import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;public class SessionCounter
implements HttpSessionListener
{ private static int activeSessions = 0; public SessionCounter()
{
} public void sessionCreated(HttpSessionEvent se)
{
activeSessions++;
} public void sessionDestroyed(HttpSessionEvent se)
{
if(activeSessions > 0)
activeSessions--;
} public static int getActiveSessions()
{
return activeSessions;
}}在web.xml中,加上这一段:<listener>
<listener-class>SessionCounter</listener-class>
</listener>
import javax.servlet.http.HttpSessionListener;public class SessionCounter
implements HttpSessionListener
{ private static int activeSessions = 0; public SessionCounter()
{
} public void sessionCreated(HttpSessionEvent se)
{
activeSessions++;
} public void sessionDestroyed(HttpSessionEvent se)
{
if(activeSessions > 0)
activeSessions--;
} public static int getActiveSessions()
{
return activeSessions;
}}在web.xml中,加上这一段:<listener>
<listener-class>SessionCounter</listener-class>
</listener>
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