📄 bookdetailsservlet.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 database.*;import cart.*;import util.Currency;import exception.*;/** * This is a simple example of an HTTP Servlet. It responds to the GET * method of the HTTP protocol. */public class BookDetailsServlet 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 doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(true); ResourceBundle messages = (ResourceBundle)session.getAttribute("messages"); // set headers and buffer size 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("TitleBookDescription") + "</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 try { BookDetails bd = bookDB.getBookDetails(bookId); Currency c = (Currency)session.getAttribute("currency"); if (c == null) { c = new Currency(); c.setLocale(request.getLocale()); session.setAttribute("currency", c); } c.setAmount(bd.getPrice()); //Print out the information obtained out.println("<h2>" + bd.getTitle() + "</h2>" + " " + messages.getString("By") + " <em>" + bd.getFirstName() + " " + bd.getSurname() + "</em> " + "(" + bd.getYear() + ")<br> <br>" + "<h4>" + messages.getString("Critics")+ "</h4>" + "<blockquote>" + bd.getDescription() + "</blockquote>" + "<h4>" + messages.getString("Price") + c.getFormat() + "</h4>" + "<p><strong><a href=\"" + response.encodeURL(request.getContextPath() + "/bookcatalog?bookId=" + bookId) + "\">" + messages.getString("CartAdd") + "</a> " + "<a href=\"" + response.encodeURL(request.getContextPath() + "/bookcatalog") + "\">" + messages.getString("ContinueShopping") + "</a></p></strong>"); } catch (BookNotFoundException ex) { response.resetBuffer(); throw new ServletException(ex); } } 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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