📄 receiptservlet.java
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/* * Copyright 2007 Sun Microsystems, Inc. * All rights reserved. You may not modify, use, * reproduce, or distribute this software except in * compliance with the terms of the License at: * http://developer.sun.com/berkeley_license.html */package com.sun.bookstore1.servlets;import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import com.sun.bookstore.cart.*;import com.sun.bookstore.cart.ShoppingCart;import com.sun.bookstore1.database.BookDBAO;import com.sun.bookstore.exception.*;import javax.annotation.Resource;import javax.transaction.UserTransaction;/** * 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 BookDBAO bookDB; @Resource private UserTransaction utx; public void init() throws ServletException { bookDB = (BookDBAO) 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 { utx.begin(); bookDB.buyBooks(cart); utx.commit(); } catch (Exception ex) { try { utx.rollback(); } catch (Exception e) { System.out.println("Rollback failed: " + e.getMessage()); } System.err.println(ex.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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