How to know if the pdf file is opened.

Hi,
on my web site I have many pages containing hundrend of url pointing to the pdf documents.
The problem is how I can know that the pdf file was open or downloaded by user ( I used session for this task). I have to point out that I did not integrate in my page any javascript action on those documents.
This point will help me to solve some historical access on the web site.
Thank you

Your best bet would be to create a filter that will handle access to pdf files. This filter would be bound to /*.pdf and can have access to the users HttpSession object so you are able to find out who requested this file and logic it how ever you wish.
I Hope this helps
-Richard Burton

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