Spring boot中抛出验证异常

@RestController
public class UserController {

    @PostMapping("/users")
    public ResponseEntity<String> createUser(@Validated @RequestBody User user) {
        // 处理用户创建逻辑
        return ResponseEntity.ok("User created successfully");
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<String> handleValidationException(MethodArgumentNotValidException ex) {
        // 获取验证失败的字段和错误信息
        BindingResult bindingResult = ex.getBindingResult();
        List<FieldError> fieldErrors = bindingResult.getFieldErrors();

        // 构建错误信息
        StringBuilder errorMessage = new StringBuilder();
        for (FieldError fieldError : fieldErrors) {
            errorMessage.append(fieldError.getField())
                    .append(": ")
                    .append(fieldError.getDefaultMessage())
                    .append("; ");
        }

        // 返回错误信息给用户
        return ResponseEntity.badRequest().body(errorMessage.toString());
    }
}