Introduction to web services:

TUTIORALS FROM MADHAV:

JAVA-SERVLETS JAVA-JDBC JAVA-JSP HIBERNATE-SHCEMABASED

SPRING-DATA-JPA REST-WEB-SERVICE STRUTS2HIBERNATE GWT....

1.What are web services?

2.Types of web servicesa

Web services are client and server applications that communicate over the World Wide Web (WWW) hyper text transfer protocol (HTTP)
As described by the www consortium (W3C), web services provide a standard means of interoperating between software applications running on a variety of platform and frameworks.
Web services are characterized by great interoperability and extensibility, as well as the machine-process able descriptions,
Web services can be combined in a loosely coupled way to achieve complex operations.
Programs providing simple services can interactive with each other to deliver sophisticated added value services.

The two types:

1.big web services

2.restful web services.

In java, jax-ws provides the functionally for big web services.
Big web services use XML messages that follow the simple object access protocol (SOAP) standard, an xml language defining a message architecture and message formats.
Such systems often contain a machine-readable description of the operations offered by the service, written in the web services description language (WSDL),and xml language for defining interfaces syntactically.
The soap message format and the WSDL interface definition language have gained widespread adoption.
Many development tools, such as netbeans IDE, can reduce the complexity of developing web service applications.
A SOAP –based design must include the following elements.
A format contract must be established to describe the interface that the web service offers.
WSDL can be used to describe the details of the contract, which may include messages,Operations, bindings, and the location of the web services
In java EE6 ,JAX-RS provides the functionality for representational state transfer(restful) web services.
Rest is well suited for basic, ad hoc integration scenarios.