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Android Web servicewww.mobilepro.vn Professional ProgrammingNi dungGii thiu v WebserviceSOAPWSDLHng dn cch to 1 webservice n ginTm hiu v th vin KSOAP2Demo Android Webservice client

Gii thiu WSWeb Serivce l mt cng ngh cho php client truy xut thc hin mi tc v nh mt Web Application.V bn cht, Web service da trn XML v HTTP, trong XML lm nhim v m ha v gii m d liu v dng SOAP truyn tiWeb Service khng ph thuc vo platform no, do bn c th dng Web Service truyn ti d liu gia cc ng dng hay gia cc platform.

Mt v d v Web Service sn c l dch v c cung cp bi PayPal cho php nhng ngi c ti khon c th thanh ton hoc tr mt phn hoc thc hin cc giao dch tm kim, v ly li cc thng tin ca tng giao dch c thS tng tc gia User v Web Service:

WS-Inspection document support in the Web Services Toolkit

SOAPSOAP Simple Object Access ProtocolMt tiu chun ca W3C, l giao thc s dng XML nh ngha d liu dng thun vn bn (plain text) thng qua HTTP. SOAP l cch m Web Service s dng truyn ti d liu. V da trn XML nn SOAP l mt giao thc khng ph thuc platform cng nh bt k ngn ng lp trnh no.Mt thng ip SOAP c chia thnh hai phn l header v body. Phn header ch ra a ch Web Service, host, Content-Type, Content-Length tng t nh mt thng ip HTTP.SOAP ExampleKhi to mt d n Web Service, mc nh Web Visual Develop s to cho bn phng thc HelloWorld() sau:

POST /MathService.asmx/HelloWorld HTTP/1.1 Host: localhost Content-Type: application/x-www-form-urlencoded Content-Length: lengthMt HTTP Request s c dng saui vi SOAP 1.2REQUESTRESPONSE

WSDLWSDL Web Services Description LanguageWSDL l ngn ng c s dng m t y v Web Service theo chun XML nh cc phng thc, kiu d liu, da trn XML schema.

XML SchemaXML Schema l dng ti liu theo chun XML c xut bi t chc W3C nm 2001XML Schema c dng m t cu trc v cc kiu d liu ca mt ti liu XML thay th cho chun DTD (Document Type Definition) trc yVic ny gip nh ngha mt ti liu XML hp l cng nh cc metadata cn thit s dng trong nhiu loi ng dng v cng ngh hin nay nh XAML, ADO.NET, WebService,

WSDLV d mt on nh ngha kiu d liu ca WSDL cho phng thc HelloWorld() trn:

WSDLTrong , phn nh ngha cc kiu d liu dng cho request c t tn da theo tn phng thc HelloWorld:

Theo sau l phn nh ngha cc kiu d liu dng response c t tn HelloWorldResponse:

KSOAP2L b th vin gip xy dng cc webservice client trn Android.Tm hiu & Download th vin ny ti : http://code.google.com/p/ksoap2-android/