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Listing 8-1. The Eshop Files css eshop.css images 1.gif, 2.gif, 3.gif, 4.gif, 5.gif, 6.gif bg_header.gif bg_menu.gif cart.gif jsp BookDetails.jsp Checkout.jsp LeftMenu.jsp OrderConfirmation.jsp SearchOutcome.jsp SelectCatalog.jsp ShoppingCart.jsp TopMenu.jsp META-INF MANIFEST.MF WEB-INF web.xml classes eshop ShopServlet.class ShopServlet.java beans Book.class, Book.java CartItem.class, CartItem.java Category.class, Category.java Customer.class, Customer.java model BookPeer.class, BookPeer.java CategoryPeer.class, CategoryPeer.java DataManager.class, DataManager.java OrderDetailsPeer.class, OrderDetailsPeer.java OrderPeer.class, OrderPeer.java shop.sql To complete the description of the ShopServlet class, we need to show you how it selects the appropriate JSP page on the basis of the request, thereby fulfilling its role as a controller. Listing 8-2 shows the code of the doPost method (as we mentioned already in 1, doGet simply executes doPost).

Note that it is possible that the user explicitly clicked the login link to go to the login page instead of being redirected to here. In that case, there is no original view ID (null), so you ll just return loggedIn as the outcome as usual. Then the navigation system will send the user to the catalog page. If there is indeed an original view ID, you ll use it to load the view root and set it as the current view root. In that case, because you have set the view root yourself, you must tell the navigation system to not change the view root again. This is done by returning null as the outcome. Now, start a new session, and run it again. Try to check out without logging in. The application should display the login page. Then it will return you to the confirm page once you have logged in. Then start a new session, but this time log in from the catalog page. It should then return you to the catalog page.

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Listing 8-2. ShopServlet.java doPost Method protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String base = "/jsp/"; String url = base + "index.jsp"; String action = request.getParameter("action"); if (action != null) { if (action.equals("search")) url = base + "SearchOutcome.jsp"; else if (action.equals("selectCatalog")) url = base + "SelectCatalog.jsp"; else if (action.equals("bookDetails")) url = base + "BookDetails.jsp"; else if (action.matches("(showCart|(add|update|delete)Item)")) url = base + "ShoppingCart.jsp"; else if (action.equals("checkOut")) url = base + "Checkout.jsp"; else if (action.equals("orderConfirmation")) url = base + "OrderConfirmation.jsp"; } RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher(url); requestDispatcher.forward(request, response); } As you can see, doPost obtains the request parameter named action and then uses it to form the correct URL of the JSP page. It then uses the request dispatcher obtained from the servlet context to forward control to the page. If no action parameter exists or if it doesn t match any of the expected strings, the servlet will execute the default page (/jsp/index.jsp). To cover the Eshop functionality in detail, we ll show you what happens in a typical user session, as we already did in 2. This time, though, instead of showing it from the point of view of the user, we ll look at the behavior of the application on the server. The architecture of Eshop is consistent with the general MVC architecture shown in Figure 1-7.

appropriate live addresses; otherwise, these messages will pile up, unread, in root s mailbox on the server. Application log files are typically kept either in a subdirectory of the application itself, such as var/ or log/, or in /var/log/, which is the location of the main system logs. Log files tend to be flat files, with one or more physical lines per record, but larger systems may use database tables instead.

Suppose that you d like to allow the user to log out by clicking a Logout link, as shown in Figure 4-29.

The user starts the application by typing http://localhost:8080/eshop/shop/ in her browser. The doGet method of ShopServlet is executed, and that simply executes doPost. The doPost method, as we just said, doesn t find a request parameter named action, so it forwards the request to index.jsp. The index.jsp page, like all other pages of Eshop, displays a header with a link to the shopping cart and a menu on the left-hand side with search and selection controls. It does so by including two separate modules, as follows: <jsp:include page="TopMenu.jsp" flush="true"/> <jsp:include page="LeftMenu.jsp" flush="true"/> The central area of the page only displays the text welcome to e-Shop.

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