PROGRAM:
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();
HttpSession
session = req.getSession(true);
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("<HTML><HEAD><TITLE>SessionSnoop</TITLE></HEAD>");
out.println("<BODY><H1>Session
Snoop</H1>");
out.println("You've
visited this page " + count +
((count.intValue() == 1) ? " time."
: " times."));
out.println("<P>");
out.println("<H3>Here is your
saved session data:</H3>");
String[] names = session.getValueNames();
for (int i = 0; i < names.length; i++) {
out.println(names[i] + ": " +
session.getValue(names[i]) + "<BR>");
}
out.println("<H3>Here are some vital stats on your
session:</H3>");
out.println("Session id: " + session.getId() +
"<BR>");
out.println("New session: " + session.isNew() +
"<BR>");
out.println("Creation time: " + session.getCreationTime());
out.println("<I>(" + new Date(session.getCreationTime())
+ ")</I><BR>");
out.println("Last access time: " +
session.getLastAccessedTime());
out.println("<I>(" + new
Date(session.getLastAccessedTime()) +
")</I><BR>");
out.println("Requested session ID from cookie: " +
req.isRequestedSessionIdFromCookie() + "<BR>");
out.println("Requested session ID from URL: " +
req.isRequestedSessionIdFromUrl() + "<BR>");
out.println("Requested session ID valid: " +
req.isRequestedSessionIdValid() + "<BR>");
out.println("<H3>Here are all the current session IDs");
out.println("and the times they've hit this
page:</H3>");
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("<BR>");
}
out.println("</BODY></HTML>");
}
}
