如何使用MediaHttpUploader将图像上传到BlobStore？

Question

我在android中使用以下函数，但在拨打uploader.upload()时出现错误“500 Java Heap Space”。

如果我叫uploader.setDirectUploadEnabled(true)uploader.upload()之前，我得到错误“411长度要求”对upload()而不是错误500

public static String uploadImage(Context context, String file, MediaHttpUploaderProgressListener progressListener) 
      throws Exception { 
// The file is something like : /mnt/sdcard/wallpapers/image.jpg 
     File mediaFile = new File(file); 
     HttpTransport transport = new NetHttpTransport();  

     HttpRequestFactory factory = transport.createRequestFactory(null); 
//obtain the upload url 
     GenericUrl getUploadUrl = new GenericUrl(Util.getBaseUrl(context) 
       + "/myapp/blobservice?get-key"); 
     HttpRequest request = factory.buildGetRequest(getUploadUrl); 
     HttpResponse response1 = request.execute(); 

     String postUrl = convertStreamToString(response1.getContent()).trim(); 
// the returned post url when using the development server is something like : //http://192.168.1.4:8888/_ah/upload/agd5YWRnZXQychwLEhVfX0Jsb2JVcGxvYWRTZXNzaW9uX18Y2wUM 

     InputStreamContent mediaContent = new InputStreamContent("image/jpeg", 
       new BufferedInputStream(new FileInputStream(mediaFile))); 
     mediaContent.setLength(mediaFile.length()); 
     MediaHttpUploader uploader = new MediaHttpUploader(mediaContent,transport, null); 

     uploader.setProgressListener(progressListener); 

//the following line produces exception "500 Java heap space" on the local server 
//on the remote server I get "500: Internal server error" 

     HttpResponse response = uploader.upload(new GenericUrl(postUrl)); 
     if (!response.isSuccessStatusCode()) { 
      throw new Exception("Uploading image failed."); 
     } else { 
      String blobKey = convertStreamToString(response.getContent()).trim(); 
      return blobKey; 
     } 
    } 

Answer 1

似乎MediaHttpUpload使用resumable protocol，这是不符合multipart/form-data file upload of GAE blobstore兼容。

您应该创建一个custom data upload servlet，它知道如何处理resumable protocol。