java code for Session logger

//Log4j from Apache is required


import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

import javax.servlet.*;
import javax.servlet.http.*;

public class SessionLogger implements HttpSessionListener {

private Logger log;

public SessionLogger() {

/*
* The loggers are typically initialized by a special initialization
* listener or servlet. If this is not the case, then initialize the
* logger here:
*
* java.util.ResourceBundle bundle = java.util.ResourceBundle.getBundle(
* "com.java2s.global");
* PropertyConfigurator.configure(bundle.getString(
* "log-configure-path"));
*/

log = Logger.getLogger(SessionLogger.class);

}

public void sessionCreated(HttpSessionEvent se) {

//log request of the INFO level
log.info("HttpSession created: " + se.getSession().getId());

}

public void sessionDestroyed(HttpSessionEvent se) {

//log request about session's that are invalidated
log.info("HttpSession invalidated: " + se.getSession().getId());

}

}