Java Reference
In-Depth Information
Line 8
: The action is not
null
, and the value of the action is
category
.
Lines 15 to16
: The helper method
findAllBooks(request, response)
is invoked,
the URL is reconstructed to point to
listOfBooks.jsp
, and
RequestDispatcher
forwards to the view provided to the
RequestDispatcher
in the form of a URL.
Listing 2-37 shows the helper method
findAllBooks(request, response)
in the
BookController
.
Listing 2-37. findAllBooks( ) in BookController
1.private void findAllBooks(HttpServletRequest request,
2.HttpServletResponse response) throws ServletException, IOException {
3.try {
4.BookDAO bookDao = new BookDAOImpl();
5.List<Book> bookList = bookDao.findAllBooks();
6.request.setAttribute("bookList", bookList);
7.
8.} catch (Exception e) {
9.System.out.println(e);
10.}
11.}
Lines 5 to 6
: A 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 Keyword
You can search the books by the author's name or a keyword in the book's title, as illustrated in
Figure
2-39
.
Figure 2-39.
Searching books by keyword