InputStreamをStringに変換する

java 
public static String inputStreemToString(InputStream in) throws IOException{
    BufferedReader reader =
        new BufferedReader(new InputStreamReader(in, "UTF-8"/* 文字コード指定 */));
    StringBuffer buf = new StringBuffer();
    String str;
    while ((str = reader.readLine()) != null) {
            buf.append(str);
            buf.append("\n");
    }
    return buf.toString();
}