Enterprise JavaBeans | IBM Version 5 specs

documentation page. This is made use of at this point to test if the retrieval of data works properly.

6.A graphical user interface is developed using XSL stylesheets. To start with, the target HTML file needs to be located. This file would represent the output page to be displayed. The Application Developer wizards are used to create a mapping between the output from the database to the output required for display through a few steps:

a.Generating of the DTD

b.Generation of the XML file for the output data

c.The mapping between the input data and the output display data. The stylesheet, however, has to be customized.

7.A servlet is developed to transform the data from a hierarchical structure to HTML using XSLT processors. The servlet is in turn called from a HTML page.

During the execution of the system, only the components in the run-time components are executed. The following sequence of events follows:

1.The user activates the servlet through the HTML form.

2.The servlet calls the generated Web service classes. It calls the proxy classes, supplying it the primary key and stores them in a DOM structure.

3.The servlet then passes the DOM structure to the XSL Transformer. The XSLT stylesheet of the display output is also an input to the transfer. The transformer produces an HTML file.

4.The newly created HTML file is sent to the Web browser.

Application Developer XML Web Services provide a powerful new tool for integrating heterogeneous applications over the Internet. Application Developer provides a fully supported production-ready deployment environment for Web services based on the Apache SOAP run-time environment. XML plays a central part by providing a data interchange format that is independent of programming languages, operating systems, and hardware.

8.4 Enterprise JavaBeans

The Enterprise JavaBeans (EJB) specification provides a framework for creating reusable business logic components without regard to system infrastructure or location.

Many business problems today require large, complex systems to solve them. The trend is to use a multi-tier architecture in which the client communicates with

172 The XML Files: Development of XML/XSL Applications Using WebSphere Studio

Image 188

IBM Version 5 manual Enterprise JavaBeans

Contents

XML Files Page International Technical Support Organization First Edition December Contents XML Collection Contents Part 4. Appendixes Abbreviations and acronyms Page Copyright License Trademarks Cics Preface Team that wrote this redbookPage Become a published author Comments welcomePage Part Page XML overview XML concepts Background XML business benefits Information sharing XML within an organization Technical benefits of XML XML in new innovationsVoice XML Scalable Vector Graphics Acceptability of use for data transfer Uniformity and conformitySimplicity and openness Separation of data and display Industry acceptance XML historyExtensibility XML1.0 Xslt and Web applications Web Tier Web services and XML Interaction of Web services XML, W3C, and IBM Recommendations Working drafts in developmentPage Technologies in XML XML Processor parser Tree-based parsing DTD and XML Schema Event-based parsingPage Schema and style using CSS, XSLT, and XSL Cascading Style Sheet CSS XML namespaces Example 2-1 a namespace example Example 2-2 a namespace example using namespace prefix Link and jump using XLink, XPointer, and XML Base Example 2-3 a simple link Example 2-4 An extended link Example 2-5 An example of extended links using xbase XML Base XML Pointer XPointer paths and steps XPointer range functions XPointer string functions XPath Example 2-6 An XPath example XML digital Book Library Technologies in XML Example 2-8 Encrypted Information on passenger John Smith Examples of XML encryptionExample 2-7 Information on passenger John Smith Example 2-10 Encryption of the whole document Example of a XML digital signatureExample 2-9 Encrypting only the credit card number Example 2-12 Part encryption of an XML document TransformsExample 2-11 An XML digital signature Example 2-13 The final XML document after encryption Other security specifications XML query language Path expressions Element constructors FLWRFOR, LET, Where and Return clauses expression Conditional expressions if then Else Quantifiers Filtering Example schema for relational database and Xquery comparison Querying relational data Grouping in XQuery Joins Xslt compilers Xsltc Xslt interpreters For more details, visit Using XSLTCThe Apache XML Project at Java Architecture for XML Binding Jaxb Cocoon Serializer pipeline outputs Generators and reader pipeline inputsTransformers and actions processing steps Example 2-14 Sample sitemap for Cocoon Matchers and selectors conditional processingSitemap Example 2-15 Components of a sitemap XML file Part 2 XML technology in IBM WebSphere Page Processing XML XML applications Xalan Xalan model of operation SAX2 Javax.xml.transforms interfaces operation Example 3-1 Sample XML document Example 3-2 Sample event breakdown SAX2 classes and interfaces Example 3-4 Sample namespace XML namespace supportExample 3-3 SAX2 callback methods DOM level2 DOM hierarchy Example 3-5 Sample XML document Sample generated DOM tree Jaxp Using Jaxp Example 3-6 Sample XML to Html transformation code Xslt support packages in Jaxp Stylesheet compilation Introduction to IBM WebSphere Application Developer WebSphere Studio product family WebSphere Studio family WebSphere Studio Site Developer Advanced WebSphere Studio Application Developer WebSphere Studio Application Developer Integration Edition WebSphere Enterprise Developer Tools Web development tools Relational database tools XML tools Web services development tools Java development tools Debugging tools EJB development toolsTeam collaboration Server tools for testing and deployment Performance profiling tools Plug-in development tools Plug-in projectFragment project Plug-in component Application Developer XML Tools XML perspective Window-Open Perspective-XML XML perspective editors XML editorCreating an XML file from scratch Select the option Create XML file from scratch Editing an XML file XML editor Creating a DTD from scratch DTD editorValidating the XML file Using the Outline view to add DTD components DTD Editor Validating DTD Creating a schema from scratchXSD editor Using the Outline view to add schema components XML Schema Editor Pop-up on schema file in the Outline view Making changes and referential integrity Validating schema Namespace XSL editor Creating an XSL file from scratch Validating the XSL file Namespace supportEditing an XSL file Indicate all local elements to be qualified XPath support XPath Builder 10 XPath definition 11 XPath Operators 12 XPath functions XSL debugger 13 XPath Query Result screen 14 XSL Debugger Web service wizard Web services supportWeb Service Dadx group configuration wizard Application Developer XML Tools Page RDB and XML integration 101 SQL to XML wizards Passenger List Select statement SQL to XML wizard panel Example 6-1 XSL file for Show table columns as ‘Elements’ Show table column as optionXML and XSL files Html XML file generated with the Elements option Html file Html with the ‘Recurse through foreign keys’ unchecked Html generated for Foreign key as links option XML Schema file Aircraft Html generated for ‘Foreign key as links’ option RDB and XML integration 076/schema Sequence Example 6-4 XML Schema for Aircraft table DTD file Page Query template file Flight Cdata #REQUIRED Statement Options XML to SQL wizard Example 6-9 Customer.xml XML to SQL wizard Selecting the connection 10 XML to SQL wizard Selecting Schema and Action DDL to XML Schema wizard 11 XML to SQL wizard Selecting the column 12 Generate XML Schema Example 6-10 XML Generated through the DDL to XML Schema Restriction base=string length value=30 SimpleType Element Example 6-11 XML Schema for a single table using a Select DB2 XML Extender XML Extender 13 shows an overview of the XML Extender UDTs created Administrative support tables, UDTs, and UDFsAdministrative support tables created Stored Procedures created UDFs created DTD Repository Document Access Definitions DAD Example 6-12 DTD representation of a bookPage When to use XML Column method XML Column method XML Collection Elements/attributesAs is xml document When to use XML Collection method 15 XML Collection Method overview Mapping schemes for XML collections Example 6-14 Sample DTD SQL mapping Employee table in Sample database Column name Data type Empact Table in Sample database RDBnode for the top elementnode Example 6-16 The RDBnode Example 6-17 RDBnode mapping XML Extender administration toolsRDBnode for each attribute and textnode XML MQSeries enablement RDB and XML integration Page 145 Click Finish Select passengerList.dtd Right-clickGenerate-XML SchemaDTD XSD XML DTD/XSD Create an XML file from a DTD file Create an XML file from an XSD file Create DTD/XSD files from XML Select Select file from Workspace optionSelect passengerList.xsd Right-clickGenerate-XML File Example 7-1 Customer.xml Example 7-2 Customer DTD Select Customer.xml Right-clickGenerate-XML SchemaSelect customer.xml Right-clickGenerate-DTD Example 7-3 Customer.xsd Generate a Html from an XSDSelect passengerList.xsd file Right-clickGenerate-HTML Doc Select J2EE Web Application Project. Click Next JavaBeans from DTD/XSDClick File-New-Project Generate XML/XSL from JavaBeans Select passengerList.xsd Right-clickGenerate-JavaBeansSelect Generate sample test program. Click Finish Example 7-4 passenger.javaPage Click File-New-Java Bean XML Client Input XML Form screen Generate XML/XSL from Html Click File-New-Other Preparing the Html file for generation Adding annotation tags Example 7-5 cus-template.xhtml Example 7-6 Customer.xml Select cus-template.xhtml Right-clickGenerate-XSL FileSelect Customer.xhtml. Click Next Page Part 3 XML application development 161Page WebSphere and XML approaches 163 XML in Application development Web services Passenger List application Solution Outline Web Services ServletXML in this application Client Web Tier Technical implementation overview Development and running of the Passenger List applicationPage Advantages of using the database Discussion Enterprise JavaBeans Interprise Application Server Customer Registration application Technical overview Page Developing XML Web services 177 Creating the Web tier Servlet Create the Airline simple project Name Type Create the Travel Web project Design the XML SchemaSelect File-New-XML Schema Select root node PassengerList DOM Tree Creating XML Schema XML Schema Example 9-1 PassengerList.xsd Generate XML file Design an outputHtml and mapping approach Example 9-2 Static XML file Example 9-4 html.xml source Select required and optional content, click FinishExample 9-3 html.dtd Generate an XSL file XML to Html mapping Mapping XML to Html Source Target Create an XSL from scratch Generating XSL from Xhtml Testing the XSL Developing the servlet Javax.xml.transform.Source Example 9-5 GetPassengerList Server doGet method Test the passenger list application Compiling XSLJavax.xml.transform.TranfrormerFactory Javax.xml.transform.Transformer Creating a Web service 11 XML Web service Create the database tier Click Window-Open Perspective-DataRight-clickNew Connection Right-clickImport to folder Generate DTD file PassengerList.xsd-Generate-DTD Figure Loading DTD into XML Extender 13 Generated DTD File Select RDB Table to XML Mapping, click Next Creating DAD file using RDB to XML mappingMembership Click Mapping-Edit Join Conditions 15 Edit Join Conditions Select passengerList.rmx 16 RDB to XML mapping Create the Web Service from Dadx file DAD Extension Web services and DB2 XML Extender Dadx Group Group.properties File Generating the Dadx Next Dadx operations 18 Dadx Generation RetrieveXML StoreXML Deploying the Web serviceExample 9-6 Updated Dadx file 19 Web Service settings Example 9-7 namspacetable mapping entry Test the Web Service 20 Testing Web Service Modify passenger list application to use the Web Service Mapping DTDIDs to XSD namespaces and locations Modifying the XSL file Example 9-8 NamespacesExample 9-9 Changing root element Example 9-10 passengerList.xslPage Creating Html input form Center Using Java proxy 22 Input form GetPassengerList.html Conclusion 23 passengerList resultPage Development of XML-based Enterprise applications 215 Multi-tier solution architecture XML based Enterprise application architecture Solution outline for customer registration sample Customer registration Retrieving customer information Customer registration scenario outline Developing the customer registration sample Retrieving customer data scenario outline Preparing to create the Web tier JavaBean to XML client wizard Customer JavaBean class specification Creating the Web tier JavaBean XML/XSL client wizard JavaBean XML/XSL client JavaBean selection JavaBean XML/XSL client methods and properties selection JavaBean XML/XSL client input form design 10 JavaBean XML/XSL client results form design 11 JavaBean XML/XSL client prefix specification Investigating the Web-tier generated filesPage ProduceDOM Document Org.w3c.dom.DocumentJava Bean XML Data Example 10-2 Source code for CustomerXSLServlet init method Development of XML-based Enterprise applications Xslt Processor Stylesheet Transformer ProduceDOMDocumentXML Document Example 10-4 Source code for the servlet doPost method Form action=/Registration/CustomerXSLServlet method=post Membership Example 10-10 Sample of CustomerResult stylesheet form Example 10-12 Schema file for the XML data Validating the Web tier Building the entity EJB and the database schema 15 Customer registration form Project configuration EJB mapping approaches reviewPreparing to create the entity EJB Creating the entity EJB 17 Create an Enterprise Bean wizard Creating the database mapping and tables 18 Enterprise bean details 19 EJB to RBD Mapping wizard for CustomerInfo module 20 Target database specification 21 EJB to RDB mapping editor Access beans 22 Database connection definition Creating an access bean for the entity bean 23 Access Bean creation wizard Creating a Jdbc data source 24 Data source definition for a server configuration Binding the EJB to a Jdbc data source 25 Jdbc data source definition Integrating the entity EJB with the Web tier Modifying CustomerXML 27 CustomerInfoWeb project properties Example 10-13 create source code Modifying CustomerXSLServlet Example 10-14 CustomerXSLServlet doPost source code Application deployment and testing Retrieval functionExample 10-15 Retrieval function Example 10-16 Confirming the creation Testing the registration application 28 Generating the deployed code for the EJB 29 Customer Registration form Page Light weight XML-based Enterprise Application 257 SQL-XML solution architecture SQL to/from XML libraries Light weight XML-based Enterprise Application Customer registration Retrieving customer information XSL Servlet Adding the libraries to the project XML Document format XMLToSQL architecture Converting an XML Document XMLToSQL Modifying CustomerXSLServletInitializing the XMLToSQL class Example 11-1 initSQLProperties method Creating an XML DocumentModifying the produceDOMDocument method We need to change to Example 11-2 ProduceDOMDocumentforTools Executing the XMLToSQL class Example 11-3 CustomerXSLServlet doRegister method Example 11-5 The xslif tag Modifying the doPost methodExample 11-4 CustomerXSLServlet doPost method Adding the error case Example 11-6 Customer.XSL firstname template Retrieving a customer JdbcDriverStatement Format Example 11-7 initQueryProperties method Initializing the SQLToXML classSQLToXML Executing the SQLToXML class Example 11-8 CustomerXSLServlet doQuery method Example 11-10 showPage method Modifying the showPage methodExample 11-9 CustomerXSLServlet doPost method for query Example 11-12 Customer.XSL membership template Modifying the doGet methodExample 11-11 showPage method Example 11-13 Result XSL Page Using datasource with SQLToXML and XMLToSQL class Customer Registration form Class definition Getting the datasource Example 11-15 setDatasourceMethods ConstructorsExample 11-14 setDatasourceMethods Execute methods Conclusion 11 Core data is an XMLPage Deploying your Web application 283 Manual deployment Exporting your project from Application Developer Installing the EAR file on WebSphere AEs Starting the WebSphere AEs Admin Console Installing the EAR Select Enterprise Applications Testing the application Publishing to a remote server AEs Creating a remote server instance Creating a remote server instance WebSphere Studio Application Developer Programming Guide Remote server instance settings Remote file transfer option Remote copy options WebSphere Studio Application Developer Programming Guide Publishing to remote server WebSphere Studio Application Developer Programming Guide Part 4 Appendixes 297Page 299 Things to do before installation Installing Application Developer WebSphere Studio Application Developer installation Selecting your workspace Select options Verifying the installation Programs-IBM WebSphere Studio Application Developer-IBM WebSphere Studio Application Developer Programming Guide 305 Hardware and software prerequisites Create groups and users Stop the Web server processes Install WebSphere Application ServerCheck that IP ports are unused 10 Installation options 11 Security options 12 Snoop servlet accessed through embedded Web server 311 Using the Web materialLocating the Web material How to use the Web material System requirements for downloading the Web material Abbreviations and acronyms 313 OTS IBM Redbooks Referenced Web sitesOther resources 315 How to get IBM Redbooks IBM Redbooks collections Index 317 Jaxp Wsaa Xacml Xsltc 48 Spine 475-0.875 250 459 pages Page Page XML Files