hex String <-> byte array 변환

1. hex string -> byte array

byte[] bytes = new java.math.BigInteger(hexText, 16).toByteArray();

2. byte array -> hex string

String hexText = new java.math.BigInteger(bytes).toString(16);

Sample

public static String toHexString(byte buf[]) {
	StringBuffer sb = new StringBuffer();
	for (int i = 0; i < buf.length; i++) {
		sb.append(Integer.toHexString(0x0100 + (buf[i] & 0x00FF)).substring(1));
        }
	return sb.toString();
}