Java Web Services CSCI 4300 Diagrams from the Sun Java Web Services Tutorial,

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Presentation transcript:

Java Web Services CSCI 4300 Diagrams from the Sun Java Web Services Tutorial,

What are Web Services? Business-to-Business (B2B) communication Packaged in XML “SOAP” messages

Example: Travel Agent

Service-Oriented Architecture (SOA) Needs: 1. 1.Mechanism for discovering services (registry) 2. 2.Language for specifying service contract (Web service semantic)

Simple Object Access Protocol (SOAP) Envelope: top-level element, represents entire message Header: optional info to guide delivery and processing by multiple actors, e.g. shipping, logging, accounting Body: contains request / response info Fault: carries error messages <?xml version="1.0"?

Interfacing SOAP with Proprietary business process

Example: SOAP over AJAX Using a “WS” package to handle SOAP encoding

XHttpRequest lifecycle

Java XML Binding (JAXB) Marshalling: collecting data into XML Binding: generating Java classes to represent XML

How Binding Works

Old-school remote Java: RMI

Remote Java using Web Services Model (JAX-RPC)

Another View of JAX-RPC This shows the JAX- RPC runtime and HTTP/SOAP transport In this case client and server are both Java

Yet Another View Showing the role of WSDL to coordinate client and server In his case the client is not necessarily in Java!

Java XML Registry (JAXR) Java API overlaid on native registry systems A registry allows location of objects

WSDL (Fujitsu version)

WSDL (Sun version)

UDDI Architecture

Acknowledgements Webservices strategy: SOAP/proprietary interface: SOAP over AJAX diagrams: Web services architecture: Fujitsu WDSL diagram: xml.fujitsu.com RPC diagrams: rpc.htmlhttp:// rpc.html “Figure 1”: JAX-J2EE :