sessioncounter.java

J2EE独立开发制作

package SessionCount;  
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;  
}  
}