如何处理Spring Boot中的最大文件大小异常？ [英] How to handle maximum file size Exception in Spring Boot?

问题描述

我使用Spring Boot v1.2.5创建REST应用程序。上传图片时，我检查了最大文件大小，提供了属性：

I am using Spring Boot v1.2.5 for creating a REST Application. While uploading images, I have a check for maximum file size , which is provided the property :

multipart.maxFileSize= 128KB

。该工具由Spring Boot本身提供。现在检查工作正常。问题是，如何处理异常并向用户返回他能理解的消息？

in application.properties. This facility is provided by Spring Boot itself. Now the check is working properly. The question is, how do I handle the exception and return a message to the user that he can understand ?

更新1 ----------

Update 1----------

我在Controller中编写了一个方法，我打算使用 @ExceptionHandler 来处理MultipartException。它似乎不起作用。

I wrote a method within my Controller, where I intend to handle the MultipartException, using @ExceptionHandler. It does not seem to work.

这是我的代码：

@ExceptionHandler(MultipartException.class)
@ResponseStatus(value = HttpStatus.PAYLOAD_TOO_LARGE)
public ApplicationErrorDto handleMultipartException(MultipartException exception){
    ApplicationErrorDto applicationErrorDto =  new ApplicationErrorDto();
    applicationErrorDto.setMessage("File size exceeded");
    LOGGER.error("File size exceeded",exception);
    return applicationErrorDto;
}

更新2 ----------

Update 2----------

@luboskrnac指出后，我设法找到了解决方案。我们可以在这里使用 ResponseEntityExceptionHandler 来处理这种特殊情况。我相信，我们也可以使用 DefaultHandlerExceptionResolver ，但 ResponseEntityExceptionHandler 将允许我们返回 ResponseEntity ，与前者相反，其方法将返回 ModelAndView 。我还没有试过它。

After @luboskrnac pointed it out, I have managed to come up with a solution. We can use ResponseEntityExceptionHandler here to handle this particular case. I believe, we could also have used DefaultHandlerExceptionResolver, but ResponseEntityExceptionHandler will allow us to return a ResponseEntity, as opposed to the former, the methods of which will return ModelAndView. I have not tried it though.

这是我用来处理 MultipartException <的最终代码/ code>：

This is the final code that I'm using to handle the MultipartException :

@ControllerAdvice
public class CustomResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {

private static final Logger LOGGER = Logger.getLogger(CustomResponseEntityExceptionHandler.class);

@ExceptionHandler(MultipartException.class)
@ResponseStatus(value = HttpStatus.PAYLOAD_TOO_LARGE)
@ResponseBody
public ApplicationErrorDto handleMultipartException(MultipartException exception){
    ApplicationErrorDto applicationErrorDto =  new ApplicationErrorDto();
    applicationErrorDto.setMessage("File size exceeded");
    LOGGER.error("File size exceeded",exception);
    return applicationErrorDto;
}
}

我使用Swagger开发/记录REST Apis。这是上传超过大小的文件时的响应。

谢谢。

I am using Swagger for developing/documenting REST Apis. This is the response upon uploading a file that exceeds the size. Thanks.

推荐答案

Spring Boot文档说：

您还可以使用常规的Spring MVC功能，例如 @ExceptionHandler
方法和 @ControllerAdvice 。然后 ErrorController 将获得
任何未处理的异常。

You can also use regular Spring MVC features like @ExceptionHandler methods and @ControllerAdvice. The ErrorController will then pick up any unhandled exceptions.

由于 MultipartException 似乎在 @ Controller / @ ExceptionHandler / @ ControllerAdvice 功能开始之前出现，你应该使用 ErrorController 来处理它。

As MultipartException seem to hapen before @Controller/@ExceptionHandler/@ControllerAdvice features comes into play, you should use ErrorController to handle it.

BTW，我发现这是在此期间的线程。你可能想看看。

BTW, I found this thread in the meantime. you may want to take a look.

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