Best Practices in Java EE Web Development - Learn Java for Web Development - page 113

9.return bookTitle;
10.}
11.
12.public void setBookTitle(String bookTitle) {
13.this.bookTitle = bookTitle;
14.}
15.
16.public Author getAuthor() {
17.return author;
18.}
19.
20.public void setAuthor(Author author) {
21.this.author = author;
22.}
23.
24.}
The goal of the application is to show how to access the property of an attribute (the bookTitle property
of Book in Figure 3-5 ) and the property of an attribute that is itself a property of the attribute (the name
property of Author in Figure 3-5 ). In Figure 3-5 ,you need to output the value of the name property of
the Author . It is not possible to do this using JSP standard actions, as you will see later in this section,
and in such cases, scriptlets have been used. This is how scriptlets found their way into JSP. However,
you should not use scriptlets because with the scriptlets (Java code) intermingled in the presentation
code (JSP); the business logic cross-cuts the presentation concern, resulting in unmaintainable JSP, as
explained earlier in Listing 3-4. Because JSP standard actions cannot access properties of an attribute
that is itself a property of an attribute and because using scriptlets results in unmaintainable JSPs, you
should use EL. In this section, you will learn how to use EL with the help of an example where Author
class is the property of the Book class. Figure 3-5 shows the relationship between Book and Author .
You will access the name property of Author from Book without using scriptlets.
Listing 3-9 illustrates the Author object with a single property called name with getters and setters.
You need to output the value of the name property of Author .
Listing 3-10 illustrates the Book object with two properties, bookTitle and author , and their getters
and setters. The author property in Book is the Author class, illustrated earlier in Listing 3-9. You
need to access the name property of the author property.
The Book and Author objects serve as the model of the MVC application. Listing 3-11 illustratesthe
controller of the application.
Listing 3-11. BookController.java
1.package com.apress.chapter03.controller;
2.
3.import java.io.IOException;
4.
5.import javax.servlet.RequestDispatcher;
6.import javax.servlet.ServletException;
7.import javax.servlet.http.HttpServlet;
8.import javax.servlet.http.HttpServletRequest;
9.import javax.servlet.http.HttpServletResponse;
10.