what is web service

Web service is a platform-independent, low-coupling, self-contained, programmable web-based application that can be described using the open XML (a subset of the Standard Generalized Markup Language) standard , publish, discover, coordinate and configure these applications for developing distributed interoperable applications.

Web Service technology enables different applications running on different machines to exchange data with each other without the need for additional, specialized third-party software or hardware. or integrated.

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Between applications implemented according to the Web Service specification, regardless of the language, platform or internal protocol they use, can exchange data with each other. Web Service is a self-describing, self-contained available network module that can perform specific business functions. Web Services are also easy to deploy because they are based on some conventional industry standards and existing technologies, such as subsets of XML and HTTP under the standard universal markup language. Web Services reduce the cost of application interfaces. Web Service provides a common mechanism for the integration of business processes across an entire enterprise or even between multiple organizations.

History

##Technology widely used in the web:

TCP/IP: Universal network protocol, used by various devices Using

HTML (an application under the Standard Universal Markup Language): a common user interface that can use HTML tags to display data

.NET: Sharing data and data exchange between different applications

Java: Write a universal programming language that can run on any system once, because java has cross-platform features

XML (a subset of the Standard Universal Markup Language): Universal data expression language, uploaded on the web An easy way to send structured data

They are characterized by their openness and cross-platform nature. Openness is the basis of Web services.

In recent years, the rapid development of the Internet has made it a huge resource library for global information transmission and sharing. More and more Web application systems are being established in the network environment. Using Web technologies such as HTML and CGI, various applications such as e-commerce and e-government can be easily implemented in the Internet environment. However, these applications may be distributed in different geographical locations, using different data organization forms and operating system platforms. In addition, data inconsistency caused by different applications makes how to centralize and make full use of these highly distributed data an urgent solution. The problem.

With the development of network technology and network operation concepts, people have proposed a new solution for application integration using the network - Web Service. Web Service is a new branch of Web applications that can perform any function from simple requests to complex business processing. Once deployed, other Web Service applications can discover and call the service it deploys. Therefore, Web Service is the latest technology and development trend for constructing distributed, modular applications and service-oriented application integration.

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