/*
*
* 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);
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("<html>" +
"<head><title> Book Catalog </title></head>");
// 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("<p><h3>" +
"<font color=\"#ff0000\">" +
"You just added <i>" + book.getTitle() + "</i> "+
"to your shopping cart.</font></h3>");
} 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("<p><strong><a href=\"" +
response.encodeURL(request.getContextPath() + "/showcart") +
"\"> Check Shopping Cart</a> " +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/cashier") +
"\"> Buy Your Books</a>" +
"</p></strong>");
}
// Always prompt the user to buy more -- get and show the catalog
out.println("<br> " +
"<h3>Please choose from our selections:</h3>" +
"<center> <table>");
try {
Collection coll = bookDB.getBooks();
Iterator i = coll.iterator();
Currency curr = new Currency();
curr.setLocale(request.getLocale());
while (i.hasNext()) {
BookDetails book = (BookDetails)i.next();
bookId = book.getBookId();
curr.setAmount(book.getPrice());
//Print out info on each book in its own two rows
out.println("<tr>" +
"<td bgcolor=\"#ffffaa\">" +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/bookdetails?bookId=" + bookId) +
"\"> <strong>" + book.getTitle() +
" </strong></a></td>" +
"<td bgcolor=\"#ffffaa\" rowspan=2>" +
curr.getFormat() +
" </td>" +
"<td bgcolor=\"#ffffaa\" rowspan=2>" +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog?bookId=" + bookId)
+ "\"> Add to Cart </a></td></tr>" +
"<tr>" +
"<td bgcolor=\"#ffffff\">" +
" by <em> " + book.getFirstName() +
" " + book.getSurname() + "</em></td></tr>");
}
} catch (BooksNotFoundException ex) {
response.reset();
throw new ServletException(ex);
}
out.println("</table></center></body></html>");
out.close();
}
public String getServletInfo() {
return "The Catalog servlet adds books to the user's " +
"shopping cart and prints the catalog.";
}
}