WebSphere Application Server - IBM Redbooks

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11.1 Web services overview What is a Web service? As you might already have observed, Web service has recently become one of the highly overloaded terms in the IT industry. In this publication, we use the following widely accepted definition: Web services are self-contained, self-describing, modular applications that can be published, located, and invoked across the Web. Let us further explain the information contained in this definition. Web services are self-contained On the client side, no additional software is required. A programming language with XML and HTTP client support is enough to get you started. On the server side, a Web server and a servlet engine are required. It is possible to Web service enable an existing application without writing a single line of code. Web services are self-describing Neither the client nor the server knows or cares about anything besides the format and content of request and response messages (loosely-coupled application integration). The definition of the message format travels with the message; no external metadata repositories or code generation tools are required. Web services can be published, located, and invoked Some additional standards that are required to do so are: ► Simple Object Access Protocol (SOAP), also known as service-oriented architecture protocol, an XML-based remote procedure call (RPC) and messaging protocol ► Web Service Description Language (WSDL), a descriptive interface and protocol binding language ► Universal Description, Discovery, and Integration (UDDI), a registry mechanism that can be used to look up Web services descriptions In this chapter we introduce each of these technologies. Web services are language independent and interoperable Client and server can be implemented in different environments. Existing code does not have to changed in order to have the Web service enabled. 356 IBM WebSphere Application Server - Express V5.0.2 Developer Handbook
Web services are inherently open and standards based XML and HTTP are the technical foundation for Web services. A large part of the Web service technology has been built using open source projects. Therefore, vendor independence and interoperability are realistic goals. Web services are dynamic Dynamic e-business can become reality using Web services because, with UDDI and WSDL, the Web service description and discovery can be automated. Web services build on proven mature technology There are a lot of commonalities, as well as a few fundamental differences to other distributed computing frameworks. For example, the transport protocol is text based and not binary. Let us now introduce the overall architecture of the Web services technology framework. 11.1.1 The concept of a service-oriented architecture (SOA) Each component in a service-oriented architecture can play one (or more) of three roles: service provider, broker, and requestor, which perform the operations shown in Figure 11-1 on page 358. Chapter 11. Working with Web services 357
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IBM WebSphere Application Server -
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Take Note! Before using this inform
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2.4.3 JavaServer Pages. . . . . . .
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8.3 Using JSPs in the Online Catalo
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13.1.1 Configuration and management
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16.5.1 Adding JAAS authentication t
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xii IBM WebSphere Application Serve
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Trademarks The following terms are
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Information Systems. His areas of e
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xviii IBM WebSphere Application Ser
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1.1 What is IBM WebSphere Applicati
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► A Web container ► Web service
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1.1.7 Roles and responsibilities In
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► Migrating Applications from IBM
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1.3 Bringing up Studio Site Develop
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illustrates techniques for internat
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Figure 1-4 Customer service example
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From a lower-level perspective, we
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2.1 Design considerations e-busines
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Note: WebSphere Application Server
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Note: WebSphere Application Server
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Actors can be identified by asking
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The maintain inventory use case has
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Input Page (View) Display Page (Vie
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In the following sections, we discu
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Figure 2-9 Dependencies allowed in
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2.4.4 Tag libraries ► Separation
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2.4.7 Struts Struts is an open-sour
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2.5.2 Indexes Third normal form In
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CUSTOMER CUSTOMER_ID :CHAR(10) CUST
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42 IBM WebSphere Application Server
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3.1 The workspace Studio Site Devel
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Figure 3-2 Compare with Local Histo
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Shortcut bar Figure 3-4 Web perspec
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3.2.2 Using fast views 1. From the
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New icon Figure 3-6 Designating a v
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3.3 Finding help ► Select a defau
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The online help is laid out in an e
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4.1 Enterprise application An enter
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Elements contained within a Web app
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► A set of initialization paramet
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Some elements of Example 4-1 on pag
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Although this wizard allows you to
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Figure 4-4 Creating a Web Project 5
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► WebContent: The location of all
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5.1 HTML support in Studio Site Dev
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Project Navigator view The Project
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2. From the Thumbnails view, drag t
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Colors view Figure 5-5 Setting colo
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Palette view The Web tools Palette
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► Double-Click Support: you can d
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Figure 5-9 Servers view When a serv
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Tip: When you place the cursor with
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Important: Using Web Site Designer
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Important: If a Web page icon has b
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Item Sub Item Category Description
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Figure 5-16 Associated page icon Pa
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Inserting a navigation trail You ca
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Example 5-1 spec.html [ < !-- site
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An example of a page template you w
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d. Select HTML or XHTML as the Mark
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header.html menu.html Figure 5-20 W
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5.1.7 Adding tables, links, text, a
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Figure 5-23 Adding a link These val
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5.1.9 Working with style sheets Sty
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5. Select the Link radio button fro
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the WebArt Gallery tab and the Gall
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Figure 5-27 Using the WebArt Design
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Figure 5-29 Grouping objects You wi
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Figure 5-30 Type of frames Creating
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The animation is played starting wi
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Figure 5-36 WebSphere Studio Animat
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3. To add our company name to the W
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Figure 5-39 Set Selector of New Sty
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Figure 5-41 Add Style dialog 17.Cli
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Figure 5-44 WebSphere Studio Art De
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Figure 5-46 Opening Web Site Design
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Figure 5-49 Creating an HTML page 7
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Figure 5-51 index.html opened in Pa
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Figure 5-53 Runtime of index.html 1
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152 IBM WebSphere Application Serve
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6.1 Java Database Connectivity (JDB
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Using databases in an application i
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6.2.2 Creating the database Althoug
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3. This will open the The New Datab
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Note that the class location points
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Figure 6-7 Create a schema 2. Enter
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SHIPPING_ORDER table The SHIPPING_O
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Figure 6-9 Create the table columns
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The next logical step is to create
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Figure 6-13 Execute the DDL - step
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To access the DB Output view: 1. Cl
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Java package: During the wizard you
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Note: You can use this same process
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Figure 6-20 Select the tables 9. Mo
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Figure 6-22 Database select conditi
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Figure 6-24 The generated SQL state
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Figure 6-26 Defining the controller
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Figure 6-27 Design the input form 7
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Figure 6-28 Design the master view
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Figure 6-30 Renaming the Web pages
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PRICE ASC This does two things.
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In order to run the application usi
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► How credentials are passed to t
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6.2.9 Testing We have not looked at
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Figure 6-36 Select database and dri
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Figure 6-38 Finished JDBC 8. With t
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Figure 6-40 Data source information
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Figure 6-41 JDBC connection paramet
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Figure 6-43 Server variables page 1
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SQL statement you want to build fro
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7.1 Servlet overview The servlet me
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The service() method is called with
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7.1.3 Servlets in an enterprise app
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Figure 7-3 Package wizard 7. Click
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7.2.2 Web perspective The Web persp
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Figure 7-6 Content assist Content a
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Figure 7-8 Quick Fix Outline view A
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Figure 7-11 Details - URL Mappings
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Figure 7-17 WebSphere extensions 7.
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Figure 7-19 Servlet wizard - screen
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Figure 7-21 Servlet wizard - screen
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Get data from HTML form String user
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7.4 References Some additional refe
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8.1 JSP overview In the early days
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In fact, in WebSphere’s JSP imple
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8.1.3 JSP 1.2 elements The JSP 1.2
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Directives Directives give a way to
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A point of note concerns the sessio
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Note: After deployment to a server,
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The syntax for expression tags is:
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The include action tag works in fas
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Note: You would not have the conten
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The list you see is relevant to the
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Figure 8-7 Outline view Palette vie
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5. You have three options for proce
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In this example, we will be buildin
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Figure 8-11 Adding tag files For ou
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Figure 8-13 Add the JSP to web.xml
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INSERT INTO DB2ADMIN.ITEM( ITE
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9.1 Custom tag library (taglibs) co
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9.1.2 When to use ► Controller lo
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These are: - TagExtraInfo: Provides
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This variable will store the name a
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The TLD contains two main elements,
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It is possible to avoid the need to
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9.2 Studio Site Developer and tag l
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Figure 9-3 Importing a tag library
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3. From the first Import window sel
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Figure 9-7 Adding the Validtag tagl
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9.2.3 Snippets view The Snippets vi
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Page tag library (from Jakarta) The
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Tip: If you want to see how the tag
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Each taglib is different and will h
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9.3.2 Step 2: Adding a taglib direc
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Page 404 and 405: 12.1 Struts overview Struts is an o
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Figure 12-11 Action wizard - In the
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- If you want to specify a form bea
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- If you want to reuse an existing
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g. If you want to create method stu
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c. Specify the name of the Java pac
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10.On the Design the Form page, you
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Note: The Exception wizard can also
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5. Type the name of the new Struts
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d. If you want to associate the Web
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12.2.8 Data Mappings view The Strut
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Note: We did not follow this sample
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Note: The Web diagram file (*.gph)
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Important: Notice that the icons ar
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Important: Notice that the connecti
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You will notice that there is a war
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Example 12-5 Adding a html text tag
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23.Save your changes and exit the P
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Admin2 page The admin2.jsp page wil
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Figure 12-31 Creating an ActionForm
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The method returns errors if either
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Example 12-13 LoginAction class pub
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Figure 12-35 Local forwards for the
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Example 12-14 LogoutAction class pu
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Important: If you use the Struts fr
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The ActionServlet handles the reque
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13.1 Application server overview We
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Application developer Internet user
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Note: The Web perspective also cont
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13.3 Defining servers and server co
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Figure 13-6 Creating servers and se
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3. Update the server configuration
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13.4.2 Publishing an application to
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Note: If you have not changed the s
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Figure 13-13 Check the console for
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Tip on setting a server preference:
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The following are the steps require
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Figure 13-18 Define the remote serv
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Figure 13-20 Defining the copy sett
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Figure 13-21 Deployed application f
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The server configuration can be ope
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► Trace: Allows you to enable Web
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Note: You can also start the server
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3. Enter the EAR file name to expor
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Example 13-2 IBM Agent settings
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14.1 Debugging in the Web perspecti
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Figure 14-2 500 page error These er
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14.1.4 Editors Note: The Tasks view
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► Standard output: Default color
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Figure 14-7 Debug perspective Break
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Note: For additional information on
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Figure 14-12 Breakpoint properties
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Figure 14-13 Setting a breakpoint i
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Note: For additional information ab
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Figure 14-17 Breakpoint view 14.3.3
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15.1 Team development with CVS CVS
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15.2 Team environment using Studio
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d. Select the connection type (auth
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Note: When you share a project you
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15.4.2 Copy (commit) the project to
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It makes sense to do this when you
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Figure 15-5 Viewing the project ver
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15.6 Working with the team using th
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Figure 15-8 Working with conflicts
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► Current change: In the Text Com
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If there is a conflict, use the Tex
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► Based on the project in your wo
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Tip: You can see existing branch na
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Developer 1 (maintenance developer)
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You will find the following informa
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When such a situation occurs, you w
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Figure 15-16 File (text) compare ed
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16.1 Terms Before starting this top
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Figure 16-1 Web module deployment d
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16.4 Securing applications with rol
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2. Define roles to represent a logi
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Figure 16-4 Add a role Define the c
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Figure 16-6 Adding a constraint 3.
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Assign a role to the constraint Wit
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Figure 16-10 Enterprise application
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Tip: If you are using Internet Expl
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} // get the principal from the req
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Figure 16-13 JAAS security 6. Save
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This configuration allows access to
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Enabling security when installing D
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16.7 Using SSL with applications Th
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Note: For additional SSL informatio
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Wizard The Template application wiz
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Icon Name Description Web Pages Sec
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Figure A-3 Template application pre
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Figure A-5 Template selection 5. Cl
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Figure A-7 Application properties p
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Figure A-9 Database connection page
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- Up moves the widget up within the
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► Different versions of a feature
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Figure B-3 Install configuration vi
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Feature updates view The Feature up
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Figure B-7 Feature install wizard -
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Figure B-9 Feature install wizard -
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Figure B-11 Available updates searc
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Figure B-12 My computer folder 610
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Online Catalog sample application o
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SHIPPING_ORDER table The SHIPPING_O
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Homepage XST file calls Servlet Fig
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Item Folder/Package Description adm
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Catalog Item Folder/Package Descrip
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Note: To add items to the wishlist
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session.setAttribute("att1", o); ..
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Figure C-7 Web site diagram view of
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Figure C-8 theme folder Deployment
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Table C-11 Servlet login items Item
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Item Folder/Package Description Log
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Using the Web material The addition
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Update the FeaturedItemXMLServlet s
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15.On the Create a Resource Propert
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Other resources These publications
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► Java Authentication and Authori
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oker 357 BSF 32 buffer attribute 24
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host variable 184, 187 HTML 60 crea
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460, 466, 522, 527, 529, 540-541 XM
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Session 297-298, 300-301 Sslext 300
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XML schema editor graph view 328 xm
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