📄 bookdetailservlet.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 java.sql.*;import javax.servlet.*;import javax.servlet.http.*;import database.*;import cart.*;/** * This is a simple example of an HTTP Servlet. It responds to the GET * method of the HTTP protocol. */public class BookDetailServlet extends HttpServlet { private BookDB bookDB; public void init() throws ServletException { bookDB = (BookDB)getServletContext().getAttribute("examples.bookstore.database"); if (bookDB == null) { bookDB = BookDB.instance(); getServletContext().setAttribute("examples.bookstore.database", bookDB); } } public void destroy() { bookDB = null; } public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Get the user's session and shopping cart HttpSession session = request.getSession(true); ShoppingCart cart = (ShoppingCart)session.getAttribute("examples.bookstore.cart"); // If the user has no cart, create a new one if (cart == null) { cart = new ShoppingCart(); session.setAttribute("examples.bookstore.cart", cart); } // 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>Book Description</title></head>"); // Get the dispatcher; it gets the banner to the user RequestDispatcher dispatcher = getServletContext().getRequestDispatcher( "/banner"); if (dispatcher != null) dispatcher.include(request, response); //Get the identifier of the book to display String bookId = request.getParameter("bookId"); if (bookId != null) { // and the information about the book BookDetails bd = bookDB.getBookDetails(bookId); //Print out the information obtained out.println("<h2>" + bd.getTitle() + "</h2>" + " By <em>" + bd.getFirstName() + " " + bd.getSurname() + "</em> " + "(" + bd.getYear() + ")<br> <br>" + "<h4>Here's what the critics say: </h4>" + "<blockquote>" + bd.getDescription() + "</blockquote>" + "<h4>Our price: " + Currency.format(bd.getPrice(), request.getLocale()) + "</h4>" + "<p><strong><a href=\"" + response.encodeURL("/bookstore/catalog?Add=" + bookId) + "\"> Add To Your Shopping Cart</a> " + "<a href=\"" + response.encodeURL("/bookstore/catalog") + "\">Continue Shopping</a></p></strong>"); } out.println("</body></html>"); out.close(); } public String getServletInfo() { return "The BookDetail servlet returns information about" + "any book that is available from the bookstore."; }}⌨️ 快捷键说明
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