Java中HttpSessionAttributeListener监听器的示例
下文笔者将讲述HttpSessionAttributelistener监听器的相关示例说明，如下所示:
例
HttpSessionAttributeListener的功能:
用于对session的属性(添加，删除，替换)进行监听
HttpSessionAttributeListener中的方法
| public void attributeAdded(HttpSessionBindingEvent se);//增加属性 |
| public void attributeRemoved(HttpSessionBindingEvent se);//删除属性 |
| public void attributereplaced(HttpSessionBindingEvent se);//替换属性 |
| //HttpSessionBindingEvent事件： |
| public String getName();//取得属性的名称 |
| public Object getValue();//取得属性的值 |
| public HttpSession getSession();//取得当前的session |
//MyAttributeListener.java
package com.java265;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
public class MyAttributeListener implements HttpSessionAttributeListener {
@Override
public void attributeAdded(HttpSessionBindingEvent event) {
String attributeName = event.getName();
Object attributeValue = event.getValue();
System.out.println("HttpSessionAttributeListener Attribute added : " + attributeName + " : "
+ attributeValue);
}
@Override
public void attributeRemoved(HttpSessionBindingEvent event) {
String attributeName = event.getName();
Object attributeValue = event.getValue();
System.out.println("HttpSessionAttributeListener Attribute removed : " + attributeName + " : "
+ attributeValue);
}
@Override
public void attributeReplaced(HttpSessionBindingEvent event) {
String attributeName = event.getName();
Object attributeValue = event.getValue();
System.out.println("Attribute replaced : " + attributeName + " : "
+ attributeValue);
}
}
//web.xml配置监听器
<listener>
<listener-class>com.java265.MyAttributeListener</listener-class>
</listener>
//test.jsp
<html>
<body>
<%
session = request.getSession();
session.setAttribute("webAdd", "java265.com");
session.setAttribute("name", "java爱好者");
session.removeAttribute("name")
%>
</body>
</html>
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