将图像上载到服务器:停留在FileInputStream

我正在尝试将图像上载到服务器,但不知何故,代码在FileInputStream行停止。不知道为什么,我也不知道如何调试或检查它。这里是我的源代码:

 public class CreateSetcardStep1Activity extends AppCompatActivity {

    @Override
    protected void onCreate(final Bundle savedInstanceState) {


        String filename = appHelper.dateToString(new Date(), "yyyyMMdd-hhmmss");
        destination = new File(Environment.getExternalStorageDirectory(), filename + ".jpg");

        buttonTakePhoto.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destination));
                startActivityForResult(intent, REQUEST_IMAGE);
            }
        });

        buttonSubmitPhoto.setVisibility(View.GONE);
        buttonSubmitPhoto.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                dialog = ProgressDialog.show(CreateSetcardStep1Activity.this, "", "Uploading file...", true);

                new Thread(new Runnable() {
                    public void run() {
                        uploadFile(imagePath);
                    }
                }).start();
            }
        });


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == REQUEST_IMAGE && resultCode == Activity.RESULT_OK) {
            try {
                buttonSubmitPhoto.setVisibility(View.VISIBLE);
                Log.e(LOG, "breakpoint 1");
                setcardPic.setVisibility(View.VISIBLE); Log.e(LOG, "breakpoint 2 destination: "+destination);
                FileInputStream in = new FileInputStream(destination); Log.e(LOG, "breakpoint 3");
                BitmapFactory.Options options = new BitmapFactory.Options(); Log.e(LOG, "breakpoint 4");
                options.inSampleSize = 10; Log.e(LOG, "breakpoint 5");
                imagePath = destination.getAbsolutePath(); Log.e(LOG, "breakpoint 6 imagePath: "+imagePath);
                Log.e(LOG, "PATH === " + imagePath);
                //tvPath.setText(imagePath);
                Bitmap bmp = BitmapFactory.decodeStream(in, null, options);
                setcardPic.setImageBitmap(bmp);
                showUploadButton = true;
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        } else {
            showUploadButton = false;
            Toast.makeText(getApplicationContext(),
                    R.string.request_cancelled,
                    Toast.LENGTH_LONG).show();
        }
    }

    public int uploadFile(String sourceFileUri) {

        String fileName = sourceFileUri;
        showUploadButton = false; //revert upload button to hidden
        HttpURLConnection conn = null;
        DataOutputStream dos = null;
        String lineEnd = "\r\n";
        String twoHyphens = "--";
        String boundary = "*****";
        int bytesRead, bytesAvailable, bufferSize;
        byte[] buffer;
        int maxBufferSize = 1024 * 1024;
        File sourceFile = new File(sourceFileUri);

        if (!sourceFile.isFile()) {
            dialog.dismiss();
            Log.e(LOG, "Source File not exist :" +imagePath);
            return 0;
        }
        else
        {
            try {

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

                // 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("POST");
                conn.setRequestProperty("Connection", "Keep-Alive");
                conn.setRequestProperty("ENCTYPE", "multipart/form-data");
                conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
                conn.setRequestProperty("Filedata", fileName);

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

                dos.writeBytes(twoHyphens + boundary + lineEnd);
                dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename="+ fileName + "" + lineEnd);
                dos.writeBytes(lineEnd);

                // 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);

                while (bytesRead > 0) {

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

                }

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

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

                Log.i(LOG, "HTTP Response is : "+ serverResponseMessage + ": " + serverResponseCode);

                if(serverResponseCode == 200){

                    runOnUiThread(new Runnable() {
                        public void run() {

                            Toast.makeText(CreateSetcardStep1Activity.this, "File Upload Complete.",
                                    Toast.LENGTH_SHORT).show();
                        }
                    });
                }

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

            } catch (MalformedURLException ex) {

                dialog.dismiss();
                ex.printStackTrace();

                runOnUiThread(new Runnable() {
                    public void run() {

                        Toast.makeText(CreateSetcardStep1Activity.this, "MalformedURLException",
                                Toast.LENGTH_SHORT).show();
                    }
                });

                Log.e(LOG, "error: " + ex.getMessage(), ex);
            } catch (Exception e) {

                dialog.dismiss();
                e.printStackTrace();

                runOnUiThread(new Runnable() {
                    public void run() {

                        Toast.makeText(CreateSetcardStep1Activity.this, "Got Exception : see logcat ",
                                Toast.LENGTH_SHORT).show();
                    }
                });
                Log.e(LOG, "Exception : "
                        + e.getMessage(), e);
            }
            dialog.dismiss();
            return serverResponseCode;

        }
    }
}

有没有办法检查问题出在哪里?logcat在断点2处停止:断点2目标:/storage/simulated/0/20171215-051851。jpg公司 如果我检查资源管理器,文件就在那里