package com.oreilly.jent.servlets;
/**
* In general, you may use the code in this book in your programs and
* documentation. You do not need to contact us for permission unless
* you're reproducing a significant portion of the code. For example,
* writing a program that uses several chunks of code from this book does
* not require permission. Selling or distributing a CD-ROM of examples
* from O'Reilly books does require permission. Answering a question by
* citing this book and quoting example code does not require permission.
* Incorporating a significant amount of example code from this book into
* your product's documentation does require permission.
*
* We appreciate, but do not require, attribution. An attribution usually
* includes the title, author, publisher, and ISBN. For example:
*
* "Java Enterprise in a Nutshell, Third Edition,
* by Jim Farley and William Crawford
* with Prakash Malani, John G. Norman, and Justin Gehtland.
* Copyright 2006 O'Reilly Media, Inc., 0-596-10142-2."
*
* If you feel your use of code examples falls outside fair use or the
* permission given above, feel free to contact us at
* permissions@oreilly.com.
*/
import java.io.IOException;
import java.io.PrintWriter;
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 VisitCounterServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
PrintWriter out = resp.getWriter( );
resp.setContentType("text/html");
HttpSession thisUser = req.getSession(true);
Integer visits;
if(!thisUser.isNew( )) { //Don't check newly created sessions
visits = (Integer)thisUser.getAttribute("visitcounter.visits");
if(visits == null)
visits = new Integer(1);
else
visits = new Integer(visits.intValue( ) + 1);
}
else
visits = new Integer(1);
// Put the new count in the session
thisUser.setAttribute("visitcounter.visits", visits);
// Finally, display the results and give them the session ID too
out.println("<html><head><title>Visit Counter</title></head>");
out.println("<body>You have visited this page " + visits + " time[s]");
out.println("since your last session expired.");
out.println("Your Session ID is " + thisUser.getId( ));
out.println("</body></html>");
}
}
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