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));

   }

}