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From Mashama McFarlane <>
Subject Re: HttpServletRequest processing
Date Fri, 02 Sep 2005 15:19:58 GMT
Thanks a lot. Actually this is exactly what I was envisioning but my 
problems is that I don' know what type of thread to write to handle the 
upload. I mean I am pretty sure I can't write a servlet thread because I am 
assuming that the servlet container only passes the servlet the request 
after it has received it in its entirety. Please correct me if I am wrong, 
but if this is correct then any solution must be at the container level. So 
the question is what kind of thread? At what level? And is it even possible? 
Thanks for your help.


On 9/1/05, Frank W. Zammetti <> wrote:
> Hi,
> There really is no straight-forward way of doing this. In theory it
> goes against the basic nature of HTTP.
> That being said, Michael McGrady implemented such a solution, and
> hopefully he will see this and be able to talk about it. I'll do my
> best to remember the basic theory...
> You start by targeting your form submission to a new window. This is
> where your progress bar will display. In your servlet that recieves the
> request that contains the file upload, you spawn a new thread to handle
> the upload and return immediately with a page with some Javascript to
> periodically poll the servlet to get the progress of the upload (every 5
> seconds for example). The servlet of course has to retain a reference
> to the thread handling the upload, and it has to have some sort of
> unique identifier to be able to request the status update. This
> identifier is passed to the servlet from the progress window. Once the
> upload completes, a page is returned to inform the user (might be in the
> popup still, might be a page that redirects the parent window of the
> popup to a completion page).
> Michael will hopefully correct me or expand on this as appropriate, but
> that's what I recall being the basic theory behind his approach. I
> think his code was on the Struts Wiki at one point, you may want to go
> have a look and see.
> --
> Frank W. Zammetti
> Founder and Chief Software Architect
> Omnytex Technologies
> Mashama McFarlane wrote:
> > I need some help. I am working with file uploads. The ideal file uploads
> > will be large enough to justify a file upload progress indicator. I am
> > trying to figure out the easiest way of doing this, but it is much more
> > complicated than I originally thought. It would be nice if somebody out
> > there can prove me wrong on that point. I know that if I can monitor the
> > request as it comes into the servlet container, then I can extract out 
> the
> > content-length and then everything else is a matter of counting bytes, 
> but
> > where and how do I do this. This cannot happen in the servlet as, I am
> > assuming, the whole request has been received in its entirity prior the
> > servlet servicing the request. So where on the totem pole need I be. 
> Please
> > advise.
> >
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