Chapter 5. SOAP-Based Web Services
SOAP-Based Web Services are defined as JSR 224, and the complete specification can be downloaded.
SOAP is an XML-based messaging protocol used as a data format for
exchanging information over web services. The SOAP specification defines an
envelope that represents the contents of a SOAP message and encoding rules
for data types. It also defines how SOAP messages may be sent over different
transport protocols, such as exchanging messages as the payload of HTTP
POST. The SOAP protocol provides a way to
communicate among applications running on different operating systems, with
different technologies, and different programming languages.
Java API for XML-Based Web Services (JAX-WS) hides the complexity
of the SOAP protocol and provides a simple API for development and
deployment of web service endpoints and clients. The developer writes a web
service endpoint as a Java class. The JAX-WS runtime publishes the web
service and its capabilities
using Web Services Description Language (WSDL). Tools provided by a
JAX-WS implementation, such as wscompile by the JAX-WS
Reference Implementation, are used to generate a proxy to the service and
invoke methods on it from the client code. The JAX-WS runtime converts the
API calls to and from SOAP messages and sends them over HTTP, as shown in
Figure 5-1.
In addition to sending SOAP messages over HTTP, JAX-WS provides XML-over-HTTP protocol binding and is extensible to other protocols and transports. The XML-over-HTTP ...
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