| There is not any concept in vogue so much until the Web Service occurred, and it is in attention so much. We can say it is a revolution in software. It is defined as the software module, which is loose coupling, repeatedly used system encapsulating discrete function, and it can be visited on the internet after publishing.Here, we will set a small example web service system, from the understanding of this system; we will learn more about the meaning and potentiality of web service.In this article, we analyse the background, design target, advantage and relative developping technologies of the web service.we discuss the idea and method of web service's designning .on this foundation, we analyse and discuss a comprehensive operation of flight system, combining with the character of web service, we design a web demo system, in which we integrete the web service and SQL database, through the SOAP protocol application, we realize the cross-platform service. Through the usage of XML Web service standard, the application software can cross the platform, programming language and interoperation. As a basic function of Microsoft platform, the developing platform based on the XML Web Service standard will realize the dream that person to person, person to enterprise, enterprise to enterprise can communicate with each other.Using .NET platform, we developed an n layers web application, in the application,We use repeatedly used component, which encapsulate the logics of data and operation.Creating the proxy connecting web service and clientUsing the web service in the applicationUsing the identity checking technology based on the HTML formAbout function, we realize the distributed remote call of time search and real time news and deals, book service etc, in this system; we satisfy the basic idea of programmable web that is programmer can create the whole system through intergration of service. Any system, any data and format will be the tenet of programmable web. As a function of developper, he will not program or buy any component, and only to visit the web service is ok. So, we can publish the system onto the internet.Microsoft?.NET include very wild series of products (enhanced intelligent device, service, server and client tool), all these products were targeted to support xml and merged into internet standard. It is a best way of creating, publishing, managing, using web service to use Microsoft .NET framework, and also a current of future softwaredevelopment.The design target of web serviceWeb service is the application integration software on the different OS, hardware platform and between kinds of programming languages, whose development and use should be dependent on kinds of OS, programming model and language. Besides this, it should make full use of the current web technology, to achieve such target, we must meet the requirement of loose coupling commutation system's message is based on the text and understanding each other, so we can take it as a loose coupling system.It is popular that all the OS and devices will face the net, internet, which will ensure the device on the internet can visit them.Uniform data format: there are many formats about data express and transmission, in order to communicate between different system, we must use the current open standard, give up the methods with much localization, if a system can support this open standard ,it will interoperation with web service, now, we use XML language.Web service has many advantages, which will assure it will be the core distributed compute tool of the next generation. But there still exist many problems and challenging with many unresolved problems. |
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