📄 bookstoreservlet.java

📁 J2EE导学
💻 JAVA
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/* * * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved. *  * This software is the proprietary information of Sun Microsystems, Inc.   * Use is subject to license terms. *  */import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import database.*;import exception.*;/** * An HTTP Servlet that overrides the service method to return a * simple web page. */public class BookStoreServlet 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.remove();      bookDB = null;   }         public void service (HttpServletRequest request,                         HttpServletResponse response)        throws ServletException, IOException {			                    // 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 {		            BookDetails bd = bookDB.getBookDetails("203");		                       //Left cell -- the "book of choice"           out.println("<b>What We're Reading</b>" +                       "<p>" + "<blockquote>" +                               "In <em><a href=\"" +                       response.encodeURL(request.getContextPath() + "/bookdetails?bookId=203") +                       "\">" + bd.getTitle() + "</a></em>, author " + bd.getFirstName() + " " +  bd.getSurname() + ", "                       + "a world renowned guru on " +                       "web development, talks about how web components can " +                       "transform the way you develop " +                       "applications for the web.  This is a must read for " +                       "any self respecting web developer!</blockquote>");                      //Right cell -- various navigation options           out.println("<p><a href=\"" +                       response.encodeURL(request.getContextPath() + "/catalog") +                       "\"><b>Start Shopping</b></a></font><br>" +                       "<br> &nbsp;" +                       "<br> &nbsp;" +                       "<br> &nbsp;" +                       "</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.";    }}
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