Listener

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web.xml中注册监听器<listener><listener-class>cn.itcast.web.listener.MyServletContextListener</listener-class></listener>

import java.util.Date;import javax.servlet.http.HttpSession;import javax.servlet.http.HttpSessionEvent;import javax.servlet.http.HttpSessionListener;//监听器[用于监听HttpSesison产生和销毁]public class MyHttpSessionListener implements HttpSessionListener {//产生public void sessionCreated(HttpSessionEvent se) {HttpSession session = se.getSession();System.out.println(session.getId());System.out.println("sessionCreated()" + new Date().toLocaleString());}//销毁public void sessionDestroyed(HttpSessionEvent se) {HttpSession session = se.getSession();System.out.println(session.getId());System.out.println("sessionDestroyed()");System.out.println("sessionCreated()" + new Date().toLocaleString());}}

import javax.servlet.ServletContextAttributeEvent;import javax.servlet.ServletContextAttributeListener;import javax.servlet.ServletRequestAttributeEvent;import javax.servlet.ServletRequestAttributeListener;import javax.servlet.http.HttpSessionAttributeListener;import javax.servlet.http.HttpSessionBindingEvent;//监听器[用于监听属性变化情况]public class AttributeListener implements ServletContextAttributeListener,HttpSessionAttributeListener ,ServletRequestAttributeListener{public void attributeAdded(ServletContextAttributeEvent scab) {System.out.println("属性增加");String name = scab.getName();String value = (String) scab.getValue();System.out.println(name+":"+value);}public void attributeReplaced(ServletContextAttributeEvent scab) {System.out.println("属性修改");String name = scab.getName();String value = (String) scab.getValue();System.out.println(name+":"+value);}public void attributeRemoved(ServletContextAttributeEvent scab) {System.out.println("属性删除");String name = scab.getName();String value = (String) scab.getValue();System.out.println(name+":"+value);}public void attributeAdded(HttpSessionBindingEvent se) {System.out.println("属性增加");String name = se.getName();String value = (String) se.getValue();System.out.println(name+":"+value);}public void attributeReplaced(HttpSessionBindingEvent se) {System.out.println("属性修改");String name = se.getName();String value = (String) se.getValue();System.out.println(name+":"+value);}public void attributeRemoved(HttpSessionBindingEvent se) {System.out.println("属性删除");String name = se.getName();String value = (String) se.getValue();System.out.println(name+":"+value);}public void attributeAdded(ServletRequestAttributeEvent srae) {System.out.println("属性增加");String name = srae.getName();String value = (String) srae.getValue();System.out.println(name+":"+value);}public void attributeReplaced(ServletRequestAttributeEvent srae) {System.out.println("属性修改");String name = srae.getName();String value = (String) srae.getValue();System.out.println(name+":"+value);}public void attributeRemoved(ServletRequestAttributeEvent srae) {System.out.println("属性删除");String name = srae.getName();String value = (String) srae.getValue();System.out.println(name+":"+value);}}

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