Como Programar en Java - 5ta Edición - Harvey M. Deitel & Paul J. Deitel
2002 Prentice Hall. All rights reserved. Chapter 17: Enterprise Java Case Study: Architectural...
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Transcript of 2002 Prentice Hall. All rights reserved. Chapter 17: Enterprise Java Case Study: Architectural...
2002 Prentice Hall. All rights reserved.
Chapter 17: Enterprise Java Case Study: Architectural Overview
Outline17.1 Introduction17.2 Deitel Bookstore17.3 System Architecture17.4 Enterprise JavaBeans
17.4.1 Entity EJBs17.4.2 Stateful Session EJBs
17.5 Servlet Controller Logic17.6 XSLT Presentation Logic
2002 Prentice Hall. All rights reserved.
17.1 Introduction
• Online bookstore e-business application– Servlets
– EJBs
– XML
– XSLT
– MVC architecture
2002 Prentice Hall. All rights reserved.
17.2 Deitel Bookstore
• Case study– Implement functionality for commercial on-line store
• Provide product catalog
• Provide shopping cart
• Provide customer registration
• Allow customers to view previous orders
• Provide functionality for several clients
– Standard Web browsers
– WML browsers
– cHTML browsers
2002 Prentice Hall. All rights reserved.
17.3 System Architecture
• Multi-tier application– Information tier
• Maintains data for application (RDBMS)
– Middle tier• Implements business logic and controller logic
– Control interactions between information and client tiers
– Client tier• Application’s user interface (e.g., Web browser)
2002 Prentice Hall. All rights reserved.
17.3 System Architecture (cont.)
Applic ation Server
Middle Tier Info rmation TierClient Tier
RDBMS
Fig. 17.1 Three-tier application model in Deitel Bookstore.
2002 Prentice Hall. All rights reserved.
17.3 System Architecture (cont.)
Middle Tier
Servlet Conta iner
Web Server
Servlets implement the applic ation’s contro ller and communicate with EJ Bs using RMI-IIOP.
XML
Clients communicate with the Web server, which forwards requests to the servlets running in the applic ation server’s servlet container.
XSLTransformer(cHTML)
XSL
WAPClient
WebBrowser
Client Tier
i-modeC lient
RDBMS
Information Tier
The information tier and EJ Bs fo rm the applic ation’s model.
EJ B EJ BEJ B
EJ B C ontainer
Servlet
RMI-IIOP
App
lica
tion S
erv
er
XML
XSLTransformer(XHTML)
XSL
Servlet
XML
XSLTransformer(WML)
XSL
Servlet
J DBC
XSL transformations implement the application’s view, customizing content for eac h client type.
The EJ B container provides run-time services to the EJ Bs, such as database connections, and life -c ycle management.
The servlet container manages servlet life -cycles and communic ation with the Web server.
Fig. 17.2 Detailed architecture of Deitel Bookstore Enterprise Java case study.
2002 Prentice Hall. All rights reserved.
17.4 Enterprise JavaBeans
• EJBs– Implement business logic and database abstraction layer
– Stateful session EJB• Represents a customer’s shopping cart
– Entity EJB• Provide object-based interface to information tier
• Servlets– Use EJB business logic to create an on-line store
2002 Prentice Hall. All rights reserved.
17.4.1 Entity EJBs
• Entity EJB– Provide object-based interface to information tier
– Represents object stored in application’s relational database• Class Customer stores
– First name
– Last name
– Billing address
– Shipping address
– Credit-card information
• Class Product
2002 Prentice Hall. All rights reserved.
17.4.1 Entity EJBs (cont.)
• Entity EJB– Each entity EJB has corresponding model class
• Has properties for each entity EJB property
• e.g., Product EJB has corresponding ProductModel– ProductModel has properties for
• Product ISBN
• Product price
• Product author
2002 Prentice Hall. All rights reserved.
17.4.2 Stateful Session EJBs
• ShoppingCart– Stateful session EJB
– Manages customer’s shopping cart
– Primary business-logic component in Deitel Bookstore
2002 Prentice Hall. All rights reserved.
17.5 Servlet Controller Logic
• Servlets– Middle-tier interface between client and business logic
– Implement the controller in MVC architecture
– Interact with EJB business-logic components• Handle client requests (via HTTP and WAP)
• Process data as XML documents
• Pass XML documents through XSL transformations
– Produce presentation for each client
2002 Prentice Hall. All rights reserved.
17.6 XSLT Presentation Logic
• Generate appropriate presentation for each client– Each servlet employs XSL Transformer and XSLTs
• One XLST for producing XHTML
• One XLST for producing WML
• One XLST for producing cHTML
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.3 XML file generated by Get-ProductServlet.
Lines 1-14
1 <?xml version="1.0" encoding="UTF-8"?>2 <catalog>3 <product>4 <isbn>0130284173</isbn>5 <publisher>Prentice Hall</publisher>6 <author>Deitel, Deitel, Nieto, Lin & Sadhu</author>7 <title>XML How to Program</title>8 <price>$69.95</price>9 <pages>1200</pages>10 <image>images/xmlhtp1.jpg</image>11 <media>CD</media>12 <quantity>500</quantity>13 </product>14 </catalog>
XML document marks up a product, including the product’s ISBN, title,
author, publisher and price
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.4 XSL transformation for generating XHTML from GetProduct-Servlet (part 1).
Lines 1-92
1 <?xml version = "1.0"?>2 3 <!-- ProductDetails.xsl -->4 <!-- XSLT stylesheet for transforming content generated by -->5 <!-- GetProductServlet into XHTML. -->6 7 <xsl:stylesheet version = "1.0"8 xmlns:xsl = "http://www.w3.org/1999/XSL/Transform">9 10 <xsl:output method = "xml" omit-xml-declaration = "no" 11 indent = "yes" doctype-system = "DTD/xhtml1-strict.dtd"12 doctype-public = "-//W3C//DTD XHTML 1.0 Strict//EN"/>13 14 <!-- include template for processing error elements -->15 <xsl:include href = "/XSLT/XHTML/error.xsl"/>16 17 <!-- template for product element -->18 <xsl:template match = "product">19 <html xmlns = "http://www.w3.org/1999/xhtml" 20 xml:lang = "en" lang = "en">21 22 <head>23 <title>24 <xsl:value-of select = "title"/> -- Description25 </title>26 27 <link rel = "StyleSheet" href = "styles/default.css"/>28 </head>29 30 <body>31 32 <!-- copy navigation header into XHTML document -->33 <xsl:for-each select = 34 "document( '/XSLT/XHTML/navigation.xml' )">35 <xsl:copy-of select = "."/>
Extract relevant pieces of information from the XML
document to create appropriate XHTML representation
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.4 XSL transformation for generating XHTML from GetProduct-Servlet (part 2).
36 </xsl:for-each>37 38 <div class = "header">39 <xsl:value-of select = "title"/>40 </div>41 42 <div class = "author">43 by <xsl:value-of select = "author"/>44 </div>45 46 <!-- create div element with details of Product -->47 <div class = "productDetails">48 <table style = "width: 100%;">49 <tr>50 <td style = "text-align: center;">51 <img class = "bookCover" 52 src = "images/{image}"53 alt = "{title} cover image."/> 54 </td>55 56 <td>57 <p style = "text-align: right;">58 Price: <xsl:value-of select = "price"/>59 </p>60 61 <p style = "text-align: right;">62 ISBN: <xsl:value-of select = "ISBN"/>63 </p>64 65 <p style = "text-align: right;">66 Pages: <xsl:value-of select = "pages"/>67 </p> 68
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.4 XSL transformation for generating XHTML from GetProduct-Servlet (part 3).
69 <p style = "text-align: right;">70 Publisher: 71 <xsl:value-of select = "publisher"/>72 </p>73 74 <!-- AddToCart button -->75 <form method = "post" action = "AddToCart">76 <p style = "text-align: center;">77 <input type = "submit" 78 value = "Add to cart"/>79 80 <input type = "hidden" name = "ISBN" 81 value = "{ISBN}"/>82 </p>83 </form>84 </td>85 </tr>86 </table>87 </div>88 89 </body>90 </html>91 </xsl:template>92 </xsl:stylesheet>
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 1).
1 <?xml version="1.0" encoding="UTF-8"?>2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 3 "DTD/xhtml1-strict.dtd">4 <html xmlns="http://www.w3.org/1999/xhtml" 5 lang="en" xml:lang="en">6 <head>7 <title>XML How to Program -- Description</title>8 <link href="styles/default.css" rel="StyleSheet" />9 </head>10 <body>11 <div>12 <div class="logo">13 <table style="width: 100%;">14 <tr>15 <td style="text-align: left;">16 <img src="images/logotiny.gif" 17 alt="Deitel & Associates, Inc. logo." />18 </td>19 20 <td style="text-align: right;">21 <div style=22 "position: relative; bottom: -50px;">23 <form action="ProductSearch" method="get">24 <p><input type="text" size="15"25 name="searchString" />26 <input type="submit" value="Search" />27 </p>28 </form>29 </div>30 </td>31 </tr>32 </table>33 </div>34
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 2).
35 <div class="navigation">36 <table class="menu">37 <tr>38 <td class="menu">39 <a href="GetAllProducts">Product Catalog</a>40 </td>41 42 <td class="menu">43 <a href="registration.html">Create Account</a>44 </td>45 46 <td class="menu">47 <a href="login.html">Log in</a>48 </td>49 50 <td class="menu">51 <a href="ViewCart">Shopping Cart</a>52 </td>53 54 <td class="menu">55 <a href="ViewOrderHistory">Order History</a>56 </td>57 </tr>58 </table>59 </div>60 61 </div>62 <div class="header">XML How to Program</div>63 <div class="author">64 by Deitel, Deitel, Nieto, Lin & Sadhu</div>65 <div class="productDetails">66 <table style="width: 100%;">67 <tr>68 <td style="text-align: center;">
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 3).
69 <img alt="XML How to Program cover image." 70 src="images/xmlhtp1.jpg" 71 class="bookCover" /></td>72 <td>73 <p style="text-align: right;">74 Price: $69.95</p>75 <p style="text-align: right;">76 ISBN: 0130284173</p>77 <p style="text-align: right;">78 Pages: 1100</p>79 <p style="text-align: right;">80 Publisher: Prentice Hall</p>81 82 <form action="AddToCart" method="post">83 <p style="text-align: center;">84 <input value="Add to cart" 85 type="submit" />86 <input value="0130284173" 87 name="ISBN" type="hidden" /></p>88 </form>89 </td>90 </tr>91 </table>92 </div>93 </body>94 </html>
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 4).
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.6 XSL transformation for generating WML from GetProduct-Servlet (part 1).
Lines 1-54
1 <?xml version = "1.0"?>2 3 <xsl:stylesheet version = "1.0"4 xmlns:xsl = "http://www.w3.org/1999/XSL/Transform">5 6 <xsl:output method = "xml" omit-xml-declaration = "no" 7 doctype-system = "http://www.wapforum.org/DTD/wml_1.1.xml"8 doctype-public = "-//WAPFORUM//DTD WML 1.1//EN"/>9 10 <xsl:include href = "/XSLT/WML/error.xsl"/> 11 12 <xsl:template match = "product">13 <wml>14 15 <card id = "product" title = "{title}">16 <do type = "accept" label = "Add To Cart">17 <go href = "AddToCart" method = "post">18 <postfield name = "ISBN" value = "{ISBN}"/>19 </go>20 </do>21 22 <do type = "prev" label = "Back">23 <prev/>24 </do>25 26 <p>Description:</p>27 <p><xsl:value-of select = "title"/></p>28 <p>by <xsl:value-of select = "author"/></p>29 30 <p>31 <table columns = "2" title = "info">32 <tr>33 <td>ISBN: 34 <xsl:value-of select = "ISBN"/>35 </td>
Extract relevant pieces of information from the XML
document to create appropriate WML representation
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.6 XSL transformation for generating WML from GetProduct-Servlet (part 2).
36 <td>Price: 37 $<xsl:value-of select = "price"/>38 </td>39 </tr>40 <tr>41 <td>Publisher: 42 <xsl:value-of select = "publisher"/>43 </td>44 <td>Pages: 45 <xsl:value-of select = "pages"/>46 </td>47 </tr>48 </table>49 </p>50 </card>51 52 </wml>53 </xsl:template>54 </xsl:stylesheet>
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.7 WML document generated by XSLT in Get-ProductServlet (part 1).
Lines 1-29
1 <?xml version="1.0"?>2 <!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" 3 "http://www.wapforum.org/DTD/wml_1.1.xml">4 5 <wml>6 <card title="XML How to Program" id="product">7 <do label="Add To Cart" type="accept">8 <go method="post" href="AddToCart">9 <postfield value="0130284173" name="ISBN"/></go>10 </do>11 <do label="Back" type="prev"><prev/></do>12 13 <p>Description:</p>14 <p>XML How to Program</p>15 <p>by Deitel, Deitel, Nieto, Lin & Sadhu</p>16 <p>17 <table title="info" columns="2">18 <tr>19 <td>ISBN: 0130284173</td>20 <td>Price: $$69.95</td>21 </tr>22 <tr>23 <td>Publisher: Prentice Hall</td>24 <td>Pages: 1100</td>25 </tr>26 </table>27 </p>28 </card>29 </wml>
WML document contains little formatting information, because display capabilities are limited
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.7 WML document generated by XSLT in Get-ProductServlet (part 2).
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.8 XSL transformation for generating cHTML from GetProduct-Servlet (part 1).
Lines 1-78
1 <?xml version = "1.0"?>2 3 <xsl:stylesheet version = "1.0"4 xmlns:xsl = "http://www.w3.org/1999/XSL/Transform">5 6 <xsl:output method = "html" 7 omit-xml-declaration = "yes" 8 indent = "yes" 9 doctype-system = 10 "http://www.w3.org/MarkUp/html-spec/html-spec_toc.html"11 doctype-public = "-//W3C//DTD HTML 2.0//EN"/>12 13 <xsl:include href = "/XSLT/cHTML/error.xsl"/>14 15 <xsl:template match = "product">16 <html>17 18 <head>19 <title>20 <xsl:value-of select = "title"/> -- Description21 </title>22 </head>23 24 <body>25 <div class = "header">26 <xsl:value-of select = "title"/>27 </div>28 29 <div class = "author">30 by <xsl:value-of select = "author"/>31 </div>32
Extract relevant pieces of information from the XML
document to create appropriate cHTML representation
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.8 XSL transformation for generating cHTML from GetProduct-Servlet (part 2).
33 <!-- create div element with details of Product -->34 <div class = "productDetails">35 <table>36 <tr>37 <td style = "text-align: center;">38 <img class = "bookCover" 39 src = "images/{image}"/> 40 </td>41 42 <td>43 <p style = "text-align: right;">44 Price: <xsl:value-of select = "price"/>45 </p>46 47 <p style = "text-align: right;">48 ISBN: <xsl:value-of select = "ISBN"/>49 </p>50 51 <p style = "text-align: right;">52 Pages: <xsl:value-of select = "pages"/>53 </p> 54 55 <p style = "text-align: right;">56 Publisher: 57 <xsl:value-of select = "publisher"/>58 </p>59 60 <!-- AddToCart button -->61 <form method="post" action="AddToCart">62 <p style = "text-align: center;">63 <input type = "submit" 64 value = "Add to cart"/>65 </p>66
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.8 XSL transformation for generating cHTML from GetProduct-Servlet (part 3).
67 <input type = "hidden" name = "ISBN" 68 value = "{ISBN}"/>69 </form>70 </td>71 </tr>72 </table>73 </div>74 </body>75 76 </html>77 </xsl:template>78 </xsl:stylesheet>
2002 Prentice Hall.All rights reserved.
Outline
Fig. 17.9 cHTML document generated by XSLT in Get-ProductServlet (part 1).
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 2.0//EN" 2 "http://www.w3.org/MarkUp/html-spec/html-spec_toc.html">3 <html>4 <head>5 <META http-equiv="Content-Type" 6 content="text/html; charset=UTF-8">7 <title>XML How to Program -- Description</title>8 </head>9 <body>10 <div class="header">XML How to Program</div>11 <div class="author">12 by Deitel, Deitel, Nieto, Lin & Sadhu</div>13 <div class="productDetails">14 <table>15 <tr>16 <td style="text-align: center;">17 <img src="images/xmlhtp1.jpg" class="bookCover">18 </td>19 <td>20 <p style="text-align: right;">Price: $69.95</p>21 22 <p style="text-align: right;">ISBN: 0130284173</p>23 24 <p style="text-align: right;">Pages: 1100</p>25 26 <p style="text-align: right;">27 Publisher: Prentice Hall</p>28 29 <form action="AddToCart" method="post">30 <p style="text-align: center;">31 <input value="Add to cart" type="submit">32 </p>33 <input value="0130284173" name="ISBN" 34 type="hidden">35 </form>