HttpSessionBindingListener

[Bharatesh H Kakamari]

What is HttpSessionBindingListener interface ? Where is it used ?

[lokesh reddy]

Hi Bharat,
HttpSessionBindingListener is an interface specifically used for session management.
If u want to know when the session is binded and unbinded, then u have to implement a class with this interface and use it in your servlet.
This interface has two methods 1) valueBound 2) valueUnBound
Implementing this two methods, u can do some useful work like whenever a session is binded, u can load the user related file in to memory and perform some actions on it, and when ever the session ends you can save the data back.
I hope u find this info useful.
bye.
Loke

[Peter den Haan]

Not entirely accurate
HttpSessionBindingListener is not so much about session lifetime as about the lifetime of session-scoped objects.
You can implement the HttpSessionBindingListener in any object you want to bind in the session. If you do, your object will be alerted when it is bound to a session, and when it is unbound for whatever reason (session expiration or a removeAttribute call).
This is useful if the object needs to do some initialisation or clean-up, such as managing external resources or the co-ordinated (un)binding of related session scoped objects.
- Peter