Apache FileUpload 不适用于 springboot：ServletFileUpload.parseRequest 始终为空

Question

我正在使用 springboot 2.2.6.RELEASE 和 commons-fileupload 1.4 我已经禁用了 spring.servlet.multipart 如下：

spring.servlet.multipart.enabled = false

我的控制器如下：

@RequestMapping(value = "/UploadFileServlet", method = RequestMethod.POST)
public void doPost(HttpServletRequest request, HttpServletResponse response) throws Exception {
    try {
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);

        if (isMultipart) {
            DiskFileItemFactory factory = new DiskFileItemFactory();
            factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
            factory.setSizeThreshold(DiskFileItemFactory.DEFAULT_SIZE_THRESHOLD);
            factory.setFileCleaningTracker(null);
            ServletFileUpload upload = new ServletFileUpload(factory);
            List<FileItem> items = upload.parseRequest(request);

            String imageFileName = request.getParameter("imageFileName");

            Iterator<FileItem> iter = items.iterator();
            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();
                if (!item.isFormField()) {
                    try (InputStream uploadedStream = item.getInputStream();
                         OutputStream out = new FileOutputStream(imageFileName);) {
                        IOUtils.copy(uploadedStream, out);
                    }
                }
            }
        }
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

问题：upload.parseRequest总是returns一个空列表

Answer 1

我找到了解决方案，我有一个未针对特定 url 模式配置的 primefaces 库的文件上传过滤器，因此在我配置 url 模式后它窃取了请求为此，问题已解决：

@Bean
    public FilterRegistrationBean FileUploadFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new org.primefaces.webapp.filter.FileUploadFilter());
        registration.setName("PrimeFaces FileUpload Filter");
        registration.addUrlPatterns("/faces/*");
        registration.addUrlPatterns("*.xhtml");
        return registration;
    }