Problem using Commons fileupload for progress bar with Javaworld example

lielar <>
Sun, 24 Aug 2008 21:32:54 -0700 (PDT)

I'm using Apache Commons for FileUpload to do a progress bar using
Ajax. I'm using prototype for ajax. I'm having trouble trying to track
the progress of the file upload. I'm using the example at

Here is the relevant code ...

            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            CustomProgressListener l = new CustomProgressListener();
            fileID = Integer.parseInt(generateRandomNumber(4));
            map2.put(fileID, l);
            try {
                List<FileItem> items = upload.parseRequest(req);
                System.out.println("UploadMe::process2 items "+items);
                for (Iterator<FileItem> i = items.iterator(); i.hasNext(); ) {
                    FileItem item =;
                    System.out.println("FileUpload::process2 name "+item.getName());
                    item.write(new File(PATH+item.getName()));

                System.out.println("UploadMe::process2 after parseRequest");
                PrintWriter pw = res.getWriter();
                pw.write("<script type=\"text/javascript
            } catch (Exception e) {

I found that when the code hits 'upload.parseRequest', the servlet
completes that line, that is uploads the file before proceeding. Hence
I can't track the file upload even using the ProgressListener

The map, is just keeping track of the instance so that I can load the
object again. In the Javaworld example, they use the session.

Has anybody come across issues? How can I make sure that parseRequest
is executed, but the servlet doesn't complete the step?

Everything else (ie, AJAX communicating) works.


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