Session does not end even when i close browser
when i close firefox/IE the session continues ,What i need is that i am adding amount in shopping cart ,but the amount adds to old amount even when i open a new browser window ,
i hv checked that my browser will remove cookies when i will close mozilla
i hv also printed total=0 in servlet's ini method but the init method is called only once and total does not reset to 0,does 'th the call to init method is made everytime we start a new session via browser ,it does not get called whn i close the current browser and open new one.how to destroy the older servlet?
I m using s=request.getSession()
and s.setAttribute("billamnt",total)
the code of the servlet is
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class addtocart extends HttpServlet
HttpSession s;
PrintWriter pw;
int total,cam,mob;
public void init()
total=0;
cam=0;
mob=0;
System.out.println("inside cart init");
public void service(HttpServletRequest req,HttpServletResponse res) throws IOException
s=req.getSession();
res.setContentType("text/html");
pw=res.getWriter();
pw.println("<html><body><a href="+"mobs"+">Mobile</a><br><a href="+"cams"+">Camera</a><form method = "+"post "+"action ="+"bill"+"><br><input type= "+"submit"+"></form></body></html>");
if(req.getParameter("csony")!=null)
cam=cam+Integer.parseInt(req.getParameter("csony"));
if(req.getParameter("clg")!=null)
cam=cam+Integer.parseInt(req.getParameter("clg"));
if(req.getParameter("cnokia")!=null)
mob=mob+Integer.parseInt(req.getParameter("cnokia"));
if(req.getParameter("cerricson")!=null)
mob=mob+Integer.parseInt(req.getParameter("cerricson"));
s.setAttribute("cambill",new Integer(cam));
s.setAttribute("mobbill",new Integer(mob));
s.setAttribute("billamnt",new Integer(cam+mob));
public void doPost(HttpServletRequest req,HttpServletResponse res)
public void doGet(HttpServletRequest req,HttpServletResponse res)
}Wats the problem?
Message was edited by:
pooja_k_online
The servlet is not created on a session basis. All users share the same servlet object. The servlet is created once when the servlet is first called in the context, then is maintaned until the server shuts down.
You should not store any state in the servlet. You should use the HttpSession object you get from the request object to store the totals, and all other values. You should not use the servlet to hold on to a session object, as multiple users would see the SAME session that way. If you need to use the session in multiple methods, then you should pass that object as parameter, not by making it a class member.
You also shouldn't put the work in the service method of the HttpServlet. You should put it in either the doGet or doPost method (and if you want to make it happen for both type requests, call doPost from the doGet method and put the work in the doPost method).
For example:
public class ShoppingCartServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) {
doPost(request, response);
public void doPost(HttpServletRequest request, HttpServletResponse response) {
HttpSession session = request.getSession();
Integer cambill = (Integer)session.getAttribute("cambill");
int cam = 0;
if(cambill != null) cam = cambill.intValue();
Integer mobbill = (Integer)session.getAttribute("mobbill");
int mob = 0;
if(mobbill != null) mob = mobbill.intValue();
Integer billamnt = (Integer)session.getAttribute("billamnt");
int total = 0;
if(billamnt != null) total = billamnt.intValue();
String csony = request.getParameter("csony");
if (csony != null) cam += Integer.parseInt(csony);
String clg = request.getParameter("clg");
if (clg != null) cam+= Integer.parseInt(clg);
String cnokia = request.getParameter("cnokia");
if (cnokia != null) mob += Integer.parseInt(cnokia);
String cerricson = request.getAttribute("cerricson");
if (cerricson != null) mob += Integer.parseInt(cerricson);
total = cam + mob;
session.setAttribute("cambill",new Integer(cam));
session.setAttribute("mobbill",new Integer(mob));
session.setAttribute("billamnt",new Integer(total));
PrintWriter pw=response.getWriter();
pw.println("<html><body><a href="+"mobs"+">Mobile</a><br><a href="+"cams"+">Camera</a><form method = "+"post "+"action ="+"bill"+"><br><input type= "+"submit"+"></form></body></html>");
pw.close();
}Message was edited by:
stevejluke
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