Compress the image with base64 and send post from android to php - php

Question

ByteArrayOutputStream bytearray = new ByteArrayOutputStream();
mBitmapProfile.compress(Bitmap.CompressFormat.JPEG, 100, bytearray);
String base64 = Base64.encodeToString(bytearray.toByteArray(), Base64.DEFAULT);
String data = URLEncoder.encode("SOURCE", "UTF-8") + "=" base64;
String result = getHttpData("http://example/p.php", data);
private String getHttpData(String httpUrl, String param) {
String urlString = httpUrl;
String data = param;
try {
URL url = new URL(urlString);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// urlConnection.setConnectTimeout(CONNECTION_TIMEOUT);
// urlConnection.setReadTimeout(DATARETRIEVAL_TIMEOUT);
urlConnection.setRequestMethod("POST");
urlConnection.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(urlConnection.getOutputStream());
wr.write(data);
wr.flush();
int responseCode = urlConnection.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
BufferedReader br=new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String response = "";
String line = "";
while ((line = br.readLine()) != null) {
response+=line;
}
return response;
}
} catch(MalformedURLException e){
e.printStackTrace();
return null;
} catch(IOException e) {
e.printStackTrace();
return null;
}
return "";
}
After base64 encoding the image
Using POST, making requests from Android to PHP will cause problems.
ex)
android send data : /9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBA+BAQEBAQE==
php receive data : /9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBABAQEBAQE
Some special characters are lost.
Why is that so?

Answer 1

The problem is that base64 encoded data can contain '+' characters. In x-www-form-urlencoded data the receiver knows that '+' is an encoding of a space character. Thus since you aren't URL encoding your base64 value, any instances of '+' will cause the data to be corrupted when received.