Java语言程序设计10E LiangPPT习题案例39slide.ppt

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1、1Chapter39WebServices2ObjectivesTodescribewhataWebserviceis(§39.1).TocreateaWebserviceclass(§39.2).TopublishandtestaWebservice(§39.3).TocreateaWebserviceclientreference(§39.4).ToexplaintheroleofWSDL(§39.4).TopassobjecttypeofargumentsinaWebservice(§39

2、.5).TodiscoverhowaclientcommunicateswithaWebservice(§39.5).TodescribewhatareSOAPrequestandSOAPresponse(§39.5).TotrackasessioninWebservices(§39.6).3WhatisaWebService?WebserviceisatechnologythatenablesprogramstocommunicatethroughHTTPontheInternet.Webse

3、rvicesenableaprogramononesystemtoinvokeamethodinanobjectonanothersystem.YoucandevelopanduseWebservicesusinganylanguagesonanyplatform.Webservicesaresimpleandeasytodevelop.4WhatisSOAP?WebservicesrunontheWebusingHTTP.ThereareseveralAPIsforWebservices.Ap

4、opularstandardistheSimpleObjectAccessProtocol(SOAP),whichisbasedonXML.ThecomputeronwhichaWebserviceresidesisreferredtoasaserver.Theserverneedstomaketheserviceavailabletotheclient,knownaspublishingaWebservice.UsingaWebservicefromaclientisknownasconsum

5、ingaWebservice.5HowdoesaclientcommunicatewithaWebserviceAclientinteractswithaWebservicethroughaproxyobject.TheproxyobjectfacilitatesthecommunicationbetweentheclientandtheWebservice.Theclientpassesargumentstoinvokemethodsontheproxyobject.Theproxyobjec

6、tsendstherequesttotheserverandreceivestheresultbackfromtheserver,asshowninFigure39.1.6CreatingWebServicesUsingNetBeansCreateaWebproject,CreateaWebservice,deployWebservice7TestingWebServices8TestingWebServices9ConsumingWebServicesCreatingaWebservicecl

7、ient10WhatisWSDL?WhenyoucreatedaWebservicereference,youenteredaWSDLURL,asshowninFigure39.6.A.wsdlfileiscreatedunderthexm-resourcesfolder,asshowninFigure39.8.SowhatisWSDL?WSDLstandsforWebServiceDescriptionLanguage.A.wsdlfileisanXMLfilethatdescribesthe

8、availableWebservicetotheclient,i.e.,theremotemethods,theirparameters,andreturnvaluetypes,etc.11PassingandReturningArguments12XMLserialization/deserializationCanyoupassanargumentofanytypebetweenaclientandaWebservice?No.SOAPonlysupportsprimitivetypes,w