📄 receiptservlet.java

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/* * Copyright (c) 2006 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) 2006 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 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> &nbsp; <p><strong><a href=\""                + response.encodeURL(request.getContextPath())                + "/bookstore\">" + messages.getString("ContinueShopping")                + "</a> &nbsp; &nbsp; &nbsp;" + "</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.";    }}
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