Java API for XML Web Services (JAX-WS) is a set of APIs for creating web services in XML format (SOAP). The JAX-WS 2.2 specification defines a standard Java- to-WSDL mapping which determines how WSDL operations are bound to Java methods when a SOAP message invokes a WSDL operation. This Java-to-WSDL mapping determines which Java method gets invoked and how that SOAP message is mapped to the method’s parameters. This mapping also determines how the method’s return value gets mapped to the SOAP response.
Here is a list of simple JAX-WS/Web Services tutorials with examples.