Intoduction to web services

Intoduction to web services

• 2.
     Client and serverapplications that communicate over the World Wide Web's (WWW) HyperText Transfer Protocol (HTTP) A service is a software component provided through a network-accessible endpoint. The service consumer and provider use messages to exchange invocation request and response information in the form of self-containing documents that make very few assumptions about the technological capabilities of the receiver.
• 3.
  "Big" Web Services: useXML messages that follow the Simple Object Access Protocol (SOAP) standard , written in the Web Services Description Language (WSDL).   RESTful Web Services: Representational State Transfer . REST is well suited for basic, ad hoc integration scenarios.
• 4.
       The web servicesare completely stateless. A caching infrastructure can be leveraged for performance. The service producer and service consumer have a mutual understanding of the context and content being passed along. Bandwidth is particularly important and needs to be limited. Web service delivery or aggregation into existing web sites can be enabled easily
• 5.
   JAX-WS: ◦ Addresses advancedQoS requirements ◦ Support the WS-* set of protocols ◦ More secure & reliable  JAX-RS: ◦ Easier to write web applications ◦ Scalability ◦ Architectural simplicity
• 6.
  SOAP: XML languagedefining a message architecture and message formats. WSDL: an XML language for defining interfaces syntactically.
• 7.
   J2EE Tutorial 7