通过session统计访问量

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; } ? ?

} ?