Spring Boot使用JSR-380进行校验的示例

public Result add(@RequestBody User user){
  if(StringUtils.isBlank(user.getName())){
    return Result.error("用户名不能为空");
  }
  // ...
}

@Data
public class User{
  @NotBlank
  private String name;
  private Integer age;
}

public Result register(@Validated @RequestBody User user){
  // ...
}

@ControllerAdvice
public class GlobalExceptionHandler {

  @ExceptionHandler(value = {MethodArgumentNotValidException.class, BindException.class})
  public ResponseEntity<Result> methodArgumentNotValidHandler(HttpServletRequest request, Exception e) {
    BindingResult bindingResult;
    if (e instanceof MethodArgumentNotValidException) {
      //@RequestBody参数校验
      bindingResult = ((MethodArgumentNotValidException) e).getBindingResult();
    } else {
      //@ModelAttribute参数校验
      bindingResult = ((BindException) e).getBindingResult();
    }
    FieldError fieldError = bindingResult.getFieldError();
    return ResponseEntity.ok(Result.fail(Result.CODE_PARAMS_INVALID, "[" + fieldError.getField() + "]" + fieldError.getDefaultMessage()));
  }

  //@RequestParam参数校验
  @ExceptionHandler(value = {ConstraintViolationException.class, MissingServletRequestParameterException.class})
  public ResponseEntity<Result> constraintViolationHandler(Exception e) {
    String field;
    String msg;
    if (e instanceof ConstraintViolationException) {
      ConstraintViolation<?> constraintViolation = ((ConstraintViolationException) e).getConstraintViolations().stream().findFirst().get();
      List<Path.Node> pathList = StreamSupport.stream(constraintViolation.getPropertyPath().spliterator(), false)
          .collect(Collectors.toList());
      field = pathList.get(pathList.size() - 1).getName();
      msg = constraintViolation.getMessage();
    } else {
      // 这个不是JSR标准返回的异常，要自定义提示文本
      field = ((MissingServletRequestParameterException) e).getParameterName();
      msg = "不能为空";
    }
    return ResponseEntity.ok(Result.fail(Result.CODE_PARAMS_INVALID, "[" + field + "]" + msg));
  }
}