📄 receiptservlet.java
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/* * Copyright (c) 2002 Sun Microsystems, Inc. All rights reserved. U.S. * Government Rights - Commercial software. Government users are subject * to the Sun Microsystems, Inc. standard license agreement and * applicable provisions of the FAR and its supplements. Use is subject * to license terms. * * This distribution may include materials developed by third parties. * Sun, Sun Microsystems, the Sun logo, Java and J2EE are trademarks * or registered trademarks of Sun Microsystems, Inc. in the U.S. and * other countries. * * Copyright (c) 2002 Sun Microsystems, Inc. Tous droits reserves. * * Droits du gouvernement americain, utilisateurs gouvernementaux - logiciel * commercial. Les utilisateurs gouvernementaux sont soumis au contrat de * licence standard de Sun Microsystems, Inc., ainsi qu'aux dispositions * en vigueur de la FAR (Federal Acquisition Regulations) et des * supplements a celles-ci. Distribue par des licences qui en * restreignent l'utilisation. * * Cette distribution peut comprendre des composants developpes par des * tierces parties. Sun, Sun Microsystems, le logo Sun, Java et J2EE * sont des marques de fabrique ou des marques deposees de Sun * Microsystems, Inc. aux Etats-Unis et dans d'autres pays. */package servlets;import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import cart.ShoppingCart;import database.*;import exception.*;/** * An HTTP servlet that responds to the POST method of the HTTP protocol. * The Receipt servlet updates the book database inventory, invalidates the user session, * thanks the user for the order. */public class ReceiptServlet 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 = null; } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { boolean orderCompleted = true; // 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 (cart == null) { cart = new ShoppingCart(); session.setAttribute("cart", cart); } // Update the inventory try { bookDB.buyBooks(cart); } catch (OrderException e) { System.err.println(e.getMessage()); orderCompleted = false; } // Payment received -- invalidate the session session.invalidate(); // set content type header before accessing the Writer response.setContentType("text/html"); response.setBufferSize(8192); PrintWriter out = response.getWriter(); // then write the response out.println("<html>" + "<head><title>" + messages.getString("TitleReceipt") + "</title></head>" ); // Get the dispatcher; it gets the banner to the user RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/banner"); if (dispatcher != null) dispatcher.include(request, response); if (orderCompleted) out.println("<h3>" + messages.getString("ThankYou") + request.getParameter("cardname") + "."); else out.println("<h3>" + messages.getString("OrderError")); out.println("<p> <p><strong><a href=\"" + response.encodeURL(request.getContextPath()) + "/bookstore\">" + messages.getString("ContinueShopping") + "</a> " + "</body></html>"); out.close(); } public String getServletInfo() { return "The Receipt servlet updates the book database inventory, invalidates the user session, " + "thanks the user for the order."; }}⌨️ 快捷键说明
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