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What is Web Services?

Web services are the types of internet software that uses standardized messaging protocol over the distributed environment. It integrates the web-based application using the REST, SOAP, WSDL, and UDDI over the network. For example, Java web service can communicate with .Net application.

Features of web Services

  • Web services are designed for application to application interaction.
  • It should be interoperable.
  • It should allow communication over the network.

Components of Web Services

The web services must be able to fulfill the following conditions:

  • The web service must be accessible over the internet.
  • The web service is discoverable through a common mechanism like UDDI.
  • It must be interoperable over any programming language or Operating System.

Uses of Web Services

  • Web services are used for reusing the code and connecting the existing program.
  • Web services can be used to link data between two different platforms.
  • It provides interoperability between disparate applications.

How does data exchange between applications?

Suppose, we have an Application A which create a request to access the web services. The web services offer a list of services. The web service process the request and sends the response to the Application A. The input to a web service is called a request, and the output from a web service is called response. The web services can be called from different platforms.

What is Web Services

There are two popular formats for request and response XML and JSON.

XML Format: XML is the popular form as request and response in web services. Consider the following XML code:

The code shows that user has requested to access the DataStrutureCourse. The other data exchange format is JSON. JSON is supported by wide variety of platform.

JSON Format: JSON is a readable format for structuring data. It is used for transiting data between server and web application.

To make a web service platform-independent, we make the request and response platform-independent.

Now a question arises, how does the Application A know the format of Request and Response?

The answer to this question is "Service Definition." Every web service offers a service definition. Service definition specifies the following:

  • Request/ Response format: Defines the request format made by consumer and response format made by web service.
  • Request Structure: Defines the structure of the request made by the application.
  • Response Structure: Defines the structure of response returned by the web service.
  • Endpoint: Defines where the services are available.





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