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Intro to Web Services

Intro to Web Services. Dr. John P. Abraham UTPA. What are Web Services?. Applications execute across multiple computers on a network. The machine on which web service resides is the REMOTE MACHINE. When clients uses a web service the class and compile DLL are stored on the Remote Machine.

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Intro to Web Services

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  1. Intro to Web Services Dr. John P. Abraham UTPA

  2. What are Web Services? • Applications execute across multiple computers on a network. • The machine on which web service resides is the REMOTE MACHINE. • When clients uses a web service the class and compile DLL are stored on the Remote Machine. • Remote machines superior computing power can be utilized as well.

  3. Web services • promotes software re-usability • promotes collaboration • Web service is a class • Whose methods can be called by methods running on other machines (see Simple Object Access Protocol in later slides). • Requests and responses are transmitted via SOAP

  4. Web services • The basic Web services platform is XML + HTTP • Web services platform elements • SOAP (Simple Object Access Protocol) • UDDI (Universal Description, Discovery and Integration) • WSDL (Web Services Description Language)

  5. SOAP • Simple Object Access Protocol. • SOAP is a communication protocol • SOAP is for communication between applications • SOAP is a format for sending messages • SOAP is designed to communicate via Internet • SOAP is platform and language independent (SOAP messages are written in XML) • SOAP allows you to get around firewalls • Most firewalls do not restrict XML & HTTP traffic.

  6. SOAP Interaction • When a program invokes a method, the request and all relevant information (parameters) are packaged in a SOAP message and sent to the Remote machine. • The Remote machine (server) parses the SOAP message for Method and parameters. • Response is sent as a SOAP message.

  7. UDDI • Like the yellow pages of Web services • Universal Description, Discovery and Integration • UDDI is a directory for storing information about web services • UDDI is a directory of web service interfaces described by WSDL • UDDI communicates via SOAP • UDDI is built into the Microsoft .NET platform

  8. WSDL • Web Services Description Language • WSDL is written in XML • WSDL is an XML document • WSDL is used to describe Web services • WSDL is also used to locate Web services

  9. Creating Web Services • Visual web developer and the .NET framework used to develop web services. • Creating a web service is known as Publishing. • Using a web service is known as Consuming. • The Web service has two parts: A proxy class representing the web service and a client application that access the web service via an instance of the proxy class.

  10. Creating a Web service • Visual Basic 2005 and Visual Web developer can create the proxy classes for you. • Several JAVA APIs facilitate web services. • Netbeans allows a programmer to publish and/or consume web services. • Requests and responses are created with JAX-WS, which are transmitted via SOAP

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