Java Reference
In-Depth Information
30.<td>
31.<s:iterator value="#book.authors" id="author">
32.<s:if test="%{#book.id == #author.bookId}">
33.<s:property value="#author.firstName" />
34.<s:property value="#author.lastName" />
35.</s:if>
36.</s:iterator>
37.</td>
39.<td><s:property value="price" /></td>
40.</tr>
42.</s:iterator>
43.</tbody>
45</table>
47.</center><br>
49.<s:submit value="Add to the shopping cart" />
51.</s:form>
52.
53.</div>
54.</body>
Listing 4-45 illustrates the usage of Struts 2 tags and how Struts 2 OGNL is used to navigate the
property
bookTitle
on line 27 and the properties
firstName
and
lastName
(of the author) on
lines 33 and 34. Line 31 illustrates the usage of a simple and nested
s:iterator
. Line 26 allows the
user to select books to add to the shopping cart. The user can check the books to select and submit
them by clicking the button on line 49. When the user clicks the Add to Cart button, the action
name
selectedbooksLink
on line 8 and the book
Id
on line 26 are sent to the container, which is then
mapped to the
AddToCart
action via
struts.xml
. The
AddToCart
action then stores the book to the cart
in the database, and the
AddToCart
action returns the String
success
, which is mapped via action
mapping in
struts.xml
and the tile in the
tiles.xml
file to the view
selectedBooks.jsp
. The user
can click the Purchase button on the
selectedBooks.jsp
page to call
PurchaseAction
in the same
manner. This chapter sketched a brief overview of Struts 2. For more detailed coverage of Struts 2,
I recommend
Practical Apache Struts 2 Web 2.0 Projects
by Ian Roughley.
Summary
In this chapter, you saw the Struts 2 framework's core components, which follow the MVC design
pattern, and you saw how Struts 2separates the cross-cutting concerns by means of interceptors. You
saw how the Struts 2 framework provides a declarative architecture in two forms: XML and annotations.
In the next chapter, you will learn another action-oriented framework, called Spring Web MVC.
