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Consuming Web services

Use Rational Application Developer to create and consume Web services

Kunal Mittal (kunal@kunalmittal.com), Portal/J2EE Architect, Freelance Developer

Kunal Mittal is a consultant specializing in Java™, Java 2 Platform, Enterprise Edition (J2EE), and Web services technologies. He is the co-author of and has contributed to several books on these topics. Kunal is currently working on a portal project for Sony Pictures Entertainment. For more information, visit his Web site at http://www.soaconsultant.com.

Summary: This tutorial explains the basic elements of a Web service and shows how you can use IBM Rational Application Developer to build, consume, deploy, and test Web services. You also learn how to consume an external Web service taken from the xmethods.net site.

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Date: 13 Apr 2005
Level: Introductory
PDF: A4 and Letter (2244 KB | 43 pages)Get Adobe® Reader®

Activity: 11179 views
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Before you start

Learn what to expect from this tutorial, and how to get the most out of it.

About this tutorial

Web services provide a way for applications to easily communicate using common protocols, which allows for collaboration both across platforms and across time zones. To a developer who hasn't used Web services before, however, just understanding all the acronyms can be a challenge. Messages can be exchanged using text-based XML, so any system can read them; protocols such as the Simple Object Access Protocol (SOAP) can define their content so that systems recognize what they're looking at. You can describe entire messaging systems using a Web Services Definition Language (WSDL) file and publish information about the service in a Universal Description, Discovery, and Integration (UDDI) directory for companies to find.

Fortunately, using Web services doesn't require learning about all of the different technologies -- if you have the right tools. IBM® Rational® Application Developer Version 6.0 (or IBM Rational Web Developer Version 6.0) enables you to create and use Web services without knowing anything about XML, SOAP, or any of the other acronyms involved.

In this tutorial, you will:

Learn how different technologies interact to make Web services work
Wrap a simple inventory-control application as a Web service
Test the Web service
Browse the code for the Web services consumer
Build a Web services client for an external Web service
Test the external Web service
Build a WSDL file
Convert a WSDL file into a Web service

System requirements

To run the examples in this tutorial, you need the following software:

Rational Application Developer Version 6.0 (download the latest trial version) or Rational Web Developer Version 6.0 (download the latest trial version).
Apache Tomcat Version 5.0. You can use Apache Tomcat Version 5.0 or later.
Sample files. To start you off, this tutorial includes a simple Java™ class, which you can download.

See Resources for related tutorials if you need to get a jump start. Familiarity with Java technology is also strongly recommended.

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