package listener; import javax.servlet.ServletContextAttributeEvent; import javax.servlet.ServletContextAttributeListener; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; public class MyListener implements ServletContextListener, ServletContextAttributeListener { //构造函数 public MyListener() { System.out.println("监听器的构造函数!"); } //监听上下文对象的初始化 public void contextInitialized(ServletContextEvent sce) { System.out.println("上下文对象已经初始化!"); } //监听上下文对象的销毁 public void contextDestroyed(ServletContextEvent sce) { System.out.println("上下文对象已经销毁!"); } //监听上下文对象的属性是否添加 public void attributeAdded(ServletContextAttributeEvent scae) { System.out.println("上下文对象添加了一个属性!"); } //监听上下文对象的属性是否删除 public void attributeRemoved(ServletContextAttributeEvent scae) { System.out.println("上下文对象删除了一个属性!"); } //监听上下文对象的属性是否修改 public void attributeReplaced(ServletContextAttributeEvent scae) { System.out.println("上下文对象修改了属性!"); } }
xml配置:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="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_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>ch03</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <listener> <listener-class>listener.MyListener</listener-class> </listener> </web-app>
原文地址:https://www.cnblogs.com/nongzihong/p/10024734.html
时间: 2024-11-05 23:37:46