📄 bookdetailsservlet.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.database.Book;import com.sun.bookstore.exception.BookNotFoundException;import com.sun.bookstore1.database.BookDBAO;import com.sun.bookstore1.util.Currency;import com.sun.bookstore.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 BookDBAO bookDB; 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 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 { Book bd = bookDB.getBook(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.getCalendar_year() + ")<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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