servletlistener.java~23~

一个java

package bookstore.servlet;

import bookstore.util.*;

import javax.naming.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import javax.rmi.PortableRemoteObject;

public final class ServletListener extends HttpServlet implements ServletContextListener
{
  private ServletContext servletContext=null;
  private EJBGetterSession ejbGetterSession;
  private EJBGetterSessionHome ejbGetterSessionHome;

  public void contextInitialized(ServletContextEvent sce)
  {
    try
      {
        this.servletContext = sce.getServletContext();
        InitialContext initial = new InitialContext();
        Object objref = initial.lookup("EJBGetterSession");
        //look up jndi name and cast to Home interface
        ejbGetterSessionHome = (EJBGetterSessionHome) PortableRemoteObject.narrow(
            ref, EJBGetterSessionHome.class);
        ejbGetterSession = ejbGetterSessionHome.create();
        servletContext.setAttribute("ejbGetterSession",ejbGetterSession);
      }catch(Exception ex)
      {
        System.out.println(ex.getMessage());//要做成对话框提示异常内容
      }
  }
  //Notification that the servlet context is about to be shut down
  public void contextDestroyed(ServletContextEvent sce)
  {
    servletContext.removeAttribute("ejbGetterSession");
    this.servletContext=null;
  }
}