import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ShoppingCartServlet extends HttpServlet
{
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.print("Online Shop"+
"");
out.close();
}
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
String msg;
HttpSession session = req.getSession(true);
if(session.isNew())
{
session.putValue("foo", new int[] { 0 });
session.putValue("bar", new int[] { 0 });
}
int[] foo = (int[])session.getValue("foo");
int[] bar = (int[])session.getValue("bar");
if(req.getParameter("foo") != null)
{
foo[0]++;
msg = "Bought a FOO. You now have "+foo[0]+".";
}
else if(req.getParameter("bar") != null)
{
bar[0]++;
msg = "Bought a BAR. You now have "+bar[0]+".";
}
else if(req.getParameter("buy") != null)
{
session.invalidate();
msg = "Your order for "+foo[0]+" FOOs and "+bar[0]+
" BARs has been accepted. Your shopping cart is empty now.";
}
else
{
msg = "You have "+foo[0]+" FOOs and "+bar[0]+
" BARs in your shopping cart.";
}
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.print("Shopping Cart");
out.print(msg);
out.print("
Back to the shop");
out.close();
}
public String getServletInfo()
{
return "ShoppingCartServlet 1.0 by Stefan Zeiger";
}
}