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手把手教你實(shí)現(xiàn)WCF上傳文件

開(kāi)發(fā) 后端
文章主要實(shí)現(xiàn)WCF上傳文件,有詳細(xì)的步驟和代碼介紹,喜歡研究WCF的朋友一定要仔細(xì)閱讀,希望對(duì)大家有技術(shù)上的提高。

在優(yōu)酷上我想上傳一段視頻,你有想過(guò)會(huì)臺(tái)是怎么實(shí)現(xiàn)的嗎?這里我就為大家分析一下關(guān)于利用WCF上傳文件,在WCF沒(méi)出現(xiàn)之前,我一直使用用WebService來(lái)上傳文件,我不知道別人為什么要這么做,因?yàn)槲覀兊奈募?wù)器和網(wǎng)站后臺(tái)和網(wǎng)站前臺(tái)都不在同一個(gè)機(jī)器,操作人員覺(jué)得用FTP傳文件太麻煩,我就做一個(gè)專門用來(lái)上傳文件的WebService,把這個(gè)WebService部署在文件服務(wù)器上,然后在網(wǎng)站后臺(tái)調(diào)用這個(gè)WebService,把網(wǎng)站后臺(tái)頁(yè)面上傳上來(lái)的文件轉(zhuǎn)化為字節(jié)流傳給WebService,然后WebService把這個(gè)字節(jié)流保存文件到一個(gè)只允許靜態(tài)頁(yè)面的網(wǎng)站(靜態(tài)網(wǎng)站可以防止一些腳本木馬)。

#T#WebService來(lái)上傳文件存在的問(wèn)題是效率不高,而且不能傳輸大數(shù)據(jù)量的文件,當(dāng)然你可以用Wse中的MTOM來(lái)傳輸大文件,有了WCF就好多了,通過(guò)使用WCF傳遞Stream對(duì)象來(lái)傳遞大數(shù)據(jù)文件,但有一些限制:只有BasicHttpBinding、NetTcpBinding和NetNamedPipeBinding支持傳送流數(shù)據(jù)。流數(shù)據(jù)類型必須是可序列化的Stream或MemoryStream。傳遞時(shí)消息體(MessageBody)中不能包含其他數(shù)據(jù)。TransferMode的限制和MaxReceivedMessageSize的限制等。

下面具體實(shí)現(xiàn):新建一個(gè)WCFService,接口文件的代碼如下:

  1. [ServiceContract]  
  2. publicinterfaceIUpLoadService  
  3. {  
  4. [OperationContract(Action="UploadFile",IsOneWay=true)]  
  5. voidUploadFile(FileUploadMessagerequest);  
  6. }  
  7. [MessageContract]  
  8. publicclassFileUploadMessage  
  9. {  
  10. [MessageHeader(MustUnderstand=true)]  
  11. publicstringSavePath;  
  12. [MessageHeader(MustUnderstand=true)]  
  13. publicstringFileName;  
  14. [MessageBodyMember(Order=1)]  
  15. publicStreamFileData;  

定義FileUploadMessage類的目的是因?yàn)榈谌齻€(gè)限制,要不然文件名和存放路徑就沒(méi)辦法傳遞給WCF了,根據(jù)第二個(gè)限制,文件數(shù)據(jù)是用System.IO.Stream來(lái)傳遞的接口方法只有一個(gè),就是WCF上傳文件,注意方法參數(shù)是FileUploadMessage接口實(shí)現(xiàn)類文件的代碼如下:

  1. publicclassUpLoadService:IUpLoadService  
  2. {  
  3. publicvoidUploadFile(FileUploadMessagerequest)  
  4. {  
  5. stringuploadFolder=@"C:\kkk\";  
  6. stringsavaPath=request.SavePath;  
  7. stringdateString=DateTime.Now.ToShortDateString()+@"\";  
  8. stringfileName=request.FileName;  
  9. StreamsourceStream=request.FileData;  
  10. FileStreamtargetStream=null;  
  11. if(!sourceStream.CanRead)  
  12. {  
  13. thrownewException("數(shù)據(jù)流不可讀!");  
  14. }  
  15. if(savaPath==null)savaPath=@"Photo\";  
  16. if(!savaPath.EndsWith("\\"))savaPath+="\\";  
  17.  
  18. uploadFolderuploadFolder=uploadFolder+savaPath+dateString;  
  19. if(!Directory.Exists(uploadFolder))  
  20. {  
  21. Directory.CreateDirectory(uploadFolder);  
  22. }  
  23. stringfilePath=Path.Combine(uploadFolder,fileName);  
  24. using(targetStream=newFileStream(filePath,FileMode.Create,FileAccess.Write,FileShare.None))  
  25. {  
  26. //readfromtheinputstreamin4Kchunks  
  27. //andsavetooutputstream  
  28. constintbufferLen=4096;  
  29. byte[]buffer=newbyte[bufferLen];  
  30. intcount=0;  
  31. while((count=sourceStream.Read(buffer,0,bufferLen))>0)  
  32. {  
  33. targetStream.Write(buffer,0,count);  
  34. }  
  35. targetStream.Close();  
  36. sourceStream.Close();  
  37. }  
  38. }  
  39. }  

實(shí)現(xiàn)的功能是到指定目錄下按照日期進(jìn)行目錄劃分,然后以傳過(guò)來(lái)的文件名保存文件。這篇文章最主要的地方就是下面的Web.Config配置:

  1. <system.serviceModel> 
  2. <bindings> 
  3. <basicHttpBinding> 
  4. <bindingnamebindingname="FileTransferServicesBinding"maxReceivedMessageSize="9223372036854775807"  
  5. messageEncoding="Mtom"transferMode="Streamed"sendTimeout="00:10:00"/> 
  6. </basicHttpBinding> 
  7. </bindings> 
  8. <services> 
  9. <servicebehaviorConfigurationservicebehaviorConfiguration="UploadWcfService.UpLoadServiceBehavior" 
  10. name="UploadWcfService.UpLoadService"> 
  11. <endpointaddressendpointaddress=""binding="basicHttpBinding"bindingConfiguration="FileTransferServicesBinding"contract="UploadWcfService.IUpLoadService"> 
  12. </endpoint> 
  13. <endpointaddressendpointaddress="mex"binding="mexHttpBinding"contract="IMetadataExchange"/> 
  14. </service> 
  15. </services> 
  16. <behaviors> 
  17. <serviceBehaviors> 
  18. <behaviornamebehaviorname="UploadWcfService.UpLoadServiceBehavior"> 
  19. <serviceMetadatahttpGetEnabledserviceMetadatahttpGetEnabled="true"/> 
  20. <serviceDebugincludeExceptionDetailInFaultsserviceDebugincludeExceptionDetailInFaults="false"/> 
  21. </behavior> 
  22. </serviceBehaviors> 
  23. </behaviors> 
  24. </system.serviceModel> 
責(zé)任編輯:田樹(shù) 來(lái)源: 博客
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