上传到谷歌云存储中的Android

问题描述：

使用Blob存储区API与HttpURLConnection的我有一个端点API方法，让我上传的网址，以谷歌云存储这样的：上传到谷歌云存储中的Android

@ApiMethod(name = "getUploadUrl", path = "get_upload_url", httpMethod = ApiMethod.HttpMethod.POST) 
    public CollectionResponse<String> getUploadUrl(@Named("objectName")String objectName){ 

     BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService(); 
     String callbackUrl = "/handleupload"; 
     String uploadUrl = blobstoreService.createUploadUrl(callbackUrl, 
       UploadOptions.Builder.withGoogleStorageBucketName("my-bucket")); 

     ArrayList<String> results = new ArrayList<>(1); 
     results.add(uploadUrl); 
     return CollectionResponse.<String>builder().setItems(results).build(); 
    }

这成功返回一个网址给我要上传我的图像文件。

在Android中，我尝试将文件上传这样的：

private Boolean uploadImage(File file, String uploadUrl){ 
     try { 
      long bytes = file.length(); 

      URL url = new URL(uploadUrl); 
      HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection(); 
      urlConnection.setRequestMethod("POST"); 
      urlConnection.setDoInput(true); 
      urlConnection.setDoOutput(true); 
      urlConnection.setRequestProperty("Connection", "Keep-Alive"); 
      urlConnection.setRequestProperty("Content-Type", "image/jpg"); 

      DataOutputStream outputStream = new DataOutputStream(urlConnection.getOutputStream()); 

      int bytesAvailable = 0; 
      FileInputStream fileInputStream = null; 
      try { 
       fileInputStream = new FileInputStream(file); 
       bytesAvailable = fileInputStream.available(); 
      } catch (FileNotFoundException e) { 
       e.printStackTrace(); 
       return false; 
      } 

      int maxBufferSize = 1024; 
      int bufferSize = Math.min(bytesAvailable, maxBufferSize); 
      byte[ ] buffer = new byte[bufferSize]; 

      int bytesRead = fileInputStream.read(buffer, 0, bufferSize); 

      while (bytesRead > 0) 
      { 
       outputStream.write(buffer, 0, bufferSize); 
       bytesAvailable = fileInputStream.available(); 
       bufferSize = Math.min(bytesAvailable,maxBufferSize); 
       bytesRead = fileInputStream.read(buffer, 0,bufferSize); 
      } 
      int responseCode = urlConnection.getResponseCode(); 

      fileInputStream.close(); 
      outputStream.flush(); 
      outputStream.close(); 

     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     return false; 
    }

但我回来的400 Bad Request响应。我认为我做错了什么。

我想用HttpURLConnection类，因为Android的推荐过来HttpClient（这是最让帖子有例子）：http://android-developers.blogspot.com/2011/09/androids-http-clients.html

，我使用Blob存储区API来上传图片，而不是谷歌的Cloud Storage签名的URL，因为我可以通过回调服务器端来处理上传。

答

我从来没有尝试过自己，所以我不是100％确定。然而，公共documentation确实表明请求必须“包含文件上传字段，并且表单的enctype必须设置为multipart/form-data。” 有各种示例显示如何使用HttppUrlConnection发送此类请求。（这是一个example，但请确保您使用“文件”而不是“文件名”）。

上传到谷歌云存储中的Android

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