Java 获取MAC

package com.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MacAddress
{
    private static final String[] windowsCommand = {"ipconfig", "/all"};
    private static final String[] linuxCommand = {"/sbin/ifconfig", "-a"};
    private static final Pattern macPattern = Pattern.compile(".*((:?[0-9a-f]{2}[-:]){5}[0-9a-f]{2}).*", Pattern.CASE_INSENSITIVE);
    private static List<String> getMacAddressList() throws IOException {
        ArrayList<String> macAddressList = new ArrayList<String>();
        final String os = System.getProperty("os.name");
        final String[] command;
        if (os.startsWith("Windows")) {
            command = windowsCommand;
        } else if (os.startsWith("Linux")) {
            command = linuxCommand;
        } else {
            throw new IOException("Unknown operating system: " + os);
        }
        final Process process = Runtime.getRuntime().exec(command);
        // Discard the stderr
        new Thread() {
            @Override
            public void run() {
                try {
                    InputStream errorStream = process.getErrorStream();
                    while (errorStream.read() != -1) {
                    }
                    errorStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
        // Extract the MAC addresses from stdout
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        for (String line = null; (line = reader.readLine()) != null;) {
            Matcher matcher = macPattern.matcher(line);
            if (matcher.matches()) {
                //macAddressList.add(matcher.group(1));
                macAddressList.add(matcher.group(1).replaceAll("[-:]", ""));
            }
        }
        reader.close();
        return macAddressList;
    }
    public static String getMacAddress() {
        try {
            List<String> addressList = getMacAddressList();
            if (addressList.isEmpty()) {
                return "";
            }
            return addressList.get(0);
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }
      
    public static List<String> getMacAddressList2() {
        List<String> addressList=new ArrayList<String>();
        try {
            List<String> temp = getMacAddressList();
            addressList=temp;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return addressList;
    }
    public static String[] getMacAddresses() {
        try {
            return getMacAddressList().toArray(new String[0]);
        } catch (IOException e) {
            e.printStackTrace();
            return new String[0];
        }
    }
      
    public static void main(String[] args) {
        MacAddress mac = new MacAddress();
        System.out.println("本电脑的MAC地址为："+mac.getMacAddress());
    }
}