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import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
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 SessionBindings extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
IOException {
res.setContentType("text/plain");
PrintWriter out = res.getWriter();
// Get the current session object, create one if necessary
HttpSession session = req.getSession();
// Add a CustomBindingListener
session.setAttribute("bindings.listener", new CustomBindingListener(getServletContext()));
out.println("This page intentionally left blank");
}
}
class CustomBindingListener implements HttpSessionBindingListener {
ServletContext context;
public CustomBindingListener(ServletContext context) {
this.context = context;
}
public void valueBound(HttpSessionBindingEvent event) {
context.log("[" + new Date() + "] BOUND as " + event.getName() + " to "
+ event.getSession().getId());
}
public void valueUnbound(HttpSessionBindingEvent event) {
context.log("[" + new Date() + "] UNBOUND as " + event.getName() + " from "
+ event.getSession().getId());
}
}
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