📄 showcartservlet.java
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/*Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.This software is the confidential and proprietary information of SunMicrosystems, Inc. ("Confidential Information"). You shall notdisclose such Confidential Information and shall use it only inaccordance with the terms of the license agreement you entered intowith Sun.SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THESOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THEIMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULARPURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGESSUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTINGTHIS SOFTWARE OR ITS DERIVATIVES.CopyrightVersion 1.0*/import java.io.*;import java.util.*;import java.sql.*;import javax.servlet.*;import javax.servlet.http.*;import database.*;import cart.*;/** * 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("examples.bookstore.database"); if (bookDB == null) { bookDB = BookDB.instance(); getServletContext().setAttribute("examples.bookstore.database", bookDB); } } public void destroy() { 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("examples.bookstore.cart"); // If the user has no cart, create a new one if (cart == null) { cart = new ShoppingCart(); session.setAttribute("examples.bookstore.cart", cart); } // set content type header before accessing the Writer response.setContentType("text/html"); PrintWriter out = response.getWriter(); //Print out the response out.println("<html>" + "<head><title>Your Shopping Cart</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"); if (bookId != null) { cart.remove(bookId); BookDetails book = bookDB.getBookDetails(bookId); out.println("<font color=\"#ff00000\" size=\"+2\">" + "You just removed: <strong>" + book.getTitle() + "</strong> <br> <br>" + "</font>"); } else if (request.getParameter("Clear") != null) { cart.clear(); out.println("<font color=\"#ff0000\" size=\"+2\"><strong>" + "You just cleared your shopping cart!" + "</strong> <br> <br> </font>"); } // Print a summary of the shopping cart int num = cart.getNumberOfItems(); if (num > 0) { out.println("<font size=\"+2\">" + "You have " + num + (num==1 ? " item" : " items") + " in your shopping cart" + "</font><br> "); // Return the Shopping Cart Nice and Pretty out.println("<table>" + "<tr>" + "<th align=left>Quantity</TH>" + "<th align=left>Title</TH>" + "<th align=left>Price</TH>" + "</tr>"); Iterator i = cart.getItems().iterator(); while (i.hasNext()) { ShoppingCartItem item = (ShoppingCartItem) i.next(); BookDetails bookDetails = (BookDetails) item.getItem(); out.println("<tr>" + "<td align=\"right\" bgcolor=\"#ffffff\">" + item.getQuantity() + "</td>" + "<td bgcolor=\"#ffffaa\">" + "<strong><a href=\"" + response.encodeURL("/bookstore/bookdetails?bookId=" + bookDetails.getBookId()) + "\">" + bookDetails.getTitle() + "</a></strong>" + "</td>" + "<td bgcolor=\"#ffffaa\" align=\"right\">" + Currency.format(bookDetails.getPrice(), request.getLocale()) + "</td>" + "<td bgcolor=\"#ffffaa\">" + "<strong>" + "<a href=\"" + response.encodeURL("/bookstore/showcart?Remove=" + bookDetails.getBookId()) + "\">Remove Item</a></strong>" + "</td></tr>"); } // 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\">" + "Total:</td>" + "<td bgcolor=\"#ffffaa\" align=\"right\">" + Currency.format(cart.getTotal(), request.getLocale()) + "</td>" + "</td><td><br></td></tr></table>"); // Where to go and what to do next out.println("<p> <p><strong><a href=\"" + response.encodeURL("/bookstore/catalog") + "\">Continue Shopping</a> " + "<a href=\"" + response.encodeURL("/bookstore/cashier") + "\">Check Out</a> " + "<a href=\"" + response.encodeURL("/bookstore/showcart?Clear=clear") + "\">Clear Cart</a></strong>"); } else { // Shopping cart is empty! out.println("<font size=\"+2\">" + "There is nothing in your shopping cart.</font>" + "<br> <br>" + "<center><a href=\"" + response.encodeURL("/bookstore/catalog") + "\">Back to the 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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