java - 从 Android 上传 Google App Engine Java Blobstore 无响应

Question

我正在尝试从 Android 将图像上传到 blobstore，但是当我的服务器 servlet 在完成时被调用时，Blobstore 无法传递任何 BlobKey。当我检查实际的 blobstore 时，没有上传任何图像。没有错误代码，没有警告，没有错误，什么都没有。现在我知道服务器的东西是有效的，因为上传在 iOS 中有效。 Android 代码在本地开发服务器上运行良好，但在生产环境中却无法运行。我希望也许有人可以发现我的代码中的错误。

提前致谢。

HttpURLConnection connection = null;

    try {

        Log.d(LOG_TAG, "Starting multipart POST request to: " +fullUrlValue);

        URL fullUrl = new URL(fullUrlValue);

        //make server call
        connection = getClient().getConnection(fullUrl, RequestMethod.POST);
        connection.setConnectTimeout(60000); //60 seconds to complete an upload 
        connection.setUseCaches(false);
        connection.setDoInput(true);
        connection.setDoOutput(true);

        //see if we are streaming the upload
        if(requestOptions == null || requestOptions.isChunckedStreamingMode())
        {
            connection.setChunkedStreamingMode(2048);
        }

        String boundry = "z6fQbdm2TTgLwPQj9u1HjAM25z9AJuGSx7WG9dnD";

        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Cache-Control", "no-cache");
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundry);

        //attach post objects
        DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());

        //add form fields
        if(additionalParameters != null && additionalParameters.keySet().size() > 0)
        {
            Iterator<String> it = additionalParameters.keySet().iterator();
            while(it.hasNext())
            {
                String fieldName = it.next();
                if(fieldName != null)
                {
                    String value = additionalParameters.get(fieldName);
                    if(value != null)
                    {
                        //add form field to upload form
                        outputStream.writeBytes("--" + boundry + "\r\n" + "Content-Disposition: form-data; name=\"" + fieldName + "\"\r\nContent-Type: text/plain; charset=UTF-8\r\n\r\n"+value+"\r\n");
                    }
                }
            }
        }

        //attach file
        if(postObjectBytes != null)
        {   
            //build the request body
            outputStream.writeBytes("--" + boundry + "\r\n" + "Content-Disposition: form-data; name=\"" + formElementName + "\";filename=\"" + fileName + "\"\r\n\r\n");


            //object upload content size
            long totalUploadSize = postObjectBytes.length;

            //we have to manually process the stream in order to correctly update the progress listener
            byte[] buffer = new byte[2048];
            long totalBytes = 0;
            int bytesRead = 0;

            InputStream inputStream = new ByteArrayInputStream(postObjectBytes);

            while ((bytesRead = inputStream.read(buffer)) > -1) {
                totalBytes += bytesRead;
                outputStream.write(buffer, 0, bytesRead);

                if(progressListener != null){
                    progressListener.transferred(totalBytes, totalUploadSize);
                }
            }

            outputStream.writeBytes("\r\n--" + boundry + "--\r\n");

        }

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

Answer 1

好吧，感谢AppEngine BlobStore upload failing with a request that works in the Development Environment，我找到了答案.

显然我在分号和“文件名”的开头之间缺少一个空格。那太疯狂了。

formElementName + "\";filename