Java-ServletContextListener

/**
	 * Implementations of this interface receive notifications about
	 * changes to the servlet context of the web application they are
	 * part of.
	 * To receive notification events, the implementation class
	 * must be configured in the deployment descriptor for the web
	 * application.
	 * @see ServletContextEvent
	 * @since	v 2.3
	 */
//实现这个接口会收到这个web 应用的servlet 上下文的改变的通知
public interface ServletContextListener extends EventListener {
	/**
	 ** Notification that the web application initialization
	 ** process is starting.
	 ** All ServletContextListeners are notified of context
	 ** initialization before any filter or servlet in the web
	 ** application is initialized.
	 */
	//上下文初始化，所有的Servlet上下文监听器都会被通知上下文初始化在web应用中所有的过滤器filter或者servlet被初始化之前。
    public void contextInitialized ( ServletContextEvent sce );

	/**
	 ** Notification that the servlet context is about to be shut down.
	 ** All servlets and filters have been destroy()ed before any
	 ** ServletContextListeners are notified of context
	 ** destruction.
	 */
    //上下文销毁， 在ServletContextListeners被通知context销毁的时候所有的servlet和过滤器都已经被销毁
    public void contextDestroyed ( ServletContextEvent sce );
}