47 lines
2.9 KiB
HTML
47 lines
2.9 KiB
HTML
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<LINK rel="stylesheet" type="text/css" href="../../../rzahg/ic.css">
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<title>Web services overview</title>
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<SCRIPT LANGUAGE="Javascript" SRC="../../../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h2><A NAME="wsovr">Web services overview</A></h2>
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<p>A typical Web services scenario is a business application requesting a service from a given URL using Simple Object Access Protocol (SOAP) over a HyperText Transport Protocol (HTTP) transport. The service receives the request, processes it, and returns a response. Examples of a simple Web service include weather reports and stock quotes. The method call is synchronous, that is, it waits until the result is available. Transaction Web services, supporting quotes, business-to-business (B2B) or business-to-client (B2C) operations include airline reservations or purchase orders.</p>
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<p>The key components of a Web service are:</p>
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<ul>
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<li>Simple Object Access Protocol (SOAP)</li>
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<li>Web Services Description Language (WSDL)</li>
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</ul>
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<p>You can review the Web services client programming model in the Web services for J2EE specification available in the <a href="wsrefs.htm">Web services resources</a> topic. The programming model is similar to the EJB client programming model. There is a remote interface that the client uses to interact with the service. A Java Naming and Directory Interface (JNDI) lookup method can locate the service for a client running in a Web container or client container. The client obtains a stub that implements the remote interface and makes calls to invoke operations on the remote service.</p>
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<p>A WebSphere Application Server - Express Java Web service client can exist as one of the following entities:</p>
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<ul>
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<li>As an unmanaged stand-alone Java application.</li>
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<li>As a Java bean or a servlet running in a Web container that is acting as a client.</li>
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</ul>
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<p>These topics describe further concepts of Web services:</p>
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<blockquote>
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<p><strong><a href="wsarch.htm">Web services architecture</a></strong>
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<br>This topic discusses how Web service providers, brokers, and requesters interact to provide and run Web services.</p>
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<p><strong><a href="wsops.htm">Web services operations</a></strong>
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<br>This topic discusses the life cycle of a Web service, and the roles played by providers, brokers, and requesters in that cycle.</p>
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</blockquote>
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<p>IBM's AlphaWorks provides tools for creating Web Services Description Language (WSDL) files and Simple Object Access Protocol (SOAP) clients and describes working examples. For more information, see <a href="http://www.alphaworks.ibm.com/tech/webservicestoolkit" target="_">http://www.alphaworks.ibm.com/tech/webservicestoolkit</a> <img src="www.gif" width="18" height="15" alt="Link outside Information Center" border="0">.</p>
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</body>
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</html>
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