Source Code : Session Events: implements HttpSessionBindingListener

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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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