Web Services SOA Tutorial

Introduction to Web Services Technology

What is Web Services
Programming language and platform independent infrastructure for loosely-coupled, App2App communication over the Internet(Globe). 
A web service is a piece of business logic, located somewhere on the Internet, that is accessible through standard-based Internet protocols such as HTTP or SMTP. 
Web services framework is an XML-based distributed object/service/component system. Intended to support machine-to-machine interactions over the network.
Characteristics of Web Services
A web service has special behavioral characteristics:
XML-based: As a data transport, XML eliminates any networking, operating system, or platform binding that a protocol has.
Loosely coupled: The web service interface can change over time without compromising the client's ability to interact with the service.
Adopting a loosely coupled architecture tends to make software systems more manageable and allows simpler integration between different systems.
Supports Remote Procedure Calls (RPCs): Web services allow clients to invoke procedures, functions and methods on remote objects using an XML-based protocol.
Remote procedures expose input and output parameters that a web service must support
Ability to be synchronous or asynchronous
Synchronicity refers to the binding of the client to the execution of the service. In synchronous invocations, the client blocks and waits for the service to complete its operation before continuing.
Asynchronous operations allow a client to invoke a service and then execute other functions. Asynchronous clients retrieve their result at a later point in time, while synchronous clients receive their result when the service has completed.
Asynchronous capability is a key factor in enabling loosely coupled systems.
Supports document exchange
Web services support the transparent exchange of documents to facilitate business integration.
Why Web Service?
Interoperable - Connect across heterogeneous networks using ubiquitous web-based standards.
Economical - Recycle components, no installation and tight integration of software
Automatic - No human intervention required even for highly complex transactions.
Accessible - Legacy assets & internal apps are exposed and accessible on the web.
Available -Services on any device, anywhere, anytime. 
Scalable -No limits on scope of applications and amount of heterogeneous applications.
There are two kind of approach generally used to implement a Web Services: 
1. Code First Approach (Buttom-Up) :- In the Code First Approach, development of the service is started from a code. So the developer can write a service without knowing anything about WSDL. Code First approach is simple, less time consuming and easy to use for people who are not familiar with Web Services standards because WSDL is somewhat hard to understand and use for a beginner. Code First is a good approach to convert a lagacy code into a Web Services. 
2. Contract First Approach (top-Down Approach) :- In the Contract First Approach, development of the service is started from a WSDL definition, which becomes a contract between the service provider and the client. Once WSDl is finalize between the business, the client side and server work can start parallel on basis of finalized WSDL. This approach is more complex compared to Code First Approach and also it requires an in depth understanding of WEB Services. But it is the more popular and recommended. 

Web Services,SOA,Technology,Definition,loosely couple,xml based,code first,contract first,approach,top down,buttom up,tutorial and example.

Thanks! Please provide your input if any!


  1. Please tell one example of asynchronous webservice? how we can do?

    1. Great Article android based projects

      Java Training in Chennai

      Project Center in Chennai

      Java Training in Chennai

      projects for cse

      The Angular Training covers a wide range of topics including Components, Angular Directives, Angular Services, Pipes, security fundamentals, Routing, and Angular programmability. The new Angular TRaining will lay the foundation you need to specialise in Single Page Application developer. Angular Training

  2. Great article about intro of Web Services. At a glance, I got so much info about Web Service.
    Thanks for your clear-cut explanation.

    1. Thanks Jetti for your kind words, refer the more on http://www.tutorialbyexample.com/

  3. Must go on http://www.tutorialbyexample.com/search/label/Web%20Services all other examples.


  4. Thanks to admin for this Blog because I have read your whole site Content and shared to people your site is informative and people can take information from your site.

    BT Mail Login

  5. Hats off to your presence of mind..I really enjoyed reading your blog. I really appreciate your information which you shared with us.
    Best CRM System

  6. This is really awesome and full of knowledge. Skalable Technologies offers software with expertise in Microsoft and Oracle-NetSuite technologies.


Please provide your input, it will honer for me...