Android HttpClient上传文件错误处理

Question

我有一个图片上传器。如果互联网连接停止，则会显示一个警告对话框并询问用户是否要重试或取消上传。问题是有时当我重试时，在第二次上传后上传了两张图片而不是一张。可能是什么问题？

这是我的代码：

@Override
        protected Void doInBackground(Void... params) {
            Log.i("ImageUpload", "Uploading..");

            setBitmap();

            HttpClient httpClient = new DefaultHttpClient();

            HttpPost httpPostRequest = new HttpPost(url);

            httpPostRequest.setHeader("Cookie", this.cookie);

            MultipartEntityBuilder multiPartEntityBuilder = MultipartEntityBuilder
                    .create();

            ByteArrayOutputStream stream = new ByteArrayOutputStream();

            this.image.compress(Bitmap.CompressFormat.PNG, 100, stream);

            byte[] byteArray = stream.toByteArray();

            multiPartEntityBuilder.addBinaryBody("picture", byteArray,
                    ContentType.create("image/png"), "image.png");
            httpPostRequest.setEntity(multiPartEntityBuilder.build());

            try {
                HttpResponse httpResponse = null;

                Log.i("ImageUpload", "====================================================\n"
                        + "httpClient.execute(httpPostRequest)");

                httpResponse = httpClient.execute(httpPostRequest);
                Log.i("ImageUpload", "====================================================");
                Log.i("ImageUpload", "httpPost executed");

                InputStream inputStream = null;
                inputStream = httpResponse.getEntity().getContent();

                String result;
                if (inputStream != null) {
                    result = convertInputStreamToString(inputStream);
                } else {
                    result = "Unable to send signiture.";
                }

                Log.i("Upload result", result);
            } catch (IOException e) {
                photoSent = false;
                httpPostRequest.abort();
                this.cancel(true);
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onCancelled() {
            this.mainActivity.hideProgressBar();

            AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(
                    mainActivity);
            myAlertDialog
                    .setTitle("Error why uploading the picture.");

            myAlertDialog.setNegativeButton("Cancel",
                    new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            return;
                        }
                    });

            myAlertDialog.setPositiveButton("Retry",
                    new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            /*execute the whole AsyncTask again*/
                        }
                    });

            myAlertDialog.show();

            super.onCancelled();
        }

Answer 1

试试这样：

InputStream inputStream;
inputStream = new FileInputStream(new File(photoFile));
byte[] data;
data = IOUtils.toByteArray(inputStream);

httpClient.getParams().setParameter(CoreProtocolPNames.USER_AGENT,
System.getProperty("http.agent"));

InputStreamBody inputStreamBody = new InputStreamBody(new ByteArrayInputStream(data), "Pic.jpg");

MultipartEntityBuilder multipartEntity = MultipartEntityBuilder.create();
multipartEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
multipartEntity.addPart("PhotoMessage", inputStreamBody);

httpPost.setEntity(multipartEntity.build());

HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();

Answer 2

我发现了问题。我认为问题在于发送图片后但在请求结束之前连接丢失。