--- Raymond Xu <[EMAIL PROTECTED]> wrote:
> Hi, I just built up a few pages which can use
> session attributes to judge
> whether a user has logged in. I don't know how to
> count how many users have
> logged in at the same.
>
> Any help will be appreciated!!
>
> Raymond
>
One way of doing this is to create an
application-scope variable (an Integer in
getServletContext()) which contains the current number
of active sessions. You simply increment this when
somebody logs on and decrement this when he/she logs
off.
As an alternative to using an Integer object, you can
use a map (most likely a Hashtable) to store/delete
the session objects (HttpSession).
In any case, it might be helpful to create a 'cleanup'
program which would be invoked every time a session is
invalidated or had timed out. Check out about
HttpSession Binding Listener interface, esp. the
valueUnbound() method.
Hope this helps. Good luck.
Dingdong Lorico
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