Java语言程序设计与数据结构 基础篇原书第11版PPT及其他教辅资源41slide.ppt

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1、1Chapter41WebServices2ObjectivesTodescribewhataWebserviceis(§41.1).TocreateaWebserviceclass(§41.2).TopublishandtestaWebservice(§41.3).TocreateaWebserviceclientreference(§41.4).ToexplaintheroleofWSDL(§41.4).TopassobjecttypeofargumentsinaWebservice(§41.5).Todiscoverhowaclientc

2、ommunicateswithaWebservice(§41.5).TodescribewhatareSOAPrequestandSOAPresponse(§41.5).TotrackasessioninWebservices(§41.6).3WhatisaWebService?WebserviceisatechnologythatenablesprogramstocommunicatethroughHTTPontheInternet.Webservicesenableaprogramononesystemtoinvokeamethodinan

3、objectonanothersystem.YoucandevelopanduseWebservicesusinganylanguagesonanyplatform.Webservicesaresimpleandeasytodevelop.4WhatisSOAP?WebservicesrunontheWebusingHTTP.ThereareseveralAPIsforWebservices.ApopularstandardistheSimpleObjectAccessProtocol(SOAP),whichisbasedonXML.Theco

4、mputeronwhichaWebserviceresidesisreferredtoasaserver.Theserverneedstomaketheserviceavailabletotheclient,knownaspublishingaWebservice.UsingaWebservicefromaclientisknownasconsumingaWebservice.5HowdoesaclientcommunicatewithaWebserviceAclientinteractswithaWebservicethroughaproxy

5、object.TheproxyobjectfacilitatesthecommunicationbetweentheclientandtheWebservice.Theclientpassesargumentstoinvokemethodsontheproxyobject.Theproxyobjectsendstherequesttotheserverandreceivestheresultbackfromtheserver,asshowninFigure41.1.6CreatingWebServicesUsingNetBeansCreatea

6、Webproject,CreateaWebservice,deployWebservice7TestingWebServices8TestingWebServices9ConsumingWebServicesCreatingaWebserviceclient10WhatisWSDL?WhenyoucreatedaWebservicereference,youenteredaWSDLURL,asshowninFigure41.6.A.wsdlfileiscreatedunderthexm-resourcesfolder,asshowninFigu

7、re41.8.SowhatisWSDL?WSDLstandsforWebServiceDescriptionLanguage.A.wsdlfileisanXMLfilethatdescribestheavailableWebservicetotheclient,i.e.,theremotemethods,theirparameters,andreturnvaluetypes,etc.11PassingandReturningArguments12XMLserialization/deserializationCanyoupassanargume

8、ntofanytypebetweenaclientandaWebservice?No.SOAPonlysupportsprimitivetypes,w