Java Reference
In-Depth Information
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.<display-name>chapter03</display-name>
8.<servlet>
9.<servlet-name>BookController</servlet-name>
10.<servlet-class>com.apress.chapter03.controller.BookController</servlet-class>
11.</servlet>
12.<servlet-mapping>
13.<servlet-name>BookController</servlet-name>
 
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