In this EJB Stateful Bean tutorial, we will write the client code to consume the stateful session bean. Then, we will do a test run to see Shopping Carts are different for two different browser sessions (Two Clients).
ShoppingCart.Jsp Version 2
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<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!-- Sample 2.5: Java Objects used here. We already have Project Dependancy set as part of previous stateless bean demo --> <%@ page import="tube.codingexamples.ejb.statefulbean.ShoppingCartRemote" %> <%@ page import="javax.naming.InitialContext" %> <%@ page import="java.util.ArrayList" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <!-- Sample 2.6: Html Form to Collect Input --> <form action="ShoppingCart.jsp" method="post"> Place Item into Shopping Cart: <input type="text" size=35 value="" name="Purchased" /> <input type="submit" value="Add to Cart" name="CartAction"/> <input type="submit" value="Remove From Cart" name="CartAction" /> <input type="submit" value="List items in Cart" name="CartAction"/> <input type="submit" value="Empty Cart" name="CartAction" /> </form> <% //Sample 2.7: Get ShoppingCart from the Session Attribute, //if not create the bean on server ShoppingCartRemote cart = (ShoppingCartRemote) session.getAttribute("sessionShoppingCart"); if(cart == null) { InitialContext ct = new InitialContext(); ShoppingCartRemote scart = (ShoppingCartRemote) ct.lookup( "java:global/EJBEar/EJBBean/ShoppingCart!tube.codingexamples." + "ejb.statefulbean.ShoppingCartRemote"); session.setAttribute("sessionShoppingCart", scart); } //Sample 2.8: Get the input strings String item = request.getParameter("Purchased"); String CartAction = request.getParameter("CartAction"); //Sample 2.9: Now Perform the Action if (CartAction != null) { if(CartAction.equalsIgnoreCase("Add to Cart")) { cart.placeProduct(item); out.println("<h3> " + item + " added to the cart </h3>"); } if(CartAction.equalsIgnoreCase("Remove From Cart")) { cart.removeProduct(item); out.println("<h3> " + item + " removed to the cart </h3>"); } if(CartAction.equalsIgnoreCase("List items in Cart")) { out.println("<h3> List of Items in the Cart </h3>"); out.println("<ol>"); ArrayList<String> items = cart.listCartItems(); for(String CartItem: items) { out.println("<li>"); out.println(CartItem); out.println("</li>"); } out.println("</ol>"); } if(CartAction.equalsIgnoreCase("Empty Cart")) { cart.clearCart(); out.println("<h3> Cart is Empty</h3>"); } } %> </body> </html> |
Categories: JavaEE-EJB-Tube
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