Learn Java for Web Development

116 CHAPTER 3: Best Practices in Java EE Web Development

11.import com.apress.chapter03.model.Author;
12.import com.apress.chapter03.model.Book;
13.
14.public class BookController extends HttpServlet {
15.
16.protected void doGet(HttpServletRequest request,
17.HttpServletResponse response) throws ServletException, IOException {
18.Book book = new Book();
19.book.setBookTitle("Learning Java Web");
20.Author author = new Author();
21.author.setName("Vishal Layka");
22.book.setAuthor(author);
23.
24.request.setAttribute("bookAttrib", book);
25.
26.RequestDispatcher view = request.getRequestDispatcher("/book.jsp");
27.view.forward(request, response);
28.}
29.
30.}

Listing 3-11 is the controller part of the MVC pattern. As you learned in Listing 3-2, the separation
of the view concern from the business-logic concern depends on the attributes. Hence, you have
to save the model object into the attributes for the view (JSP) to be able to access the model via
attributes.

   Lines 19 to 22: In these lines you set the bookTitle and author properties of

Book. Note that the name property of Author is already set on line 21.

   Line 22: This sets the author property of book.

   Line 24: This sets the Book object as an attribute in the request.

   Lines 26 to 27: Line 26 should now be familiar to you. In this line, you dispatch

the request to book.jsp.

Listing 3-12 provides the deployment descriptor for this application.

Listing 3-12. web.xml

1.<?xml version="1.0" encoding="UTF-8"?>
2.<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

3. xmlns="http://java.sun.com/xml/ns/javaee"


4. xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"


5. xsi:schemaLocation="http://java.sun.com/xml/ns/javaee


6. http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
   7.chapter03
   8.
   9.BookController
   10.com.apress.chapter03.controller.BookController
   11.
   12.
   13.BookController