public static byte[] Unicode2Byte(String s) {

   int len = s.length();

   byte abyte[] = new byte[len << 1];

   int j = 0;

   for (int i = 0; i < len; i++) {

    char c = s.charAt(i);

    abyte[j++] = (byte) (c >> 8);

    abyte[j++] = (byte) (c & 0xff);

   }

   return abyte;

  }