16进制转byte[]

public static byte[] toByteArr(String s) {
		byte[] baKeyword = new byte[s.length() / 2];
		for (int i = 0; i < baKeyword.length; i++)
		{
			try
			{
				baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2,
						i * 2 + 2), 16));
			}
			catch (Exception e)
			{
				e.printStackTrace();
			}
		}
		return baKeyword;
	}