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t-io is a aio framework for java
There is a newer version: 3.7.3.v202400213-RELEASE
package com.litongjava.tio.utils.network;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * MAC地址工具
 * 
 */
public class MacUtils {

  /**
   * 获取当前操作系统名称. return 操作系统名称 例如:windows,Linux,Unix等.
   */
  public static String getOSName() {
    return System.getProperty("os.name").toLowerCase();
  }

  /**
   * 获取Unix网卡的mac地址.
   * 
   * @return mac地址
   */
  public static String getUnixMACAddress() {
    String mac = null;
    BufferedReader bufferedReader = null;
    Process process = null;
    try {
      /**
       * Unix下的命令，一般取eth0作为本地主网卡 显示信息中包含有mac地址信息
       */
      process = Runtime.getRuntime().exec("ifconfig eth0");
      bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
      String line = null;
      int index = -1;
      while ((line = bufferedReader.readLine()) != null) {
        /**
         * 寻找标示字符串[hwaddr]
         */
        index = line.toLowerCase().indexOf("hwaddr");
        /**
         * 找到了
         */
        if (index != -1) {
          /**
           * 取出mac地址并去除2边空格
           */
          mac = line.substring(index + "hwaddr".length() + 1).trim();
          break;
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (bufferedReader != null) {
          bufferedReader.close();
        }
      } catch (IOException e1) {
        e1.printStackTrace();
      }
      bufferedReader = null;
      process = null;
    }

    return mac;
  }

  /**
   * 获取Linux网卡的mac地址.
   * 
   * @return mac地址
   */
  public static String getLinuxMACAddress() {
    String mac = null;
    BufferedReader bufferedReader = null;
    Process process = null;
    try {
      /**
       * linux下的命令，一般取eth0作为本地主网卡 显示信息中包含有mac地址信息
       */
      process = Runtime.getRuntime().exec("ifconfig eth0");
      bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
      String line = null;
      int index = -1;
      while ((line = bufferedReader.readLine()) != null) {
        index = line.toLowerCase().indexOf("硬件地址");
        /**
         * 找到了
         */
        if (index != -1) {
          /**
           * 取出mac地址并去除2边空格
           */
          mac = line.substring(index + 4).trim();
          break;
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (bufferedReader != null) {
          bufferedReader.close();
        }
      } catch (IOException e1) {
        e1.printStackTrace();
      }
      bufferedReader = null;
      process = null;
    }

    // 取不到，试下Unix取发
    if (mac == null) {
      return getUnixMACAddress();
    }

    return mac;
  }

  /**
   * 获取widnows网卡的mac地址.
   * 
   * @return mac地址
   */
  public static String getWindowsMACAddress() {
    String mac = null;
    BufferedReader bufferedReader = null;
    Process process = null;
    try {
      /**
       * windows下的命令，显示信息中包含有mac地址信息
       */
      process = Runtime.getRuntime().exec("ipconfig /all");
      bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
      String line = null;
      int index = -1;
      while ((line = bufferedReader.readLine()) != null) {
        /**
         * 寻找标示字符串[physical address]
         */
//				index = line.toLowerCase().indexOf("physical address");
//				if (index != -1) {
        if (line.split("-").length == 6) {
          index = line.indexOf(":");
          if (index != -1) {
            /**
             * 取出mac地址并去除2边空格
             */
            mac = line.substring(index + 1).trim();
          }
          break;
        }
        index = line.toLowerCase().indexOf("物理地址");
        if (index != -1) {
          index = line.indexOf(":");
          if (index != -1) {
            /**
             * 取出mac地址并去除2边空格
             */
            mac = line.substring(index + 1).trim();
          }
          break;
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (bufferedReader != null) {
          bufferedReader.close();
        }
      } catch (IOException e1) {
        e1.printStackTrace();
      }
      bufferedReader = null;
      process = null;
    }

    return mac;
  }

  public static String getMac() {
    String os = getOSName();
    String mac;
    if (os.startsWith("windows")) {
      mac = getWindowsMACAddress();
    } else if (os.startsWith("linux")) {
      mac = getLinuxMACAddress();
    } else {
      mac = getUnixMACAddress();
    }
    return mac == null ? "" : mac;
  }
}