HttpSessionAttributeListener的用法和实例

4）HttpSessionAttributeListener：

HttpSessionAttributeListener能监测到有人正在往HttpSession里添加属性。你可以采取相应的措施。

例 2.2.4.1

package com;

import javax.servlet.http.HttpSessionAttributeListener;

import javax.servlet.http.HttpSessionBindingEvent;

public class MyHttpSessionAttributeListener implements HttpSessionAttributeListener {

public void attributeAdded(HttpSessionBindingEvent arg0) {

System.out.println("增加了" + arg0.getName() + " " +

arg0.getValue() );

}

public void attributeRemoved(HttpSessionBindingEvent arg0) {

System.out.println("去除了" + arg0.getName() + " " +

arg0.getValue() );

}

public void attributeReplaced(HttpSessionBindingEvent arg0) {

System.out.println("取代了" + arg0.getName() + " " +

arg0.getValue()+"现在的新值是"+arg0.getSession().getAttribute(arg0.getName()) );

}

}

web.xml加入下面这段话

<listener>

<listener-class>com.MyHttpSessionAttributeListener</listener-class>

</listener>

更多请看：https://blog.csdn.net/qq_44594371/article/details/103188512