[Springframework-developer] Spring Portlet MVC - Multipart Support

[John L. <jl...@ar...>]

The main issue with integrating Multipart support into Spring Portlet 
MVC is the need for commons-fileupload-1.1 for JSR-168 support.  I've 
talked with Juergen about this and we agree that we do not want to 
update Spring's use of commons-fileupload until some kind of release 
gets pushed out.

I (and several others) have asked the maintainers of commons-fileupload 
about their plans for a 1.1 release.  I was directed to a 20 Oct 2005 
posting from Martin Cooper on the commons-dev mailing list.  In that 
posting he states that there is no formal release plan yet, but he is 
hopeful to spend some time on it soon.  You can see the complete posting 
here:

http://www.mail-archive.com/com...@ja.../msg68563.html

Given the lack of specificity around a 1.1 release, we are going to put 
integration of Multipart support for Spring Portlet MVC on hold for 
now.  Once commons-fileupload-1.1 is released, then we will formally 
integrate it into Spring.

Until this happens, you can either use a custom version of the 
appropriate classes or utilize commons-fileupload-1.1-dev directly 
yourself.  The latter option is actually quite simple.  As an example, 
here is a simplified version of an onSubmitAction method for a 
SimpleFormController that handles a file upload:

   protected void onSubmitAction(ActionRequest request,
           ActionResponse response, Object command, BindException errors)
           throws ServletException, IOException {

       PortletRequestContext prc = new PortletRequestContext(request);
       boolean isMultiPart = FileUpload.isMultipartContent(prc);

       if (isMultiPart) {

           DiskFileItemFactory factory = new DiskFileItemFactory();
           factory.setSizeThreshold(getMaxFileSize());
               PortletFileUpload upload = new PortletFileUpload(factory);
                          try {
               List fileItems = upload.parseRequest(request);
               for (Iterator i = fileItems.iterator(); i.hasNext();) {
                   FileItem fileItem = (FileItem) i.next();
                   if (!"".equals(fileItem.getName()) && 
fileItem.getSize() > 0 ) {
                       byte array[] = new byte[(int)fileItem.getSize()];
                       fileItem.getInputStream().read(array);
                       // do something here to save the array
                       // and possibly use fileItem.getContentType()
                   }
               }
           } catch (Exception e) {
               // process any relevant exceptions
           }

       } else {
           // no file submitted
       }
   }

Please send me any feedback about this.

John Lewis