TAILIEUCHUNG - What Is a Web Service?

một dịch vụ Web là gì? Một dịch vụ Web là một thành phần doanh nghiệp cung cấp một số cơ sở hữu ích cho khách hàng, hoặc người tiêu dùng. Cũng như Distributed Component Object Model (DCOM) được coi là "COM với một dây dài hơn," | What Is a Web Service A Web service is a business component that provides some useful facility to clients or consumers. Just as Distributed Component Object Model DCOM is thought of as COM with a longer wire a Web service can be thought of as a component with a truly global reach. Web services use a standard accepted and well-understood protocol called HTTP to transmit data and a portable data format that is based on XML. HTTP and XML are both standardized technologies that can be used by other programming environments outside of the .NET Framework. So you can build Web services by using Visual Studio 2005 and client applications called consumers that are running in a totally different environment such as Java can use them. The reverse is also true you can build Web services by using Java and write consumer applications in C . You can use several different languages with Visual Studio 2005 to build Web services. Currently Microsoft Visual C Microsoft Visual C Microsoft Visual J and Microsoft Visual Basic .NET are supported and it is likely that there will be others in the future. As far as the consumer is concerned however the language used by the Web service and even how the Web service performs its tasks is not important. The consumer s view of a Web service is of an interface that exposes a number of well-defined methods. All the consumer needs to do is call these methods by using the standard Internet protocols passing parameters in an XML format and receiving responses also in an XML format. One of the driving forces behind the .NET Framework and future releases of Windows is the concept of the programmable Web. The idea is that in the future systems will be constructed by using the data and services provided by multiple Web services. Web services provide the basic elements for systems the Web provides the means to gain access to them and developers glue them together in meaningful ways. Web services are a key integration technology for combining disparate .

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