WEB容器监听器详解 ServletContextListener
WEB容器监听器ServletContextListener主要用来监听容器启动和 销毁的时候需要做一些操作,就可以使用这个监听器来做。
ServletContextListener在Spring启动前启动。
我们实现一个简单的监听器,需要继承接口ServletContextListener:
* 一个测试的监听器例子 * @author zhuli * @date 2014-7-26 */ public class TestContextLister implements ServletContextListener { @Override public void contextInitialized(ServletContextEvent sce) { System.out.println("==============================容器装载"); } @Override public void contextDestroyed(ServletContextEvent sce) { System.out.println("==============================容器销毁"); } }
ServletContextListener 实现两个接口,一个是容器启动的时候,一个是容器销毁的时候:
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>
容器启动后,会在容器启动的日志中看到:
==============================容器装载 2014-07-26 08:54:01.302:INFO:/:Initializing Spring FrameworkServlet 'apiServlet'
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