Session Events: implements HttpSessionBindingListener
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
public class Binder extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
IOException {
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
HttpSession session = req.getSession(true);
SessionObject o = new SessionObject(getServletContext());
session.setAttribute("Binder.object", o);
out.println("<html>");
out.println("<head>");
out.println("<title>Session Binder</title>");
out.println("</head>");
out.println("<body>");
out.println("Object bound to session " + session.getId());
out.println("</body>");
out.println("</html>");
out.flush();
}
}
class SessionObject implements HttpSessionBindingListener {
ServletContext context;
public SessionObject(ServletContext context) {
this.context = context;
}
public void valueBound(HttpSessionBindingEvent event) {
context.log("" + (new java.util.Date()) + " Binding " + event.getName() + " to session "
+ event.getSession().getId());
}
public void valueUnbound(HttpSessionBindingEvent event) {
context.log("" + (new java.util.Date()) + " Unbinding " + event.getName() + " from session "
+ event.getSession().getId());
}
}
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