Question

我有一个sdr项目，我在实体设置器中进行一些基本验证，如果模型无效则抛出域异常。我无法在异常中获取消息源，以便我可以本地化业务异常消息。我尝试过的自定义异常类是：

@ResponseStatus(org.springframework.http.HttpStatus.CONFLICT)
public class DoublePriceException extends Exception {

    @Autowired
    static ReloadableResourceBundleMessageSource messageSource;

    private static final long serialVersionUID = 1L;

    public DoublePriceException(OrderItem orderItem) {

        super(String.format(
                messageSource.getMessage("exception.doublePricedItem", null, LocaleContextHolder.getLocale()),
                orderItem.name));

    }

}

我如何尝试抛出这个mofo：

public void setPrices(List<Price> prices) throws DoublePriceException {

        for (Price price : prices) {

            List<Price> itemsPrices = prices.stream().filter(it -> price.item.equals(it.item)).collect(Collectors.toList());

            if(itemsPrices.size() > 1)
                throw new DoublePriceException(itemsPrices.get(0).item);

        }

        this.prices = prices;

    }

messageSource始终为null。我正在尝试无法实现的目标吗？

Answer 1

DoublePriceException显然不是Spring托管Bean，因此不起作用。

您可以在应用程序中注册Spring ControllerAdvice来处理异常并生成合适的响应。

/**
 * Spring MVC @link {@link ControllerAdvice} which 
 * is applied to all Controllers and which will handle 
 * conversion of exceptions to an appropriate JSON response.
 */
@ControllerAdvice
public class ErrorHandlingAdvice
{
  /**
   * Handles a @DoublePriceException 
   *
   * @param ex the DoublePriceException 
   * 
   * @return JSON String with the error details.
   */
  @ExceptionHandler(DoublePriceException.class)
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ResponseBody
  public Object processValidationError(DoublePriceException  ex)
  {
    //return suitable representation of the error message
    //e.g. return Collections.singletonMap("error", "my error message");
  }
}

将上述内容放在Spring框架扫描的软件包中应该足以让它被检测和应用。

Answer 2

我能想出的最好的方法就是抓住HttpMessageNotReadableException并致电getMostSpecificCause()，如下所示：

@RestControllerAdvice
public class ExceptionHandlingAdvice {

    @Autowired
    private MessageSource messageSource;

    @ExceptionHandler(HttpMessageNotReadableException.class)
    public ResponseEntity<Object> onException(HttpMessageNotReadableException ex, WebRequest request) {

        Locale locale = request.getLocale();
        Throwable cause = ex.getMostSpecificCause();
        String message = cause.getMessage();

        if (cause instanceof MultiplePriceException) {

            message = messageSource.getMessage("exception.multiple.price",
                    new Object[] { ((MultiplePriceException) cause).orderItem.name }, locale);

        }

        return new ResponseEntity(Collections.singletonMap("error", message), new HttpHeaders(),
                HttpStatus.BAD_REQUEST);

    }
}

Spring数据休息i18n域异常

2 个答案: