How to parse characters non ascii in a string

Question

i am stucked in this crictical problem and i don't know how to cater this. I sometimes receive this String ����►☻☺ and sometimes these are non US-ASCII characters. These ����►☻☺ characters are replaced by ????? and is represented as it is. I sometime receive this character �� too. These characters are in ANSI list but i want to receive only US-ASCII. Please help me out that how to identify these characters in the string.

Answer 1

Basically i am getting that string from the user in an sms. The text of the sms is saved in the database.I get that sms from database in string form. now i want to parse the string to identify the non us-ascii characters in the string. This parsing is important because when i try to post data on the url i get the http response code 400 which creates an exception and i get stucked in an infinite while loop.
HttpURLConnection urlcon =null;
String postingdata="&message="+ URLEncoder.encode(ob.getmessage(),"UTF-8")
System.out.println(postingdata);
URL url = new URL("http://someurl");
urlcon = (HttpURLConnection)url.openConnection();
urlcon.setDoOutput(true);
urlcon.setRequestMethod("POST");
OutputStreamWriter wr = new OutputStreamWrite(urlcon.getOutputStream());
wr.write(postingdata);
wr.flush();
BufferedReader rd = new BufferedReader(new InputStreamReader(urlcon.getInputStream()));
rd.close();
wr.close();