Question

当我使用Android将视频上传到服务器（Vimeo）时，一切正常。

但是在上传期间，如果我失去网络连接，则无法触发DataOutputStream的.write I / O异常。所以我的应用程序冻结了。

如何触发异常以恢复或重置我的上传？

我的try / catch不会触发异常…

这是我的代码：

private void call_for_ticket(String upload_url, String complet_uri, String videoUri) {

    HttpURLConnection conn = null;
    DataOutputStream dos = null;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1 * 1024 * 1024;
    File sourceFile = new File(videoUri);

    if (sourceFile.isFile())
    {

        try
        {

            // open a URL connection to the Servlet
            FileInputStream fileInputStream = new FileInputStream(
                    sourceFile);
            URL url = new URL(upload_url);

            // Open a HTTP connection to the URL
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true); // Allow Inputs
            conn.setDoOutput(true); // Allow Outputs
            conn.setUseCaches(false); // Don't use a Cached Copy
            conn.setRequestMethod("PUT");

            conn.setRequestProperty("Authorization",Aurtorizartion);
            conn.setRequestProperty("Accept",accept);

            conn.setRequestProperty("Connection", "Keep-Alive");



            conn.setRequestProperty("Content-Type", "video/mp4");

            conn.setChunkedStreamingMode(-1);

            try {
                dos = new DataOutputStream(conn.getOutputStream());

                // create a buffer of maximum size
                bytesAvailable = fileInputStream.available();

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

                // read file and write it into form...
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);

                long bytesAvailableReadIncrementation = 0;
                long totalFileSize = bytesAvailable;


                try{
                while (bytesRead > 0) {

                    dos.write(buffer, 0, bufferSize);

                    bytesAvailable = fileInputStream.available();

                    bufferSize = Math
                            .min(bytesAvailable, maxBufferSize);
                    bytesRead = fileInputStream.read(buffer, 0,
                            bufferSize);

                    bytesAvailableReadIncrementation += bytesRead;

                    publishProgress("" + (long) ((bytesAvailableReadIncrementation * 100) / totalFileSize));


                }
                } catch (IOException e) {
                    Log.d("VMA", "lost connection");
                    e.printStackTrace();

                }
                // send multipart form data necesssary after file
                // data...
                dos.writeBytes(lineEnd);
                dos.writeBytes(twoHyphens + boundary + twoHyphens
                        + lineEnd);

                int serverResponseCode;

                // Responses from the server (code and message)
                serverResponseCode = conn.getResponseCode();
                String serverResponseMessage = conn
                        .getResponseMessage();

                // close the streams //
                fileInputStream.close();
                dos.flush();
                dos.close();

                if (serverResponseCode == 200) {
                    call_complete_uri(complet_uri);
                }
            }
            catch (IOException e)
            {
                Log.d("VMA", "lost connection");
                e.printStackTrace();
            }

        } catch (IOException e) {
            Log.d("VMA", "lost connection");
            e.printStackTrace();

        }

    }

}

Answer 1

好吧，我知道了。

我正在模拟器上测试代码。在实际设备上，会引发异常：）。

HttpURLConnection上载文件触发网络丢失以进行重置或恢复

1 个答案: