Building Java Web Applications with Spring Web MVC - Learn Java for Web Development - page 247

10. public class BookController {
11. @RequestMapping(method = RequestMethod.GET)
12. public ModelAndView bookListController() {
13. BookService bookManager = new BookService();
14. ModelAndView modelAndView = new ModelAndView("bookList");
15. modelAndView.addObject("bookList", bookManager.getBookList());
16. return modelAndView;
17. }
18. }
 Line 8 : In an annotations-based application, a form controller is created using
@Controller. @Controller indicates that a particular class serves the role of
a controller. @Controller also allows for autodetection, aligned with Spring's
general support for detecting the component classes in the class path and
autoregistering bean definitions for them. In this example, the @Controller
annotation indicates that the BookListControler class is a controller class.
 Line 9 : @RequestMapping is used to map URLs such as /list_book.html onto an
entire class or a particular handler method. @RequestMapping on the class level
indicates that all handling methods on this controller are relative to the
/list_book.html path.
 Line 13 : @RequestMapping on the method level indicates that the method accepts
only GET requests; in other words, an HTTP GET for /list_book.html involves
bookListController() .
Listing 5-45 illustrates the modified bookstore-servlet.xml to have the annotations-based
BookController discovered.
Listing 5-45. bookstore-servlet.xml to Support Annotations-Based Controller
1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans:beans xmlns=" http://www.springframework.org/schema/mvc "
3. xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance " xmlns:beans=
" http://www.springframework.org/schema/beans "
4. xmlns:context=" http://www.springframework.org/schema/context "
5. xsi:schemaLocation=" http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
6. http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
7. http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd " >
8.
9. <!-- DispatcherServlet Context: defines this servlet's request-processing
10. infrastructure -->
11.
12. <context:component-scan base-package="com.apress.bookStore.controller" />
13. <beans:bean name="/list_book.html"
14. class="com.apress.bookstore.controller.BookController" />
15.
16.
17. <!-- Resolves views selected for rendering by @Controllers to .jsp resources
18. in the /WEB-INF/views directory -->