import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionSnoop extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
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 "snoop.count".
Integer count = (Integer)session.getValue("snoop.count");
if (count == null)
count = new Integer(1);
else
count = new Integer(count.intValue() + 1);
session.putValue("snoop.count", count);
out.println("SessionSnoop");
out.println("Session Snoop
");
// Display the hit count for this page
out.println("You've visited this page " + count +
((count.intValue() == 1) ? " time." : " times."));
out.println("");
out.println("
Here is your saved session data:
");
String[] names = session.getValueNames();
for (int i = 0; i < names.length; i++) {
out.println(names[i] + ": " + session.getValue(names[i]) + "
");
}
out.println("Here are some vital stats on your session:
");
out.println("Session id: " + session.getId() + "
");
out.println("New session: " + session.isNew() + "
");
out.println("Creation time: " + session.getCreationTime());
out.println("(" + new Date(session.getCreationTime()) + ")
");
out.println("Last access time: " + session.getLastAccessedTime());
out.println("(" + new Date(session.getLastAccessedTime()) +
")
");
out.println("Requested session ID from cookie: " +
req.isRequestedSessionIdFromCookie() + "
");
out.println("Requested session ID from URL: " +
req.isRequestedSessionIdFromUrl() + "
");
out.println("Requested session ID valid: " +
req.isRequestedSessionIdValid() + "
");
out.println("Here are all the current session IDs");
out.println("and the times they've hit this page:
");
HttpSessionContext context = session.getSessionContext();
Enumeration ids = context.getIds();
while (ids.hasMoreElements()) {
String id = (String)ids.nextElement();
out.println(id + ": ");
HttpSession foreignSession = context.getSession(id);
Integer foreignCount =
(Integer)foreignSession.getValue("snoop.count");
if (foreignCount == null)
out.println(0);
else
out.println(foreignCount.toString());
out.println("
");
}
out.println("Test URL Rewriting
");
out.println("Click here");
out.println("to test that session tracking works via URL");
out.println("rewriting even when cookies aren't supported.");
out.println("");
}
}