使用Base64将文件从android上传到mysql数据库？

Question

我正在创建一个Android移动应用程序，用户可以在其中将文件上传到服务器。

我使用以下代码成功将图像上传到服务器：

    public String getStringImage(Bitmap bmp){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] imageBytes = baos.toByteArray();
    String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
    return encodedImage;
}

我尝试使用以下代码发送文件，但它无法正常工作。

public String convertFileToBase64String(File f) throws IOException {
    InputStream inputStream = new FileInputStream(f.getAbsolutePath());
    byte[] bytes;
    byte[] buffer = new byte[8192];
    int bytesRead;
    ByteArrayOutputStream baos  = new ByteArrayOutputStream();

    while ((bytesRead = inputStream.read(buffer)) != -1) {
        baos.write(buffer, 0, bytesRead);
    }
    bytes = baos.toByteArray();
    String encodedFile = Base64.encodeToString(bytes, Base64.DEFAULT);
    return encodedFile;
}

这里是上传的方法：

 private void uploadFile(){
    //Showing the progress dialog
    final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
    StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String s) {
                    //Disimissing the progress dialog
                    loading.dismiss();
                    //Showing toast message of the response
                    Toast.makeText(MainActivity.this, s, Toast.LENGTH_LONG).show();
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    //Dismissing the progress dialog
                    loading.dismiss();

                    if (error instanceof TimeoutError || error instanceof NoConnectionError) {

                        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AppTheme);
                        builder.setMessage("Check your connection");
                        builder.setPositiveButton("OK", null);
                        builder.setCancelable(false);
                        builder.show();

                    } else if (error instanceof AuthFailureError) {
                        //TODO

                        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AppTheme);
                        builder.setMessage("Authentication Failure");
                        builder.setPositiveButton("OK", null);
                        builder.setCancelable(false);
                        builder.show();

                    } else if (error instanceof ServerError) {
                        //TODO

                        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AppTheme);
                        builder.setMessage("Error in server");
                        builder.setPositiveButton("OK", null);
                        builder.setCancelable(false);
                        builder.show();

                    } else if (error instanceof NetworkError) {
                        //TODO

                        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AppTheme);
                        builder.setMessage("An error in the network");
                        builder.setPositiveButton("OK", null);
                        builder.setCancelable(false);
                        builder.show();

                    } else if (error instanceof ParseError) {
                        //TODO

                        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AppTheme);
                        builder.setMessage("The server response could not be parsed");
                        builder.setPositiveButton("OK", null);
                        builder.setCancelable(false);
                        builder.show();

                    }
                   else
                        Toast.makeText(MainActivity.this, error.getMessage().toString(), Toast.LENGTH_LONG).show();

                }
            }){
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            //Converting Bitmap to String

            String uploaded_file = null;
            try {
                uploaded_file = convertFileToBase64String(file);
            } catch (IOException e) {
                e.printStackTrace();
            }

            //Getting Image Name
            String name = editTextName.getText().toString().trim();

            //Creating parameters
            Map<String,String> params = new Hashtable<String, String>();

            //Adding parameters
            params.put(KEY_FILE, uploaded_file);
            params.put(KEY_NAME, name);

            //returning parameters
            return params;
        }
    };

    //Creating a Request Queue
    RequestQueue requestQueue = Volley.newRequestQueue(this);

    //Adding request to the queue
    requestQueue.add(stringRequest);
}

打开文件的方法：

public void openFile(String minmeType) {

    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.setType(minmeType);
    intent.addCategory(Intent.CATEGORY_OPENABLE);

    // special intent for Samsung file manager
    Intent sIntent = new Intent("com.sec.android.app.myfiles.PICK_DATA");
    // if you want any file type, you can skip next line
    sIntent.putExtra("CONTENT_TYPE", minmeType);
    sIntent.addCategory(Intent.CATEGORY_DEFAULT);

    Intent chooserIntent;
    if (getPackageManager().resolveActivity(sIntent, 0) != null){
        // it is device with samsung file manager
        chooserIntent = Intent.createChooser(sIntent, "Choose File");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] { intent});
    }
    else {
        chooserIntent = Intent.createChooser(intent, "Choose File");
    }

    try {
        startActivityForResult(chooserIntent, FILE_REQUEST);
    } catch (android.content.ActivityNotFoundException ex) {
        Toast.makeText(getApplicationContext(), "No suitable file manager has been found", Toast.LENGTH_SHORT).show();
    }
}

OnActivity：

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == FILE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {

        String FileName = data.getData().getLastPathSegment();

        editTextName.setText(FileName);

    }
}