Web Service
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Web services allow software systems to communicate over a network using XML and HTTP. They expose functions or messages that can be accessed remotely. This converts applications into web applications that can share functionality worldwide using standards like SOAP, WSDL, and UDDI. Web services use different styles like RPC, SOA, and REST and can be designed using top-down or bottom-up methodologies.
Web Service
- 1. Web Service a brief introduction
- 2. Definition W3C: A web service is "a software system designed to support interoperable machine-to-machine interaction over a network. Internet Web service WSDL Interface SOAP Service Provider Service Requester XML / HTTP Web services use XML to code and to decode data, and SOAP to transport it Service Requester
- 3. How it works Can be accessed over a network and executed on a remote system hosting the requested services. using HTTP with an XML serialization
- 4. Impact Converts your application into a Web-application, which can publish its function or message to the rest of the world Can be used for SOA Make the applications inter-operable
- 5. Styles of Use RPC - implemented by mapping services directly to language-specific functions or method calls SOA - where the basic unit of communication is a message, rather than an operation. REST - the focus is on interacting with stateful resources, rather than messages or operations.
- 6. Design methodologies Simpler approach using the "bottom up method" first writes the implementing class in a programming language, and then uses a WSDL generating tool to expose its methods as a web service. A developer using the "top down method" first writes the WSDL document and then uses a code generating tool to produce the class skeleton, which she later completes. This way is more difficult but produces cleaner designs
- 7. What you should know? HTML XML Server side programming/scripting
- 8. What is SOAP? stands for S imple O bject A ccess P rotocol A protocol for accessing a Web Service a format for sending messages designed to communicate via Internet platform independent language independent based on XML simple and extensible allows you to get around firewalls a W3C standard
- 9. What is WSDL? an XML-based language for locating and describing Web services. stands for Web Services Description Language based on XML used to describe Web services used to locate Web services a W3C standard
- 10. What is UDDI? stands for Universal Description, Discovery and Integration a directory service where companies can register and search for Web services. directory for storing information about web services a directory of web service interfaces described by WSDL communicates via SOAP built into the Microsoft .NET platform
- 11. Examples Currency conversion Weather Reports Translation services