📄 showcartservlet.java
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/* * * 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.*;/** * An HTTP servlet that displays the contents of a customer's shopping * cart at Duke's Bookstore. It responds to the GET and HEAD methods of * the HTTP protocol. This servlet calls other servlets. */public class ShowCartServlet 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(); //Print out the response out.println("<html>" + "<head><title>" + messages.getString("TitleShoppingCart") + "</title></head>" ); // Get the dispatcher; it gets the banner to the user RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/banner"); if (dispatcher != null) dispatcher.include(request, response); /* Handle any pending deletes from the shopping cart and indicate the outcome as part of the response */ String bookId =request.getParameter("Remove"); BookDetails bd; if (bookId != null) { try { bd = bookDB.getBookDetails(bookId); cart.remove(bookId); out.println("<font color=\"#ff00000\" size=\"+2\">" + messages.getString("CartRemoved") + "<strong>" + bd.getTitle() + "</strong> <br> <br>" + "</font>"); } catch (BookNotFoundException ex) { response.reset(); throw new ServletException(ex); } } else if (request.getParameter("Clear") != null) { cart.clear(); out.println("<font color=\"#ff0000\" size=\"+2\"><strong>" + messages.getString("CartCleared") + "</strong> <br> <br> </font>"); } // Print a summary of the shopping cart int num = cart.getNumberOfItems(); if (num > 0) { out.println("<font size=\"+2\">" + messages.getString("CartContents") + num + (num==1 ? messages.getString("CartItem") : messages.getString("CartItems")) + "</font><br> "); // Return the Shopping Cart out.println("<table>" + "<tr>" + "<th align=left>" + messages.getString("ItemQuantity") + "</TH>" + "<th align=left>" + messages.getString("ItemTitle") + "</TH>" + "<th align=left>" + messages.getString("ItemPrice") + "</TH>" + "</tr>"); Iterator i = cart.getItems().iterator(); Currency c = (Currency)session.getAttribute("currency"); if (c == null) { c = new Currency(); c.setLocale(request.getLocale()); session.setAttribute("currency", c); } while (i.hasNext()) { ShoppingCartItem item = (ShoppingCartItem) i.next(); bd = (BookDetails) item.getItem(); c.setAmount(bd.getPrice()); out.println("<tr>" + "<td align=\"right\" bgcolor=\"#ffffff\">" + item.getQuantity() + "</td>" + "<td bgcolor=\"#ffffaa\">" + "<strong><a href=\"" + response.encodeURL(request.getContextPath() + "/bookdetails?bookId=" + bd.getBookId()) + "\">" + bd.getTitle() + "</a></strong>" + "</td>" + "<td bgcolor=\"#ffffaa\" align=\"right\">" + c.getFormat() + "</td>" + "<td bgcolor=\"#ffffaa\">" + "<strong>" + "<a href=\"" + response.encodeURL(request.getContextPath() + "/showcart?Remove=" + bd.getBookId()) + "\">" + messages.getString("RemoveItem") + "</a></strong>" + "</td></tr>"); } c.setAmount(cart.getTotal()); // Print the total at the bottom of the table out.println("<tr><td colspan=\"5\" bgcolor=\"#ffffff\">" + "<br></td></tr>" + "<tr>" + "<td colspan=\"2\" align=\"right\"" + "bgcolor=\"#ffffff\">" + messages.getString("Subtotal") + "</td>" + "<td bgcolor=\"#ffffaa\" align=\"right\">" + c.getFormat() + "</td>" + "</td><td><br></td></tr></table>"); // Where to go and what to do next out.println("<p> <p><strong><a href=\"" + response.encodeURL(request.getContextPath() + "/catalog") + "\">" + messages.getString("ContinueShopping") + "</a> " + "<a href=\"" + response.encodeURL(request.getContextPath() + "/cashier") + "\">" + messages.getString("Checkout") + "</a> " + "<a href=\"" + response.encodeURL(request.getContextPath() + "/showcart?Clear=clear") + "\">" + messages.getString("ClearCart") + "</a></strong>"); } else { // Shopping cart is empty! out.println("<font size=\"+2\">" + messages.getString("CartEmpty") + "</font>" + "<br> <br>" + "<center><a href=\"" + response.encodeURL(request.getContextPath() + "/catalog") + "\">" + messages.getString("Catalog") + "</a> </center>"); } out.println("</body> </html>"); out.close(); } public String getServletInfo() { return "The ShowCart servlet returns information about" + "the books that the user is in the process of ordering."; }}⌨️ 快捷键说明
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