WEB容器監聽器詳解 ServletContextListener

標籤：des   blog   java   使用   io   2014   for   art   

WEB容器監聽器ServletContextListener主要用來監聽容器啟動和 銷毀的時候需要做一些操作，就可以使用這個監聽器來做。

ServletContextListener在Spring啟動前啟動。

我們實現一個簡單的監聽器，需要繼承介面ServletContextListener：

 * 一個測試的監聽器例子 * @author zhuli * @date 2014-7-26 */public class TestContextLister implements ServletContextListener {    @Override    public void contextInitialized(ServletContextEvent sce) {        System.out.println("==============================容器裝載");    }    @Override    public void contextDestroyed(ServletContextEvent sce) {        System.out.println("==============================容器銷毀");    }}

ServletContextListener 實現兩個介面，一個是容器啟動的時候，一個是容器銷毀的時候：

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. */    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. */    public void contextDestroyed ( ServletContextEvent sce );}

在web.xml中的配置：

<listener><listener-class>com.xxx.controller.web.TestContextLister</listener-class></listener>

容器啟動後，會在容器啟動的日誌中看到：

==============================容器裝載2014-07-26 08:54:01.302:INFO:/:Initializing Spring FrameworkServlet 'apiServlet'