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Question for coreyit

Posted on 2002-04-04
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Last Modified: 2010-04-01
Hi coreyit,

Few weeks ago, you helped me with a JSP session question. You mentioned a way to release any held resources when the session is about to die using HttpSessionBindingListener.  

Could you be a little more specific of how to use it? Or a simple example would be great.

Thanks a lot.

Sam
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Question by:samantha
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kotan earned 200 total points
ID: 6920063
Create an object which implement HttpSessionBindingListener. This object should be stored in the session.
Then, implement the valueBound() and valueUnBound() method. The valueUnbound() method will
be trigger if this object being unbound (This happen when the object is being replaced or session is invalid). In here, you can get the invalid session and delete away the record from the database.

public class BoundObj implements HttpSessionBindingListener {
  public BoundObj() {}
  public void valueBound(HttpSessionBindingEvent be) {
       // Will be trigger when this object being bound.
  }

  public void valueUnBound(HttpSessionBindingEvent be) {
      HttpSession hs = be.getSession();
      String userid = hs.getAttribute("userid");
      String sessionid = hs.getID();
      ....
      // Delete database record.
  }
}
At the time the user login which you create a new session, put the bound object in that session.
session.setAttribute("boundobj", new boundObj());
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Author Comment

by:samantha
ID: 6921736
kotan, thank you very much!

Sam
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