Apache Commons Fileupload/Tomcat 无法处理 out.flush() [英] Apache Commons Fileupload / Tomcat cant cope with out.flush()

问题描述

有谁知道一种解决方法，如果您尝试刷新 servlet 输出流，apache commons fileupload 会抛出以下异常?

Does anyone know of a workaround whereby if you are trying to flush the servlet output stream, apache commons fileupload throws the following exception?

FileUploadException: Processing of multipart/form-data request failed. Stream ended unexpectedly

基本上我有代码循环遍历使用 apache commons fileupload 上传的每个文件，然后我尝试 out.flush() 一些关于每个文件的统计信息.即:

Basically I have code that loops through each file uploaded using apache commons fileupload, and then am trying to out.flush() some stats about each file. ie:

    FileItemFactory factory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(factory);
    List<FileItem> items = upload.parseRequest(request);

    for(FileItem field : items) {
        if (!field.isFormField() && field.getName().length()>0 && field.getName().getSize()>0) {
            ArticleImport helper = new ArticleImport(new ArticleImportResponder(user,out));
            // This helper object uses out.flush() to provide feedback to the user.
            helper.process(field.getInputStream(), user);
            }
        }
    }

Apache Tomcat 6.0.20 不会出现该问题，但在早期版本中会出现.

The problem does not occur in Apache Tomcat 6.0.20, but it does occur in earlier versions.

推荐答案

不幸的是，这是一个已知错误，除了确保您使用至少 6.0.20 外，您无能为力.

Unfortunately this is a known bug, there is nothing you can do about it except ensure that your using at least 6.0.20.

您可以检测到哪个版本的 tomcat 正在运行，并使用它来确定您是否可以使用以下调用使用 out.flush():

You could detect which version of tomcat is running and use that to determine if you can use out.flush() using the following call:

javax.servlet.ServletContext.getServerInfo();

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