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public static void main(String[] args) throws IOException {

    int port = 20105;

    String macAddress = "01-12-43-44-D5-56";

    // String destIP = "255.255.255.255";// 广播地址

    String destIP = "112.11.15.28";// 广播地址

    // 检测 mac 地址,并将其转换为二进制

    byte[] destMac = getMacBytes(macAddress);

    if (destMac == null)

        return;

    InetAddress destHost = InetAddress.getByName(destIP);

    // construct packet data

    byte[] magicBytes = new byte[102];

    // 将数据包的前6位放入0xFF即 "FF"的二进制

    for (int i = 0; i < 6; i++)

        magicBytes[i] = (byte) 0xFF;

        // 从第7个位置开始把mac地址放入16次

        for (int i = 0; i < 16; i++) {

            for (int j = 0; j < destMac.length; j++) {

                magicBytes[6 + destMac.length * i + j] = destMac[j];

            }

        }

        // create packet

        DatagramPacket dp = null;

        dp = new DatagramPacket(magicBytes, magicBytes.length, destHost, port);

        DatagramSocket ds = new DatagramSocket();

        ds.send(dp);

        ds.close();

        System.out.println("ok");

}

private static byte[] getMacBytes(String macStr) throws IllegalArgumentException {

    byte[] bytes = new byte[6];

    String[] hex = macStr.split("(\\:|\\-)");

    if (hex.length != 6) {

        throw new IllegalArgumentException("Invalid MAC address.");

    }

    try {

        for (int i = 0; i < 6; i++) {

            bytes[i] = (byte) Integer.parseInt(hex[i], 16);

        }

    } catch (NumberFormatException e) {

        throw new IllegalArgumentException("Invalid hex digit in MAC address.");

    }

    return bytes;

}