Jsp學習筆記之session的兩個監聽器

當我們需要監聽會話的時候

1.建立我們實現的類

代碼如下

複製代碼

package org.Rudiment.Listener; import javax.servlet.http.HttpSessionAttributeListener; import javax.servlet.http.HttpSessionBindingEvent; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener; public class MySessionListener implements HttpSessionListener, HttpSessionAttributeListener {     @Override     public void sessionCreated(HttpSessionEvent arg0) {         System.out.println("新會話建立" + arg0.getSession().getId());     }     @Override     public void sessionDestroyed(HttpSessionEvent arg0) {         System.out.println("有一個會話被銷毀了"  + arg0.getSession().getId());     }     @Override     public void attributeAdded(HttpSessionBindingEvent arg0) {         System.out.println("會話:" + arg0.getSession().getId()                 + "中新增加了一個參數:" + arg0.getName()                 + " 其數值為:" + arg0.getValue());     }     @Override     public void attributeRemoved(HttpSessionBindingEvent arg0) {         System.out.println("會話:" + arg0.getSession().getId()                 + "中刪除了一個參數:" + arg0.getName()                 + " 其數值為:" + arg0.getValue());     }     @Override     public void attributeReplaced(HttpSessionBindingEvent arg0) {         System.out.println("會話:" + arg0.getSession().getId()                 + "中新一個參數:" + arg0.getName()                 + " 數值更新為:" + arg0.getValue());     } }

2.在 web.xml 中配置我們監聽器

代碼如下	複製代碼
<listener>     <listener-class>org.Rudiment.Listener.MySessionListener</listener-class> </listener>