public static byte[] hexToBytes(String hexString) {
        if (hexString == null) return null;
        byte[] bytes = new byte[hexString.length()/2];
        for (int i=0; i<bytes.length; i++) {
            bytes[i] = (byte)Integer.parseInt(hexString.substring(i*2, i*2+2), 16);            
        }
        return bytes;
    }

------解决方案--------------------
你结贴率不高，不回答.......

------解决方案--------------------
hexStr.getbytes();