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How to know user session

 
Sathyanarayana Katakam
Greenhorn
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Hi,
How can I trace the users, (in case of servlets) who is connected to the server?
Ex: in case of chat application how to find the users connected to server? How can the server will notified in case of session expiration.
Thanks,
Satya.

[This message has been edited by Sathyanarayana Katakam (edited December 27, 2000).]
[This message has been edited by Sathyanarayana Katakam (edited December 27, 2000).]
 
Danny Mui
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Well you need some way to track users, usually you add some Principal-type object to the HttpSession. You can make that user object implement a HttpListener interface to have it do things on session adding/removing which also happens to be a way of noticing a session expiring!
 
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