<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.77.Final</version>
</dependency>

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

public static ByteBuf strToBytoBuf(String strData)
{
    return Unpooled.wrappedBuffer(strData.getBytes(StandardCharsets.UTF_8));
}
public static String ByteBufToStr(ByteBuf byteBuf)
{
    return byteBuf.toString(CharsetUtil.UTF_8);
}

<dependency>
    <groupId>commons-cli</groupId>
    <artifactId>commons-cli</artifactId>
    <version>1.4</version>
</dependency>

import org.apache.commons.cli.*;

Options options = new Options();
Option input = new Option("t", "type", true, "running type");
input.setRequired(true);
options.addOption(input);

CommandLineParser parser = new DefaultParser();
HelpFormatter formatter = new HelpFormatter();
CommandLine cmd = null;

try {
    cmd = parser.parse(options, args);
} catch (ParseException e) {
    System.out.println(e.getMessage());
    formatter.printHelp("utility-name", options);

    System.exit(1);
}

String runtype = cmd.getOptionValue("type");

if (runtype.equals("1")) {

import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
import org.bouncycastle.util.encoders.Base64;

public static String Base64Encode(byte[] bytes)
{
    return new String(Base64.encode(bytes));
}
public static byte[] Base64Decode(String data)
{
    return Base64.decode(data);
}
public static byte[] SHA256(byte[] source) {
    try {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        byte[] bytes = md.digest(source);
        return bytes;
    }
    catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

public static String getNowMilSendFormat()
{
    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
    Date dd = new Date(System.currentTimeMillis());
    return sdf.format(dd);
}
public static String getNowDateSendFormat()
{
    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
    Date dd = new Date(System.currentTimeMillis());
    return sdf.format(dd);
}

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

public static String getAddress1()
{
    String rtnVal= "";
    InetAddress ip;
    try {

        ip = InetAddress.getLocalHost();
        System.out.println("Current IP address : " + ip.getHostAddress());

        rtnVal = ip.getHostAddress();

    } catch (Exception e) {

        e.printStackTrace();

    }
    return rtnVal;
}
public static String getMacAddress1()
{
    String rtnVal= "";
    InetAddress ip;
    try {

        ip = InetAddress.getLocalHost();
        //System.out.println("Current IP address : " + ip.getHostAddress());

        NetworkInterface network = NetworkInterface.getByInetAddress(ip);

        byte[] mac = network.getHardwareAddress();

        System.out.print("Current MAC address : ");

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < mac.length; i++) {
            sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
        }
        System.out.println(sb.toString());
        rtnVal = sb.toString();

    } catch (Exception e) {

        e.printStackTrace();

    }
    return rtnVal;
}