1.编辑监听类:
import javax.servlet.http.HttpSessionListener;
import javax.servlet.http.HttpSessionEvent;
import org.apache.log4j.Logger;
/**
* Session监听器
*/
public class SessionListener implements HttpSessionListener {
private Logger logger=Logger.getLogger(this.getClass());
private long count=0;
public synchronized void sessionCreated(HttpSessionEvent se) {
this.count=this.count+1;
se.getSession().getServletContext().setAttribute("count",this.count+"");
}
public synchronized void sessionDestroyed(HttpSessionEvent se) {
this.count=this.count-1;
se.getSession().getServletContext().setAttribute("count",this.count+"");
}
}
2.注册监听到web.xml:
<web-app>
...
<listener>
<listener-class>com.link2friend.friend.sessionlistener.SessionListener</listener-class>
</listener>
...
</web-app>
3.网页上使用:
<%=application.getAttribute("count")%>
SessionListener统计在线人数
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转载自incomplete808.iteye.com/blog/1627840
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