res.setContentType("text/html");
PrintWriter out = res.getWriter();
// Get the current session object, create one if necessary
HttpSession session = req.getSession();
// 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.getAttribute("tracker.count");
if (count == null)
count = new Integer(1);
else
count = new Integer(count.intValue() + 1);
session.setAttribute("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>");
Enumeration enum = session.getAttributeNames();
while (enum.hasMoreElements()) {
String name = (String) enum.nextElement();
out.println(name + ": " + session.getAttribute(name) + "<BR>");
}
out.println("</BODY></HTML>");
