将byte数组转换为十六进制字符串

private static String parseByte2HexStr(byte[] buf)
    {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++)
        {
            String hex = Integer.toHexString(buf[i] & HEX_255);
            if (hex.length() == 1)
            {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase(Locale.US));
        }
        return sb.toString();
    }