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<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <title>The Example JSP Pages</title> <link rel="StyleSheet" href="document.css" type="text/css" media="all" /> <link rel="StyleSheet" href="catalog.css" type="text/css" media="all" /> <link rel="Table of Contents" href="J2EETutorialTOC.html" /> <link rel="Previous" href="JSPIntro2.html" /> <link rel="Next" href="JSPIntro4.html" /> <link rel="Index" href="J2EETutorialIX.html" /> </head> <body> <table width="550" summary="layout" id="SummaryNotReq1"> <tr> <td align="left" valign="center"> <font size="-1"> <a href="http://java.sun.com/j2ee/1.4/download.html#tutorial" target="_blank">Download</a> <br> <a 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href="http://java.sun.com/j2ee/1.4/docs/tutorial/information/sendusmail.html" target="_blank">Feedback</a></font> </font> </td> </tr> </table> <img src="images/blueline.gif" width="550" height="8" ALIGN="BOTTOM" NATURALSIZEFLAG="3" ALT="Divider"> <blockquote><a name="wp83415"> </a><h2 class="pHeading1">The Example JSP Pages</h2><a name="wp65811"> </a><p class="pBody">To illustrate JSP technology, this chapter rewrites each servlet in the Duke's Bookstore application introduced in <a href="Servlets3.html#wp63984">The Example Servlets</a> as a JSP page:</p><div align="left"><table border="1" summary="Duke's Bookstore JSP Pages" id="wp65822"> <caption><a name="wp65822"> </a><div class="pTableTitle">Table 12-1 Duke's Bookstore Example JSP Pages </div></caption> <tr align="center"> <th><a name="wp65826"> </a><div class="pCellHeading">Function</div></th> <th><a name="wp65828"> </a><div class="pCellHeading">JSP Pages</div></th></tr> <tr align="left"> <td><a name="wp65830"> </a><div class="pCellBody">Enter the bookstore</div></td> <td><a name="wp65832"> </a><div class="pCellBody"><code class="cCode">bookstore.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65834"> </a><div class="pCellBody">Create the bookstore banner</div></td> <td><a name="wp65836"> </a><div class="pCellBody"><code class="cCode">banner.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65838"> </a><div class="pCellBody">Browse the books offered for sale</div></td> <td><a name="wp65840"> </a><div class="pCellBody"><code class="cCode">bookcatalog.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65842"> </a><div class="pCellBody">Add a book to the shopping cart</div></td> <td><a name="wp65844"> </a><div class="pCellBody"><code class="cCode">bookcatalog.jsp</code> and <code class="cCode">bookdetails.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65846"> </a><div class="pCellBody">Get detailed information on a specific book</div></td> <td><a name="wp65848"> </a><div class="pCellBody"><code class="cCode">bookdetails.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65850"> </a><div class="pCellBody">Display the shopping cart</div></td> <td><a name="wp65852"> </a><div class="pCellBody"><code class="cCode">bookshowcart.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65854"> </a><div class="pCellBody">Remove one or more books from the shopping cart</div></td> <td><a name="wp65856"> </a><div class="pCellBody"><code class="cCode">bookshowcart.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65858"> </a><div class="pCellBody">Buy the books in the shopping cart</div></td> <td><a name="wp65860"> </a><div class="pCellBody"><code class="cCode">bookcashier.jsp</code></div></td></tr> <tr align="left"> <td><a name="wp65862"> </a><div class="pCellBody">Receive an acknowledgement for the purchase</div></td> <td><a name="wp65864"> </a><div class="pCellBody"><code class="cCode">bookreceipt.jsp</code></div></td></tr></table></div><p class="pBody"></p><a name="wp65865"> </a><p class="pBody">The data for the bookstore application is still maintained in a database. However, two changes are made to the database helper object <code class="cCode"><a href="../examples/web/bookstore2/src/database/BookDB.java" target="_blank">database.BookDB</a></code>:</p><div class="pSmartList1"><ul class="pSmartList1"><a name="wp66452"> </a><div class="pSmartList1"><li>The database helper object is rewritten to conform to JavaBeans component design patterns as described in <a href="JSPIntro8.html#wp70948">JavaBeans Component Design Conventions</a>. This change is made so that JSP pages can access the helper object using JSP language elements specific to JavaBeans components. </li></div><a name="wp65871"> </a><div class="pSmartList1"><li>Instead of accessing the bookstore database directly, the helper object goes through a data access object <code class="cCode">database.BookDBAO</code>.</li></div></ul></div><a name="wp65872"> </a><p class="pBody">The implementation of the database helper object follows. The bean has two instance variables: the current book and the data access object. </p><div class="pPreformattedRelative"><pre class="pPreformattedRelative">package database;public class BookDB { private String bookId = "0"; private BookDBAO database = null; public BookDB () throws Exception { } public void setBookId(String bookId) { this.bookId = bookId; }⌨️ 快捷键说明
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