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Viewing a WSDL File and Testing a Web Service

Xem một tập tin WSDL và thử nghiệm một dịch vụ web WSDL là viết tắt của Web Ngôn ngữ mô tả dịch vụ, và một tập tin WSDL chứa một mô tả đầy đủ các dịch vụ Web của bạn, bao gồm các thông tin cần thiết để gọi các phương pháp của dịch vụ. Một tập tin WSDL được viết bằng XML và quy định cụ thể các thông tin sau | Viewing a WSDL File and Testing a Web Service WSDL stands for Web Services Description Language and a WSDL file contains a complete description of your Web service including the information required to call your service s methods. A WSDL file is written in XML and specifies the following information Web service methods Data types used by the methods Request and response message formats for communication with the methods Note For comprehensive information on WSDL visit www.w3.org TR wsdl. You access your Web service by pointing your browser to the following URL http localhost NorthwindWebS ervice Customers.asmx As you can see from Figure 17.3 the resulting page displayed in your browser contains two links named Service Description and Retrieve Customers. Figure 17.3 Accessing a Web service Note You can also access your Web service by right-clicking on the Customers.asmx file in the Solution Explorer window in VS .NET and selecting Set As Start Page from the pop-up menu. You then select Debug Start Without Debugging to test your service. VS .NET will start Internet Explorer and display the same test page as was shown in Figure 17.3. Viewing the WSDL File for the Web Service If you click the Service Description link you ll see the description of your Web service in the form of a WSDL file which is shown in Listing 17.3. Notice that this WSDL file is written in XML and contains the details on how to call the methods exposed by the example Web service. The WSDL file also contains the data types of the parameters used and the calls you can make to your methods. Listing 17.3 WEB SERVICE WSDL FILE_ xml version 1.0 encoding utf-8 - definitions xmlns http http schemas .xmlsoap.org wsdl http xmlns soap http schemas.xmlsoap.org wsdl soap xmlns s http www.w3.org 2001 XMLSchema xmlns s0 http DbProgramming NorthwindWebService xmlns soapenc http schemas.xmlsoap.org soap encoding xmlns tm http microsoft.com wsdl mime textMatching xmlns mime http .