jsp 实现在线人数统计

首先写个类:

import javax.servlet.*;

import javax.servlet.http.*;

public class SessionCounter implements HttpSessionListener {

private static int activeSessions = 0;

public void sessionCreated(HttpSessionEvent se) {

activeSessions++;

}

public void sessionDestroyed(HttpSessionEvent se) {

if(activeSessions > 0)

activeSessions--;

}

public static int getActiveSessions() {

return activeSessions;

}

}

然后配置web.xml

xmlns=&http://java.sun.com/xml/ns/j2ee&

xmlns:xsi=&http://www.w3.org/2001/XMLSchema-instance&

xsi:schemaLocation=&http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd&>

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SessionCount.SessionCounter (注意此处)

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关键词标签：统计,人数,在线,实现;