Well, I would defer to Michael to answer this, as I don't know the
answer myself, I'd have to go research and figure it out. One thing
that comes to mind though is doing it with a filter (with a
RequestWrapper involved I would think) so you would have access to the
request "as it forms", so to speak. You would spawn a new thread from
the filter, giving is a reference to the wrapper, and continue
processing from there.
That being said, I do not recall his solution being filter-based, so
there must be another (probably simpler) answer.
Frank
Mashama McFarlane wrote:
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.
Sincerely,
Mashama
On 9/1/05, Frank W. Zammetti <[EMAIL PROTECTED]> 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
http://www.omnytex.com
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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Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
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