## Using FileUpload Your application should detect whether or not FileUpload should be invoked, based on the HTTP method and the content type of the request. Assuming that you have decided that FileUpload should be invoked, you might write the following code to handle a file upload request:
    DiskFileItemFactory factory = new DiskFileItemFactory();
    // Set upload parameters
    factory.setSizeThreshold(MAX_MEMORY_SIZE);
    factory.setRepository(new File(TEMP_DIR));

    // Create a new file upload handler
    ServletFileUpload upload = new ServletFileUpload( factory );
    upload.setSizeMax(MAX_UPLOAD_SIZE);

    // Parse the request
    List<FileItem> items = upload.parseRequest(request);

    // Process the uploaded fields
    Iterator<FileItem> iter = items.iterator();
    while (iter.hasNext()) {
        FileItem item = iter.next();

        if (item.isFormField()) {
            processTextParameter(request, item);
        } else {
            processFileParameter(request, item);
        }
    }