds().stream()
+            addUserRole(dto.getRoleIds(), user.getId());
-                    .map(roleId -> {
-                        UserRole userRole = new UserRole();
-                        userRole.setUserId(user.getId());
-                        userRole.setRoleId(roleId);
-                        return userRole;
-                    })
-                    .collect(Collectors.toList());
-            userRolesRepository.insert(userRoles);
         }
         return true;
     }
@@ -82,6 +74,10 @@ public class UserServiceImpl extends ServiceImpl<UserRepository, User> implement
         if (user.getEmail().equals(dto.getEmail()) && existsByEmail) {
             throw new ConstraintException("email", dto.email, "邮箱地址已存在");
         }
+        if (dto.getRoleIds() != null && !dto.getRoleIds().isEmpty()) {
+            userRolesRepository.delete(new LambdaQueryWrapper<UserRole>().eq(UserRole::getUserId, id));
+            addUserRole(dto.getRoleIds(), user.getId());
+        }
         BeanUtils.copyProperties(dto, user);
         return updateById(user);
     }
@@ -159,4 +155,16 @@ public class UserServiceImpl extends ServiceImpl<UserRepository, User> implement
         return userDetails;
     }
 
+    public Boolean addUserRole(Set<Long> roleIds, Long userId) {
+        List<UserRole> userRoles = roleIds.stream()
+                .map(roleId -> {
+                    UserRole userRole = new UserRole();
+                    userRole.setUserId(userId);
+                    userRole.setRoleId(roleId);
+                    return userRole;
+                })
+                .collect(Collectors.toList());
+        userRolesRepository.insert(userRoles);
+        return true;
+    }
 }