Learn Java for Web Development

96 CHAPTER 2: Building Web Applications Using Servlets and JSP

Listing 2-34 shows the helper method findAllBooks(request, response) in the BookController.

Listing 2-34. findAllBooks( ) in BookController

1.private void findAllBooks(HttpServletRequest request,
2.HttpServletResponse response) throws ServletException, IOException {
3.try {
4.BookDAO bookDao = new BookDAOImpl();
5.List bookList = bookDao.findAllBooks();
6.request.setAttribute("bookList", bookList);
7.
8.} catch (Exception e) {
9.System.out.println(e);
10.}
11.}

   Lines 5 to 6: This list of all books is obtained from the database using the

findAllBooks() method on the DAO and is set as an attribute in the request.

Searching the Books by Category

When the user clicks a specific category on the menu, the list of books in that category is displayed,
as illustrated in Figure 2-38.

Figure 2-38. Searching the book by category