C2DM 연동 AUTH값 받아오기

서버단에서 처리하는 소스중 일부입니다.

String accountType     = "HOSTED_OR_GOOGLE";
String email           = "메일";
String passwd          = "비밀번호";
String service         = "ac2dm";
String source          = "메시지";
String auth            = "";

String param  = "https://www.google.com/accounts/ClientLogin?";
       param += "accountType=" + accountType;
       param += "&Email=" + email;
       param += "&Passwd=" + passwd;
       param += "&service=" + service;
       param += "&source=" + source;
try{
    URL url = new URL(param);
    HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
    urlConnection.connect();  //url요청을 합니다.
    
    int result = urlConnection.getResponseCode();
    
    if(result == urlConnection.HTTP_OK){
    
        InputStream inputStream = urlConnection.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String readLine;
        while ((readLine = reader.readLine()) != null) { AUTH값이 오면 INPUT스트림으로 받아서 스트링으로 저장합니다.
            auth += readLine;
        }
        reader.close();
    }
    int num = auth.indexOf("Auth="); Auth값의 위치 파악후 auth값만 가져옵니다.
    auth = auth.substring(num+5);
}catch(Exception e){
    System.out.println(e.toString());
}