JAVA获取指定的类型的本机MAC地址

前面我们运维小伙在部署的时候,发现在真实服务器获取不到mac地址或者获取不到指定类型的mac地址,写程序记录如下

import com.google.common.base.Strings;

import java.net.NetworkInterface;
import java.util.Enumeration;

public class MacHelper {

    private static MacHelper instance;

    public static MacHelper getInstance() {

        if (instance == null) {
            synchronized (MacHelper.class) {
                instance = new MacHelper();
            }
        }

        return instance;
    }

    /**
     * 获取本地IP
     *
     * @return String
     */
    public String getFirstLocalMac() {
        String startName = "eth", symbol = "";
        return getFirstLocalMac(startName, symbol);
    }

    /**
     * 获取本地IP
     *
     * @return String
     */
    public String getFirstLocalMac(String startName, String symbol) {

        try {

            Enumeration<NetworkInterface> enumeration = NetworkInterface.getNetworkInterfaces();

            while (enumeration.hasMoreElements()) {

                NetworkInterface networkInterface = enumeration.nextElement();

                if (networkInterface == null) {
                    continue;
                }

                if (!(networkInterface.getName().equals(startName) ||
                        networkInterface.getName().startsWith(startName))) {
                    continue;
                }

                //获取网卡，获取地址
                byte[] mac = networkInterface.getHardwareAddress();

                if (mac == null || mac.length <= 0) {
                    continue;
                }

                StringBuilder sb = new StringBuilder();

                int i = 0;

                for (byte b : mac) {
                    //字节转换为整数
                    int temp = b & 0xff;
                    String str = Integer.toHexString(temp);

                    if (!Strings.isNullOrEmpty(symbol) && i == 0) {
                        sb.append(symbol);
                    }

                    if (str.length() == 1) {
                        sb.append("0").append(str);
                    } else {
                        sb.append(str);
                    }

                    i++;
                }

                return sb.toString().toLowerCase();

            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return "";
    }
}