📄 bookstoreservlet.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 com.sun.bookstore.database.Book;import com.sun.bookstore.exception.BookNotFoundException;import com.sun.bookstore1.database.BookDBAO;import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import com.sun.bookstore.exception.*;/** * An HTTP Servlet that overrides the service method to return a * simple web page. */public class BookStoreServlet 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(); ResourceBundle messages = (ResourceBundle) session.getAttribute( "messages"); if (messages == null) { Locale locale = request.getLocale(); messages = ResourceBundle.getBundle( "com.sun.bookstore.messages.BookstoreMessages", locale); session.setAttribute("messages", messages); } // set content-type header before accessing the Writer response.setContentType("text/html"); response.setBufferSize(8192); PrintWriter out = response.getWriter(); // then write the data of the response out.println("<html>" + "<head><title>Duke's Bookstore</title></head>"); // Get the dispatcher; it gets the banner to the user RequestDispatcher dispatcher = getServletContext() .getRequestDispatcher("/banner"); if (dispatcher != null) { dispatcher.include(request, response); } try { Book bd = bookDB.getBook("203"); //Left cell -- the "book of choice" out.println( "<b>" + messages.getString("What") + "</b>" + "<p>" + "<blockquote>" + "<em><a href=\"" + response.encodeURL( request.getContextPath() + "/bookdetails?bookId=203") + "\">" + bd.getTitle() + "</a></em>" + messages.getString("Talk") + "</blockquote>"); //Right cell -- various navigation options out.println( "<p><a href=\"" + response.encodeURL( request.getContextPath() + "/bookcatalog") + "\"><b>" + messages.getString("Start") + "</b></a></font><br>" + "<br> " + "<br> " + "<br> " + "</body>" + "</html>"); } catch (BookNotFoundException ex) { response.resetBuffer(); throw new ServletException(ex); } out.close(); } public String getServletInfo() { return "The BookStore servlet returns the main web page " + "for Duke's Bookstore."; }}⌨️ 快捷键说明
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