res.setContentType("text/html");
PrintWriter out = res.getWriter();
// Get the current session object, create one if necessary
HttpSession session = req.getSession(true);
// Increment the hit count for this page. The value is saved
// in this client's session under the name "tracker.count".
Integer count = (Integer)session.getValue("tracker.count");
if (count == null)
count = new Integer(1);
else
count = new Integer(count.intValue() + 1);
session.putValue("tracker.count", count);
out.println("<HTML><HEAD><TITLE>SessionTracker</TITLE></HEAD>");
out.println("<BODY><H1>Session Tracking Demo</H1>");
// Display the hit count for this page
out.println("You've visited this page " + count +
((count.intValue() == 1) ? " time." : " times."));
out.println("<P>");
out.println("<H2>Here is your session data:</H2>");
String[] names = session.getValueNames();
for (int i = 0; i < names.length; i++) {
out.println(names[i] + ": " + session.getValue(names[i]) + "<BR>");
}
out.println("</BODY></HTML>");
