import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out = res.getWriter();
HttpSession session = req.getSession();
Integer count = (Integer)session.getAttribute("snoop.count");
if (count == null)
count = new Integer(1);
else
count = new Integer(count.intValue() + 1);
session.setAttribute("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>");
Enumeration e = session.getAttributeNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
out.println(name + ": " + session.getAttribute(name) + "<BR>");
}
out.println("<H3>Here are some vital stats on your session:</H3>");
out.println("Session id: " + session.getId() +
" <I>(keep it secret)</I><BR>");
out.println("New session: " + session.isNew() + "<BR>");
out.println("Timeout: " + session.getMaxInactiveInterval());
out.println("<I>(" + session.getMaxInactiveInterval() / 60 +
" minutes)</I><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>Test URL Rewriting</H3>");
out.println("Click <A HREF=\"" +
res.encodeURL(req.getRequestURI()) + "\">here</A>");
out.println("to test that session tracking works via URL");
out.println("rewriting even when cookies aren't supported.");
out.println("</BODY></HTML>");
}
}
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<servlet><servlet-name>MyServletName</servlet-name>
<servlet-class>MyServlet</servlet-class>
</servlet>
<servlet-mapping><servlet-name>MyServletName</servlet-name>
<url-pattern>/index.html</url-pattern>
</servlet-mapping>
</web-app>
Download: ServletSessionSnoop.zip( 90 k)