Servlets - An Introduction to Network Programming with Java - page 246

Fig. 8.8 Weight entry page for simple shopping cart application

When a selection has been made and 'Submit' clicked, the Weight servlet is exe-
cuted. Here is the code for the Weight servlet:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.WebServlet;

@WebServlet("/Weight")
public class Weight extends HttpServlet
{
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException,ServletException
{
HttpSession cart = request.getSession();
String currentProduct =
(String)cart.getAttribute("currentProd");
//Current product ('Apples' or 'Pears') retrieved.
//Note the necessity for a typecast from Object
//into String.