How can i know how many visitors are online now?

i'm making an application like forum...
but what i cant do,, is how can i know how many persons are viewing my forum (members, and guests)???

It's not possible to know with absolute certainty because HTTP is a stateless protocol.
The HttpSession object, however, gives you a lot of information that can bring you pretty close.
On my site, I have a sample application that uses filters and a context scoped map to track user information and make it available to an admin servlet.
It shows the user's name, IP, session number, how long they've been on, how long it's been since the last time they've hit the site, how long before their session expires (if they don't hit the site again), and what page they were on last.
You can download this app at:
http://simple.souther.us
Look for SessionMonitor.

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