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Chapter 17: Enterprise Java Case Study: Architectural Overview

Chapter 17: Enterprise Java Case Study: Architectural Overview. Outline 17.1 Introduction 17.2 Deitel Bookstore 17.3 System Architecture 17.4 Enterprise JavaBeans 17.4.1 Entity EJBs 17.4.2 Stateful Session EJBs 17.5 Servlet Controller Logic 17.6 XSLT Presentation Logic.

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Chapter 17: Enterprise Java Case Study: Architectural Overview

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  1. Chapter 17: Enterprise Java Case Study: Architectural Overview Outline17.1 Introduction17.2 Deitel Bookstore17.3 System Architecture17.4 Enterprise JavaBeans 17.4.1 Entity EJBs 17.4.2 Stateful Session EJBs17.5 Servlet Controller Logic17.6 XSLT Presentation Logic

  2. 17.1 Introduction • Online bookstore e-business application • Servlets • EJBs • XML • XSLT • MVC architecture

  3. 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

  4. 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)

  5. 17.3 System Architecture (cont.) Fig. 17.1 Three-tier application model in Deitel Bookstore.

  6. 17.3 System Architecture (cont.) Fig. 17.2 Detailed architecture of Deitel Bookstore Enterprise Java case study.

  7. 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

  8. 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

  9. 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

  10. 17.4.2 Stateful Session EJBs • ShoppingCart • Stateful session EJB • Manages customer’s shopping cart • Primary business-logic component in Deitel Bookstore

  11. 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

  12. 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

  13. XML document marks up a product, including the product’s ISBN, title, author, publisher and price 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 &amp; 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> Fig. 17.3 XML file generated by Get-ProductServlet.Lines 1-14

  14. 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"/> -- Description 25 </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 = "."/> Fig. 17.4 XSL transformation for generating XHTML from GetProduct-Servlet (part 1).Lines 1-92 Extract relevant pieces of information from the XML document to create appropriate XHTML representation

  15. 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 Fig. 17.4 XSL transformation for generating XHTML from GetProduct-Servlet (part 2).

  16. 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> Fig. 17.4 XSL transformation for generating XHTML from GetProduct-Servlet (part 3).

  17. 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 &amp; 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 Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 1).

  18. 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 &amp; Sadhu</div> 65 <div class="productDetails"> 66 <table style="width: 100%;"> 67 <tr> 68 <td style="text-align: center;"> Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 2).

  19. 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> Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 3).

  20. Fig. 17.5 XHTML document generated by XSLT in Get-ProductServlet (part 4).

  21. 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> Fig. 17.6 XSL transformation for generating WML from GetProduct-Servlet (part 1).Lines 1-54 Extract relevant pieces of information from the XML document to create appropriate WML representation

  22. 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> Fig. 17.6 XSL transformation for generating WML from GetProduct-Servlet (part 2).

  23. 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 &amp; 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> Fig. 17.7 WML document generated by XSLT in Get-ProductServlet (part 1).Lines 1-29 WML document contains little formatting information, because display capabilities are limited

  24. Fig. 17.7 WML document generated by XSLT in Get-ProductServlet (part 2).

  25. 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"/> -- Description 21 </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 Fig. 17.8 XSL transformation for generating cHTML from GetProduct-Servlet (part 1).Lines 1-78 Extract relevant pieces of information from the XML document to create appropriate cHTML representation

  26. 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 Fig. 17.8 XSL transformation for generating cHTML from GetProduct-Servlet (part 2).

  27. 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> Fig. 17.8 XSL transformation for generating cHTML from GetProduct-Servlet (part 3).

  28. 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 &amp; 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> Fig. 17.9 cHTML document generated by XSLT in Get-ProductServlet (part 1).

  29. 36 </td> 37 </tr> 38 </table> 39 </div> 40 </body> 41 </html> Fig. 17.9 cHTML document generated by XSLT in Get-ProductServlet (part 2).

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