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Web Service Support

  • Web services are web-based enterprise applications that use open, XML-based standards and transport protocols to exchange data with calling clients. The J2EEplatform provides the XML APIs and tools you need to quickly design, develop, test, and deploy web services and clients that fully interoperate with other web services and clients running on Java-based or non-Java-based platforms.
  • The translation of data to a standardized XML-based data stream is what makes web services and clients written with the J2EE XML APIs fully interoperable.
  • It is not like one should pass data in the xml format but it can be any type of data like plain text, audio, video, maps, programme files.


     

XML

  • XML is a cross-platform, extensible, text-based standard for representing data.
  • It helps in reusability of the data being processed for Example
    • One company might put XML pricing information through a program to translate the XML to HTML so that it can post the price lists to its intranet.
    • A partner company might put the XML pricing information through a tool to create a marketing presentation.
    • Another company might read the XML pricing information into an application for processing.


 

SOAP Transport Protocol

  • The XML based data transfer protocol between client- server and vice versa.
  • SOAP- Simple Object Access Protocol.
  • SOAP is an XML based protocol that follows the HTTP request-and-response model.
  • Defines XML envelope to describe what is there in the message and how to process the message.
  • Includes XML-based encoding rules to express instances of application defined data types within the message.
  • Defines an XML-based convention for representing the request to the remote service and the resulting response


 

WSDL Standard Format

  • It is used to describe the network services in the XML format.
  • The description describes the name, location and the way to communicate with the service.
  • WSDL service descriptions can be stored in registries or published on the web.


 

UDDI and ebXML Standard Formats

  • Other XML-based standards, such as Universal Description, Discovery and Integration (UDDI) and ebXML, make it possible for businesses to publish information on the Internet about their products and web services, where the information can be readily and globally accessed by clients who want to do business.
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