Nauman Rafique wrote:
> Hi,
> I am trying to keep a usage record for each user who connects to my servlet.
> So I need some function which is called when a session is destroyed.....so
> that i can record the creation and termination time for a session.........
> Can any body tell me if there is some function like that or how to keep the
> usage record???
>
> Thanks in advance
> [...]
Hi :-) from a email in Servlet-List, I suggest you try the following:
- when a object implementing javax.servlet.http.HttpSessionBindingListener
is bening added to a HttpSession, the method valueBound() will be
invoked; and if this object is being removed from this HttpSession,
the method valueUnbound() will be invoked.
- so if we are sure that we don't add/removed this object by ourself, But
the valueBound()/valueUnbound() is/are still invoked, then we can believe
that the reason is: this Httpsession is caeated/invalidated (or "timeout")
- so in this case, I think you can use valueBound()/valueUnbound() to
record the creation and termination time for a session. the following
is a sample code I study from that email:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
class Recoder implements HttpSessionBindingListener{
public void valueBound(HttpSessionBindingEvent evt){
System.out.println("in CleanUp, valueBound...");
}
public void valueUnbound(HttpSessionBindingEvent evt){
System.out.println("in CleanUp, valueUnBound...");
}
}
and you can use this Recoder class in your Servlet, for example:
...
session=req.getSession(true);
...
session.setAttribute( "Recoder", new Recoder() );
...
Bo
Mar11, 2001
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