@WebListener 注解方式实现监听

1.创建 Dynamic Web Project ,Dynamic Web module version选择3.0

2.在自动生成 的web.xml配置，增加 metadata-complete="false"

 <?xml version="1.0" encoding="UTF-8"?>
 <javaee:web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://Java.sun.com/xml/ns/javaee"
 xmlns:javaee="http://java.sun.com/xml/ns/javaee"
 xmlns:web="http://java.sun.com/xml/ns/javaee"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  metadata-complete="false" version="3.0">
   <javaee:display-name></javaee:display-name>
   <javaee:welcome-file-list>
     <javaee:welcome-file>index.html</javaee:welcome-file>
   </javaee:welcome-file-list>
 </javaee:web-app>

3.创建监听类，在监听类头部增加 注解 @WebListener

package com.xhkj.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
@WebListener
public class MyServletContextListener implements ServletContextListener {
	 @Override
	    public void contextDestroyed(ServletContextEvent sce) {
	        System.out.println("===========================MyServletContextListener销毁");
	    }

	    @Override
	    public void contextInitialized(ServletContextEvent sce) {
	        System.out.println("===========================MyServletContextListener初始化");
	        System.out.println(sce.getServletContext().getServerInfo());
	    }

}

4.启动tomcat服务。打印结果如下

5 注意事项，每次修改配置或者java代码后，要重新编译，否则不起作用

6 代码所在地址

https://files.cnblogs.com/files/xhkj/TestWebListener.rar