Session in java servlet

Question

I would like to do the servlet program for the below,"create a servlet named com.SessServlet.If you are accessing the servlet in a new browser then for the first time it should display 'Welcome, Newcomer'. When you refresh the same page it should display'Welcome Back. You are visiting the page for <no of times you have refreshed the page> '."

`package com.SessServlet122;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessServlet extends HttpServlet
{

public void service(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
{
    res.setContentType("text/html");
    int i;
    PrintWriter pw=res.getWriter();
    HttpSession hs=req.getSession();
    i=0;
    if(hs.isNew())
    {

        pw.println("Hello:::"+i);
    }
    else
    {    i++;
        pw.println("Welcome Back:Ur entry count is::::"+i);
    }

    pw.close();
}
}`

But this code is not working properly. How to solve this? Thanks in advance.

Answer 1

You should store that counter as a sessionVariable , that way you will get it work.
You need this line after your pw.close(); call:

hs.setAttribute("counter", i);

Also, the initialization of your counter i should look like this:

Integer i = (Integer)hs.getAttribute("counter");
if (i == null)
    i = 0;

Answer 2

Hint:

• Create a Servlet
• From service() method retrieve session and set an attribute in session if its there else set ans display appropriate message
• On jsp use JSTL to display the counter, for example : if the attribute set was hitCount then on jsp use ${hitCount}