//java 代码
public class SessionCounter implements HttpSessionListener { private static int activeSessions = 0;
//session创建时执行
public void sessionCreated(HttpSessionEvent se) {
activeSessions++;
}
//session销毁时执行
public void sessionDestroyed(HttpSessionEvent se) {
if (activeSessions > 0)
activeSessions--;
}
//获取活动的session个数(在线人数)
public static int getActiveSessions() {
return activeSessions;
} }
//web.xml添加配置
<listener>
<listener-class>com.java.webutils.SessionListener</listener-class>
</listener>
//jsp页面编写
<%@ page import="com.my.count.SessionCounter"%>
<body>
在线人数为:<%=SessionCounter.getActiveSessions()%>
</body>