Shopping Cart
<% if (ACTION_ADD.equals(request.getParameter(KEY_ACTION))) {
%>
You have just added a Book to the cart.
<%
}
%>
A
Shopping Cart contains
Books that are persistent objects.
Shopping Cart itself, however, is
not a persistent object.
Shopping Cart is an in-memory data structure to hold the Books in the current web session and transfer
it to the server when a Purchase Order is to be placed.
<%
OpenBookService service = (OpenBookService)session.getAttribute(KEY_SERVICE);
Customer customer = (Customer)session.getAttribute(KEY_USER);
ShoppingCart cart = (ShoppingCart)session.getAttribute(KEY_CART);
if (ACTION_ADD.equals(request.getParameter(KEY_ACTION))) {
String isbn = request.getParameter(KEY_ISBN);
Book book = (Book)session.getAttribute(isbn);
cart.addItem(book, 1);
}
if (cart.isEmpty()) {
%>
<%= customer.getName() %>, your Shopping Cart is empty.
Continue Shopping
<%
return;
}
%>
<%= cart.getTotalCount() %> Book<%= cart.getTotalCount() == 1 ? "" : "s" %> in
<%= customer.getName() %>'s Shopping Cart
| Title |
Price |
Quantity |
| Continue Shopping |
|
<%
Map books = cart.getItems();
int i = 0;
for (Book b : books.keySet()) {
%>
| <%= b.getTitle() %> |
<%= JSPUtility.format(b.getPrice()) %> |
<%= books.get(b) %> |
<%
}
%>