Grails4-在上传文件时超过文件maxFileSize限制 [英] Grails4 - catching file maxFileSize limit when exceeded on uploading a file

问题描述

我想捕获此异常，而不是简单地将500退还给最终用户，这是一个糟糕的体验，至少在我的应用程序中. 目的是使用户返回到表单页面，并提供一些反馈，以便他们再次尝试.

I would like to catch this exception rather than simply returning a 500 to the end users which is a poor experience, at least in my application. The intention would be to return the user back to the form page with some feedback for them to try again.

当前的经验是将用户退回500，并将以下内容打印到日志中；

The current experience is to throw the user back a 500 and the following is printed to the logs;

Caused by: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (157552) exceeds the configured maximum (1024)

推荐答案

为此起点而对@ james-kleeh进行信用;

Crediting @james-kleeh for this head start;

但是当我扩展StandardServletMultipartResolver实现时，我只能在Grails 4.0.0.M2上使用它，这是默认设置.然后，可以继续从config(yaml)解析maxFileSize限制.

But I could only get this working on Grails 4.0.0.M2 when I extend the StandardServletMultipartResolver implementation which is what is used as default. Then the maxFileSize limits continue to be resolved from config (yaml).

public class MyMultipartResolver extends StandardServletMultipartResolver {

    static final String FILE_SIZE_EXCEEDED_ERROR = "fileSizeExceeded"

    public MultipartHttpServletRequest resolveMultipart(HttpServletRequest request) {
        try {
            return super.resolveMultipart(request)
        } catch (MaxUploadSizeExceededException e) {
            request.setAttribute(FILE_SIZE_EXCEEDED_ERROR, true)
            return new DefaultMultipartHttpServletRequest(request, new LinkedMultiValueMap<String, MultipartFile>(), new LinkedHashMap<String, String[]>(), new LinkedHashMap<String, String>());
        }
    }
}

在resources.groovy中具有以下内容；

With the following in resources.groovy;

// catch exception when max file size is exceeded
multipartResolver(MyMultipartResolver)

您随后需要检查控制器中的 FILE_SIZE_EXCEEDED_ERROR 属性并进行相应的处理.

You need to subsequently check for the FILE_SIZE_EXCEEDED_ERROR attribute in the controller and handle accordingly.

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