Learn Java for Web Development

252 CHAPTER 5: Building Java Web Applications with Spring Web MVC

A new controller, AddBookController, is added that takes care of all the form processing using
annotations. Listing 5-46 illustrates the AddBookController.

Listing 5-46. AddBookController for Form Processing

1. package com.apress.bookstore.controller;


2. 
   


3. import java.util.List;


4. 
   


5. import org.springframework.stereotype.Controller;


6. import org.springframework.ui.ModelMap;


7. import org.springframework.validation.BindingResult;


8. import org.springframework.web.bind.WebDataBinder;


9. import org.springframework.web.bind.annotation.InitBinder;


10. import org.springframework.web.bind.annotation.ModelAttribute;


11. import org.springframework.web.bind.annotation.RequestMapping;


12. import org.springframework.web.bind.annotation.RequestMethod;


13. import org.springframework.web.bind.support.SessionStatus;


14. import org.springframework.web.context.request.WebRequest;


15. 
    


16. import com.apress.bookstore.model.Author;


17. import com.apress.bookstore.model.Book;


18. import com.apress.bookstore.service.AuthorService;


19. import com.apress.bookstore.service.BookService;


20. 
    


21. @Controller


22. @RequestMapping("/addBook.html")


23. public class AddBookController {


24. @RequestMapping(value="/addBook.html", method = RequestMethod.GET)


25. public String initForm(ModelMap model) {


26. Book book = new Book();


27. book.setBookTitle("Add Book :");


28. model.addAttribute("book", book);


29. return "addBook";


30. }


31. 
    


32. @InitBinder


33. public void initBinder(WebDataBinder binder, WebRequest request) {


34. binder.setDisallowedFields(new String[] {"author"});


35. Book book = (Book)binder.getTarget();


36. AuthorService authorService = new AuthorService();


37. Long authorId = null;


38. try {


39. authorId = Long.parseLong(request.getParameter("author"));


40. } catch (Exception e) {}


41. if (authorId != null) {


42. Author author = authorService.getAuthorById(authorId);


43. book.setAuthor(author);


44. }


45. }


46.