📄 receiptservlet.java

📁 一个java写的加密算法
💻 JAVA
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/* * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved. * Use is subject to license terms. */package samples.webapps.bookstore; import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import samples.webapps.bookstore.cart.ShoppingCart;import samples.webapps.bookstore.database.*;import samples.webapps.bookstore.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> &nbsp; <p><strong><a href=\"" +        response.encodeURL(request.getContextPath()) +        "/enter\">" + 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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