HttpURLconnection yourConnection = getConnectionSomeWay();
InputStream inputStream = yourConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(inputStream, "US-ASCII");
BufferedReader bufferedReader = new BufferedReader(reader);
System.out.println(bufferedReader.readLine());
Или, более короткая версия:
HttpURLconnection yourConnection = getConnectionSomeWay();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(yourConnection.getInputStream(), "US-ASCII"));
System.out.println(bufferedReader.readLine());
Или, если вы имели в виду запись ответа в ASCII, то в основном это так же:
HttpURLconnection yourConnection = getConnectionSomeWay();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(yourConnection.getOutputStream(), "US-ASCII"));
bufferedWriter.write("Hello world!");
bufferedWriter.flush();