Is it possible to check progress of URLconnection.getInputStream()?
I want to check progress of downloading file by URLconnection. Is it possible or should I use another library? This is my urlconnection function:
public static String sendPostRequest(String httpURL, String data) throws UnsupportedEncodingException, MalformedURLException, IOException {
URL url = new URL(httpURL);
URLConnection conn = url.openConnection();
//conn.addRequestProperty("Content-Type", "text/html; charset=iso-8859-2");
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream(), "ISO-8859-2"));
String line, all = "";
while ((line = rd.readLine()) != null) {
all = all + line;
}
wr.close();
rd.close();
return all;
}
I understand that whole file is downloaded in this line (or worng)?:
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream(), "ISO-8859-2"));
So is it possible to do this in this code?
Answer
Just check if the HTTP Content-Length header is present in the response.
int contentLength = connection.getContentLength();
if (contentLength != -1) {
// Just do (readBytes / contentLength) * 100 to calculate the percentage.
} else {
// You're lost. Show "Progress: unknown"
}
Update as per your update, you're wrapping the InputStream inside a BufferedReader and reading inside a while loop. You can count the bytes as follows:
int readBytes = 0;
while ((line = rd.readLine()) != null) {
readBytes += line.getBytes("ISO-8859-2").length + 2; // CRLF bytes!!
// Do something with line.
}
The + 2 is to cover the CRLF (carriage return and linefeed) bytes which are eaten by BufferedReader#readLine(). More clean approach would be to just read it by InputStream#read(buffer) so that you don't need to massage the bytes forth and back from characters to calculate the read bytes.