弹簧异常处理程序返回错误代码列表

Question

如何返回Spring ExceptionHandler类中的List<DataStruture>错误代码？我尝试了以下代码：

@ExceptionHandler({ CustomException.class })
@ResponseStatus(HttpStatus.CONFLICT)
public List<ErrorOutDTO> handle(CustomException theException) {
    return new null;
} 

我被方法的返回类型击中。

Answer 1

您应该绑定响应性中的错误列表，然后返回。

 @ExceptionHandler(CustomException.class)
    public ResponseEntity<List<ErrorOutDTO>> validationExceptionHandler(CustomException exception) {
        List<ErrorOutDTO> list = new ArrayList<>();
        ErrorOutDTO error = new ErrorOutDTO();
        error.setField(exception.getField());
        error.setMessage(exception.getMessage());
        list.add(error);
        return (ResponseEntity<List<ErrorOutDTO>>)new ResponseEntity(list, HttpStatus.CONFLICT);
    }

Answer 2

例如，如果异常是CondainVioLationException：此异常报告约束违规的结果

@ExceptionHandler({ ConstraintViolationException.class })
public ResponseEntity<Object> handleConstraintViolation(
  ConstraintViolationException ex, WebRequest request) {
    List<String> errors = new ArrayList<String>();
    for (ConstraintViolation<?> violation : ex.getConstraintViolations()) {
        errors.add(violation.getRootBeanClass().getName() + " " + 
          violation.getPropertyPath() + ": " + violation.getMessage());
    }
    ApiError apiError = 
      new ApiError(HttpStatus.BAD_REQUEST, ex.getLocalizedMessage(), errors);
    return new ResponseEntity<Object>(
      apiError, new HttpHeaders(), apiError.getStatus());
}