Servlet3.0的注解自定义原生Listener监听器实战

Posted 2021-02-02 116970u

简介：监听器介绍和Servlet3.0的注解自定义原生Listener监听器实战

　　自定义Listener(常用的监听器 servletContextListener、httpSessionListener、servletRequestListener)

　　代码示例：

　　RequestListener.java

 1 package net.xdclass.demo.listener;
 2 
 3 import javax.servlet.ServletContextEvent;
 4 import javax.servlet.ServletContextListener;
 5 import javax.servlet.annotation.WebListener;
 6 
 7 @WebListener
 8 public class CustomContextListener implements ServletContextListener{
 9 
10     //主要作为资源加载
11     @Override
12     public void contextInitialized(ServletContextEvent sce) {
13         System.out.println("======contextInitialized========");
14         
15     }
16 
17     @Override
18     public void contextDestroyed(ServletContextEvent sce) {
19         System.out.println("======contextDestroyed========");
20         
21     }
22 
23 }

　　

　　CustomContextListener.java：

 1 package net.xdclass.demo.listener;
 2 
 3 import javax.servlet.ServletRequestEvent;
 4 import javax.servlet.ServletRequestListener;
 5 import javax.servlet.annotation.WebListener;
 6 
 7 @WebListener
 8 public class RequestListener implements ServletRequestListener {
 9 
10     //主要作为统计
11     @Override
12     public void requestDestroyed(ServletRequestEvent sre) {
13         // TODO Auto-generated method stub
14         System.out.println("======requestDestroyed========");
15     }
16 
17     @Override
18     public void requestInitialized(ServletRequestEvent sre) {
19         System.out.println("======requestInitialized========");
20         
21     }
22 
23    
24 }