计算机科学与技术：VB.NET应用教程 978-7-302-09622-1 Advanced VB.NET Chapter 16

《计算机科学与技术：VB.NET应用教程 978-7-302-09622-1 Advanced VB.NET Chapter 16》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Chapter16WebServicesObjectivesUnderstandWebservicesframeworkUnderstandthecomponentsofWebservices–ExtensibleMarkupLanguage(XML)TheXMLSchemaDefinition(XSD)SimpleObjectAccessProtocol(SOAP)WebServicesDescriptionLanguage(WSDL)UniversalDescription,DiscoveryandIntegration(UDDI)standardLearnhowtocreateWebSe

2、rvicesUnderstandhowtheseservicesareconsumedbyaclientthroughtheuseofProxyclassesLab16.1TheE-MailWebServiceLab16.2UnisysWeatherWebServiceSuggestedHomeAssignments2Copyright2004PearsonEducation,Inc.IntroductionWebServicesareproceduresthatareexposedbyremoteservers.Theseprocedurescanbeconsumedbyanyauthori

3、zedclientbysupplyingappropriateinputparametersTheWebserviceclassesbelongtotheSystem.Web.ServicesnamespaceWebservicescanreturnarangeofoutputs–fromasimplesinglevaluetoacomplexdatasetorclassWebservicesusestandardprotocolssuchasHTTP.Hence,theycangothroughfirewallsWebservicesareplatformindependent.Theyca

4、nbeconsumedbybothWindowsandWebapplications3Copyright2004PearsonEducation,Inc.ObjectivesUnderstandWebservicesframeworkUnderstandthecomponentsofWebservices–ExtensibleMarkupLanguage(XML)TheXMLSchemaDefinition(XSD)SimpleObjectAccessProtocol(SOAP)WebServicesDescriptionLanguage(WSDL)UniversalDescription,D

5、iscoveryandIntegration(UDDI)standardLearnhowtocreateWebServicesUnderstandhowtheseservicesareconsumedbyaclientthroughtheuseofProxyclassesLab16.1TheE-MailWebServiceLab16.2UnisysWeatherWebServiceSuggestedHomeAssignments4Copyright2004PearsonEducation,Inc.WebServiceStandardsHTTP:StandardprotocoloftheWorl

6、dWideWeb.SinceWebservicesuseHTTP,clientsandWebserviceproviderscancommunicatewithoutanyhindranceXMLandXSD:XMLprovidesastandardwayofrepresentingdata.XMLschemastandard(XSD)isatypesystemusedbyWebservices.XSDallowssimpleandcomplexdatatypes.XMLisusedfordatacommunicationsinADO.NET5Copyright2004PearsonEduca

7、tion,Inc.WebServiceStandardsSimpleObjectAccessProtocol(SOAP):ClientssendrequeststoandreceiveresponsesfromaWebserviceusingSOAP.SOAPspecificationsprovidestandardrulesforencodingdataasXMLsothatdatacanbet