package com.simonjia.util.other;

import java.net.InetAddress;import java.net.InterfaceAddress;import java.net.NetworkInterface;import java.util.ArrayList;import java.util.List;import java.util.stream.Collectors;

public class MacTools {    /***因为一台机器不一定只有一个网卡呀，所以返回的是数组是很合理的***/    public static List<String> getMacList() throws Exception {        java.util.Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();        StringBuilder sb = new StringBuilder();        ArrayList<String> tmpMacList = new ArrayList<>();        while (en.hasMoreElements()) {            NetworkInterface iface = en.nextElement();            List<InterfaceAddress> addrs = iface.getInterfaceAddresses();            for (InterfaceAddress addr : addrs) {                InetAddress ip = addr.getAddress();                NetworkInterface network = NetworkInterface.getByInetAddress(ip);                if (network == null) {                    continue;                }                byte[] mac = network.getHardwareAddress();                if (mac == null) {                    continue;                }                sb.delete(0, sb.length());                for (int i = 0; i < mac.length; i++) {                    sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));                }                tmpMacList.add(sb.toString());            }        }        if (tmpMacList.size() <= 0) {            return tmpMacList;        }        /***去重，别忘了同一个网卡的ipv4,ipv6得到的mac都是一样的，肯定有重复，下面这段代码是。。流式处理***/        List<String> unique = tmpMacList.stream().distinct().collect(Collectors.toList());        return unique;    }

    public static void main(String[] args) throws Exception {        long a = System.currentTimeMillis();        System.out.println("进行 multi net address 测试===》");        List<String> macs = getMacList();        long b = System.currentTimeMillis();        System.out.println("本机的mac网卡的地址有：" + macs);        System.out.println("总耗时----" + (b - a) + "-----ms");    }}