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Web Services, SOAP and Java

Web Services, SOAP and Java. Derek Munneke AJUG / ACS Java SIG November 2001. What is a Web Service?.

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Web Services, SOAP and Java

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  1. Web Services, SOAP and Java Derek Munneke AJUG / ACS Java SIG November 2001

  2. What is a Web Service? Web services are a new breed of Web application. They are self-contained, self-describing, modular applications that can be published, located, and invoked across the Web. Web services perform functions, which can be anything from simple requests to complicated business processes...Once a Web service is deployed, other applications (and other Web services) can discover and invoke the deployed service. [ http://www6.software.ibm.com/developerworks/education/wsbasics/]

  3. What is SOAP? • Simple Object Access Protocol SOAP is a lightweight protocol for exchange of information in a decentralized, distributed environment. It is an XML based protocol that consists of three parts: an envelope that defines a framework for describing what is in a message and how to process it, a set of encoding rules for expressing instances of application-defined datatypes, and a convention for representing remote procedure calls and responses. SOAP can potentially be used in combination with a variety of other protocols; however, the only bindings defined in this document describe how to use SOAP in combination with HTTP and HTTP Extension Framework. [ http://www.w3.org/TR/SOAP/ (1.1)]

  4. What is SOAP 1.2? • Simple Object Access Protocol SOAP version 1.2 is a lightweight protocol for exchange of information in a decentralized, distributed environment. It is an XML based protocol that consists of four parts: an envelope that defines a framework for describing what is in a message and how to process it, a transport binding framework for exchanging messages using an underlying protocol, a set of encoding rules for expressing instances of application-defined data types and a convention for representing remote procedure calls and responses. Part 1 (this document) describes the SOAP envelope and SOAP transport binding framework; Part 2[1]describes the SOAP encoding rules, the SOAP RPC convention and a concrete HTTP binding specification. [ http://www.w3.org/TR/soap12-part1/ (1.2 Working Draft)]

  5. History of SOAP • SOAP 0 (1998) • Microsoft, DevelopMentor • XML-RPC (1998) • Subset of SOAP • ebXML (1999) • Electronic Business XML • Messaging for multiparty transactions • SOAP 1.0 & 1.1 (2000) • SOAP 1.2 (2001 working draft) • Messaging and RPC

  6. SOAP Node • Sender • Receiver • Intermediaries • Actors (v1.1)

  7. SOAP Message • Envelope • Header • actor attribute • mustUnderstand attribute • Body • Fault • Fault Code • VersionMismatch • MustUnderstand • DataEncodingUnknown • Client • Server

  8. Example SOAP Message <env:Envelope xmlns:env="http://www.w3.org/2001/09/soap-envelope"> <env:Header> <n:alertcontrol xmlns:n=http://example.org/alertcontrol> <n:priority>1</n:priority> <n:expires>2001-06-22T14:00:00-05:00</n:expires> </n:alertcontrol> </env:Header><env:Body> <m:alert xmlns:m="http://example.org/alert"> <m:msg>Pick up Mary at school at 2pm</m:msg> </m:alert> </env:Body> </env:Envelope>

  9. Java and XML • XML makes data portable • Java makes code portable

  10. Java API’s for XML • JAXP : Java API for XML Processing • SAX : Simple API for XML Processing • DOM : Document Object Model • JAXB : Java API for XML Binding • JAXM : Java API for XML Messaging • SOAP 1.1 • JAXR : Java API for XML Registries

  11. References • To be supplied… • Presentation to be published:http://www.ajug.org.au/sajug/meetings

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