SessionSnoop.java Source code

Java tutorial

  1. HOME
  2. Java
  3. SessionSnoop.java

Introduction

Here is the source code for SessionSnoop.java

Source

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

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();

        Integer count = (Integer) session.getAttribute("count");
        if (count == null)
            count = new Integer(1);
        else
            count = new Integer(count.intValue() + 1);
        session.setAttribute("count", count);

        out.println("<HTML><HEAD><TITLE>Session Count</TITLE></HEAD>");
        out.println("<BODY><H1>Session Count</H1>");

        out.println("You've visited this page " + count + ((count == 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>");
    }
}