📄 receiptservlet.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 javax.servlet.*;import javax.servlet.http.*;import cart.ShoppingCart;/** * An HTTP servlet that responds to the POST method of the HTTP protocol. * It clears the shopping cart, thanks the user for the order, * and resets the page to the BookStore's main page. */public class ReceiptServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Get the user's session and shopping cart HttpSession session = request.getSession(true); ShoppingCart cart = (ShoppingCart)session.getValue(session.getId()); // If the user has no cart, create a new one if (cart == null) { cart = new ShoppingCart(); session.putValue(session.getId(), cart); } // Payment received -- invalidate the session session.invalidate(); // set content type header before accessing the Writer response.setContentType("text/html"); PrintWriter out = response.getWriter(); // then write the response out.println("<html>" + "<head><title> Receipt </title>" + "<meta http-equiv=\"refresh\" content=\"4; url=" + "http://" + request.getHeader("Host") + "/servlet/bookstore;\">" + "</head>" + "<body bgcolor=\"#FFFFFF\">" + "<center>" + "<hr> <br> " + "<h1>" + "<font size=\"+3\" color=\"red\">Duke's </font>" + "<font size=\"+3\" color=\"purple\">Bookstore</font>" + "</h1>" + "</center>" + "<br> <hr> <br> "); out.println("<h3>Thank you for purchasing your books from us " + request.getParameter("cardname") + "<p>Please shop with us again soon!</h3>" + "<p><i>This page automatically resets.</i>" + "</body></html>"); out.close(); } public String getServletInfo() { return "The Receipt servlet clears the shopping cart, " + "thanks the user for the order, and resets the " + "page to the BookStore's main page."; }}⌨️ 快捷键说明
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