随机生成MAC地址和IP地址

            //MAC地址分隔符
　　　　　　　private static String SEPARATOR_OF_MAC = "-";

　　　　　　　Random random = new Random();
　　　　　　　　//mac数据
            String[] macs = {
                    String.format("%02x", 0x52),
                    String.format("%02x", 0x54),
                    String.format("%02x", 0x00),
                    String.format("%02x", random.nextInt(0xff)),
                    String.format("%02x", random.nextInt(0xff)),
                    String.format("%02x", random.nextInt(0xff))
            };
            String mac = String.join(SEPARATOR_OF_MAC, macs).toUpperCase();

    //IP使用数据
    private static final int[][] range = {
            {607649792, 608174079}, // 36.56.0.0-36.63.255.255
            {1038614528, 1039007743}, // 61.232.0.0-61.237.255.255
            {1783627776, 1784676351}, // 106.80.0.0-106.95.255.255
            {2035023872, 2035154943}, // 121.76.0.0-121.77.255.255
            {2078801920, 2079064063}, // 123.232.0.0-123.235.255.255
            {-1950089216, -1948778497}, // 139.196.0.0-139.215.255.255
            {-1425539072, -1425014785}, // 171.8.0.0-171.15.255.255
            {-1236271104, -1235419137}, // 182.80.0.0-182.92.255.255
            {-770113536, -768606209}, // 210.25.0.0-210.47.255.255
            {-569376768, -564133889}, // 222.16.0.0-222.95.255.255
    };
　　//实际代码
    Random random = new Random();
    String ip = num2ip(range[index][0] + new Random().nextInt(range[index][1] - range[index][0]));
　　/**
     * IP生成工具方法
     */
    public static String num2ip(int ip) {
        int[] b = new int[4];
        String ipStr = "";
        b[0] = (int) ((ip >> 24) & 0xff);
        b[1] = (int) ((ip >> 16) & 0xff);
        b[2] = (int) ((ip >> 8) & 0xff);
        b[3] = (int) (ip & 0xff);
        ipStr = Integer.toString(b[0]) + "." + Integer.toString(b[1]) + "." + Integer.toString(b[2]) + "." + Integer.toString(b[3]);
 
        return ipStr;
    }