Mumbai University > Information Technology > Sem 4 > Web Programming

Marks: 5M

Year: Dec 2014

• Web Service is a software system designed which is independent of specific hardware or software on which it is running.
• Web Service fulfills the need of open standards, vendor independence and cost effective solution for business application. It uses open standards like XML, SOAP, WSDL, etc.
• Web Services are used for exchanging data over large network and performing transactions.
• Web Service contains various elements:
  • At the lowest level of web services, there are simply XML files that are for data level description.
  • SOAP (Simple Object Access Protocol) is a simple XML based protocol which allows exchanging of massage over HTTP.
  • WSDL (Web Service Description Language) is used for abstraction description of web services. The description is provided in XML document.
  • UDDI, i.e. Universal Description and Discover Integration, provides a registry of web services, so that client can easily discover the services as per need.

• A web Service provider registers a service in UDDI registry. A Web Service consumer will send a request to use web service.
• UDDI provides WSDL to invoke services to the Web Service Provider and returns the same to web service consumer.
• In this way, a service is invoked between web service consumer and web service provider.
• For Example, a user wants to book online tickets; he enters the details and submits, web service will be invoked to provide results for user’s action.