在servlet里如何得知服务器启动和即将关闭的信息？急~

Question

import javax.servlet.*;
import javax.servlet.http.*;public class MyAppListener implements 
       ServletContextLister
       ,HttpSessionLister
       ,HttpSessionActivateListener
       ,HttpSessionBindLisener          {  public void contextInitialized(ServletContextEvent event){ 
    System.out.println("我的应用程序启动了，赶紧拿起相机拍张千年等一回的照片先！");
  }
  public void contextDestroyed(ServletContextEvent event){
    System.out.println(" 被压五行山下，五百年后美猴王还会出山的！");
  }  public void sessionCreated(xxx  ){  }  public void sessionDestroyed(xxx ){  }
}#web.xml<web-app>
  <listener>
   <listener-class>MyAppLister</listener-class>
  </listener>
</web-app>