CatalogServlet.java

 

 /*
  *
  * 
  */
 
 import java.io.*;
 import java.util.*;
 import javax.servlet.*;
 import javax.servlet.http.*;
 
 import database.*;
 import cart.*;
 import util.Currency;
 import exception.*;
 
 /**
  * Respond 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("<html>" +
                     "<head><title>" + messages.getString("TitleBookCatalog") + "</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\">" + messages.getString("CartAdded1") + 
                						"<i>" + book.getTitle() + "</i> " + 
                           messages.getString("CartAdded2") + "</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") +
                         "\">" + messages.getString("CartCheck") + "</a>&nbsp;&nbsp;&nbsp;" +
                         "<a href=\"" +
                         response.encodeURL(request.getContextPath() + "/cashier") +
                         "\">" + messages.getString("Buy") + "</a>" +
                         "</p></strong>");
         }
 
         // Always prompt the user to buy more -- get and show the catalog
         out.println("<br> &nbsp;" +
                     "<h3>" + messages.getString("Choose") + "</h3>" +
                     "<center> <table>");
 
           
          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("<tr>" +
 
                            "<td bgcolor=\"#ffffaa\">" +
                            "<a href=\"" +
                            response.encodeURL(request.getContextPath() + "/bookdetails?bookId=" + bookId) +
                            "\"> <strong>" + book.getTitle() +
                            "&nbsp; </strong></a></td>" +
 
                            "<td bgcolor=\"#ffffaa\" rowspan=2>" +
                            c.getFormat() +
                            "&nbsp; </td>" +
 
                            "<td bgcolor=\"#ffffaa\" rowspan=2>" +
                            "<a href=\"" +
                            response.encodeURL(request.getContextPath() + "/catalog?bookId=" + bookId)
                            + "\"> &nbsp;" + messages.getString("CartAdd") + "&nbsp;</a></td></tr>" +
 
                            "<tr>" +
                            "<td bgcolor=\"#ffffff\">" +
                            "&nbsp; &nbsp;" + messages.getString("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.";
 
     }
 }