December 2003
Intermediate to advanced
764 pages
24h 58m
English
Content preview from JavaServer Pages, 3rd Edition
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Online Shopping
Now let’s look at a more useful example; an online shopping site. Besides showing you examples on how the session and application scopes can be used effectively in a larger application, this example also introduces other useful tools, such as JSTL actions for number formatting and redirection, and EL syntax for getting collection values based on keys determined at runtime.
The application consists of three pages. The main page lists all available products. Each product is linked to a product description page, where the product can be added to the shopping cart. A product is added to the shopping cart by a request processing page. The main page with the product list is then displayed again, but with the current contents of the shopping cart as well, as shown in Figure 10-7.
 |
Figure 10-7. The product list and the contents of the shopping cart
Two beans are used to keep track of the products: the
com.ora.jsp.beans.shopping.CatalogBean contains
all available products, and the
com.ora.jsp.beans.shopping.CartBean represents one
user’s shopping cart.
Each product in the catalog is represented
by a ProductBean. Table 10-5,
Table 10-6, and Table 10-7 show
all the properties for the beans.
Table 10-5. Properties for com.ora.jsp.beans.shopping.CatalogBean
|
Property name |
Java type |
Access |
Description |
productList |
com.ora.jsp.beans.shopping.ProductBean[] |
Read |
A list of all products ... |
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