"Ssemwogerere, Joseph" wrote:
> I am using jrun and would like to be able to warn the user that the session
> is about to expire and gracefully lead them to the start page once it has
> expired. Has anyone implemented something similar or can someone lead me to
> where I might find a solution.
> Joe.
>
While the user is looking at the page, there isn't any connection between the
server and a host. I suppose you could implement some sort of count-down
counter in a JavaScript function included on each page that popped up a window
when the time limit was approaching. Alternatively, you could investigate some
sort of "web-push" approach where a second window had a meta-refresh setting to
keep asking how much time is left (but this is going to create lots of network
traffic).
For leading them to the login page, this is what I do in each servlet (and JSP
page)
* Call request.getSession(true) to create a new session if the old one expired
* Check for the existence of a particular object in the session (which
will not be there in a new one, obviously).
* Use a RequestDispatcher.forward() call to redirect the user to
the login page if the object is not there.
* In the login-accepting logic that validates the user, store an object
in the session for other servlets to check.
Craig McClanahan
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