2016-03-08 66 views
1

在我的應用程序中,我有一個字符串,它是一個文件內容。我需要用blobstore中的這個內容創建新文件。我tryed使用文件API這樣的:在GAE blobstore中創建文件java

FileService fileService = FileServiceFactory.getFileService(); 
    AppEngineFile file = fileService.createNewBlobFile("text/plain"); 
    FileWriteChannel writeChannel = fileService.openWriteChannel(file, true); 

    writeChannel.write(ByteBuffer.wrap(content.getBytes())); 
    writeChannel.closeFinally(); 
    BlobKey blobKey = fileService.getBlobKey(file); 
    res.sendRedirect("/serve?blob-key=" + blobKey); 

但由於文件API已被棄用,我只得到這個錯誤:

HTTP ERROR 500 

Problem accessing /create_timetable. Reason: 

The Files API is disabled. Further information: https://cloud.google.com/appengine/docs/deprecations/files_api 
Caused by: 

com.google.apphosting.api.ApiProxy$FeatureNotEnabledException: The Files API is disabled. Further information: https://cloud.google.com/appengine/docs/deprecations/files_api 
at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.callInternal(ApiProxyLocalImpl.java:515) 
at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.call(ApiProxyLocalImpl.java:484) 
at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.call(ApiProxyLocalImpl.java:461) 
at java.util.concurrent.Executors$PrivilegedCallable$1.run(Executors.java:533) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.util.concurrent.Executors$PrivilegedCallable.call(Executors.java:530) 
at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at java.lang.Thread.run(Thread.java:745) 

我如何可以手動創建Blob存儲文件,因爲用戶只給我數據內容字符串,而不是文件本身,所以我不能使用<form action="blobstoreService.createUploadUrl("/upload") %>"<input type="file">

更新

@ozarov建議我使用Google Cloude Storage API來完成它,並編寫了下面的函數。它還會返回此文件的BlobKey,以便您可以使用Blobstore API訪問它。

private BlobKey saveFile(String gcsBucket, String fileName, 
     String content) throws IOException { 
    GcsFilename gcsFileName = new GcsFilename(gcsBucket, fileName); 
    GcsOutputChannel outputChannel = 
      gcsService.createOrReplace(gcsFileName, GcsFileOptions.getDefaultInstance()); 
    outputChannel.write(ByteBuffer.wrap(content.getBytes())); 
    outputChannel.close(); 

    return blobstoreService.createGsBlobKey(
      "/gs/" + gcsFileName.getBucketName() + "/" + gcsFileName.getObjectName()); 
} 

回答

2

您應該寫信給Google Cloud Storage。 文件API是deprecated,並且您是正確的,Blobstore API 不提供直接寫入它的編程方式。

稍後,您可以使用自己的API直接從Google雲端存儲讀取數據,也可以使用Blobstore API爲其編寫creating的BlobKey數據。