/*
*
* Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.*;
import cart.*;
import util.Currency;
import exception.*;
/**
* This is a simple example of an HTTP Servlet. It responds to the GET
* method of the HTTP protocol.
*/
public class CatalogServlet extends HttpServlet {
private BookDB bookDB;
public void init() throws ServletException {
bookDB =
(BookDB)getServletContext().getAttribute("bookDB");
if (bookDB == null)
throw new UnavailableException("Couldn't get database.");
}
public void destroy() {
bookDB.remove();
bookDB = null;
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the user's session and shopping cart
HttpSession session = request.getSession(true);
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
// If the user has no cart, create a new one
if (cart == null) {
cart = new ShoppingCart();
session.setAttribute("cart", cart);
}
// set content-type header before accessing the Writer
response.setContentType("text/html");
response.setBufferSize(8192);
PrintWriter out = response.getWriter();
// then write the data of the response
out.println("" +
"" + messages.getString("TitleBookCatalog") + "");
// Get the dispatcher; it gets the banner to the user
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/banner");
if (dispatcher != null)
dispatcher.include(request, response);
//Information on the books is from the database through its front end
// Additions to the shopping cart
String bookId = request.getParameter("bookId");
if (bookId != null) {
try {
BookDetails book = bookDB.getBookDetails(bookId);
cart.add(bookId, book);
out.println("" + "" + messages.getString("CartAdded1") +
"" + book.getTitle() + " " +
messages.getString("CartAdded2") + "
");
} catch (BookNotFoundException ex) {
response.reset();
throw new ServletException(ex);
}
}
//Give the option of checking cart or checking out if cart not empty
if (cart.getNumberOfItems() > 0) {
out.println("" + messages.getString("CartCheck") + " " +
"" + messages.getString("Buy") + "" +
"
");
}
// Always prompt the user to buy more -- get and show the catalog
out.println("
" +
"" + messages.getString("Choose") + "
" +
" ");
try {
Collection coll = bookDB.getBooks();
Iterator i = coll.iterator();
Currency c = (Currency)session.getAttribute("currency");
if (c == null) {
c = new Currency();
c.setLocale(request.getLocale());
session.setAttribute("currency", c);
}
while (i.hasNext()) {
BookDetails book = (BookDetails)i.next();
bookId = book.getBookId();
c.setAmount(book.getPrice());
//Print out info on each book in its own two rows
out.println("" +
"| " +
" " + book.getTitle() +
" | " +
"" +
c.getFormat() +
" | " +
"" +
" " + messages.getString("CartAdd") + " |
" +
"" +
"| " +
" " + messages.getString("By") + " " + book.getFirstName() +
" " + book.getSurname() + " |
");
}
} catch (BooksNotFoundException ex) {
response.reset();
throw new ServletException(ex);
}
out.println("