Using the HttpSession Object: Servlet and JSP Tutorials J2EE

Published: 04 August 2008
on channel: javaprogrammingcbts

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State Management and the HttpSession

This free, multimedia tutorial shows you how to use IBM's Rational Application Developer (IRAD) 6.0 to create a simple Servlet that takes advantage of the HttpSession object of the Servlet and JSP API. The simple Servlet uses a hitcounter to keep track of the number of times the petulant user refreshes the web page.

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package com.examscam.servlet;

import java.io.IOException;

import javax.servlet.Servlet;
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 SessionServlet extends HttpServlet implements Servlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession(false);
if (session == null){
session = request.getSession(true);
Integer hitCount = new Integer(0);
session.setAttribute("count", hitCount);
}
Integer hitCount = (Integer)session.getAttribute("count");
hitCount = new Integer(hitCount.intValue() + 1);
session.setAttribute("count", hitCount);
response.getWriter().print("Number of times at this page: " + hitCount.intValue());
}
}

http://www.thebookonhibernate.com/j2e...

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http://www.thebookonhibernate.com/j2e...

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