Hi, In HttpSession you have a methods to find out
since when the session has begun and how long (in ms)
it has been in action. Also you have methods to find
out how long the session has not been active too.
calculatin these parameters and appropriately reducing
from the total session time, you can arrive at the
required solution. Have you explored this. Let me know
if you need further details.
Haran from India
--- Raymond Blum <[EMAIL PROTECTED]> wrote:
> Thanks! I can see this doing what I need and a lot
> more that i hadn't yet addressed.
>
> ---Raymond
>
> Pavel Veller wrote:
> >
> > RB> Hi there
> > RB> I have a servlet (part of a web appl in JRun
> 3.0SP2 under Linux) that I would like to have detect
> > RB> when a user's session has timed out (i.e. the
> web application session timeout has been reached)
> > RB> Currently I know that this has happened when
> my servlet attempts to get a RequestDispatcher
> with...
> > RB> "getServletContext().getRequestDispatcher(..."
> > RB> ....and gets a NULL back.
> > RB> I would like like a clearer way of detecting
> that the user session is invalid/has timed out than
> > RB> just the NULL RD since presumable the null RD
> could have been a result of other problems as well.
> > RB> Any help or pointers greatly appreciated!
> > RB> ---Raymond
> >
> > You can do as follows: (We use this solutions for
> logging User sessions):
> >
> > 1)
> > public class UserSession {
> > ....
> > public boolean begin() {
> > .. session started
> > }
> >
> > public boolean end() {
> > ... session ended / invalidate
> > }
> > }
> >
> > 2)
> > final public class HttpUserSession extends
> UserSession implements
> javax.servlet.http.HttpSessionBindingListener {
> >
> > public HttpUserSession(){
> > super();
> > ....
> > }
> >
> > public void
>
valueBound(javax.servlet.http.HttpSessionBindingEvent
> event) {
> > if (!begin()) {
> > // log "can not start session tracking"
> > }
> > }
> >
> > public void
>
valueUnbound(javax.servlet.http.HttpSessionBindingEvent
> event) {
> > if (!end()) {
> > // log "can not finish session tracking"
> > }
> > }
> > }
> >
> > 3)
> > in jsp code: (login_action.jsp)
> >
> >
>
session.setAttribute(HttpUserSession.class.getName(),
> new HttpUserSession());
> >
> >
>
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