import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
 
public class WakeOnLan {
 
    public static void main(String[] args) {
        String macAddress = "00:11:22:33:44:55"; // 目標(biāo)設(shè)備的MAC地址
        String broadcastIp = "192.168.1.255";    // 局域網(wǎng)廣播地址（或255.255.255.255）
        int port = 9;                            // WOL常用端口
 
        try {
            wakeUp(macAddress, broadcastIp, port);
            System.out.println("已發(fā)送開機(jī)魔術(shù)包！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    public static void wakeUp(String macAddress, String broadcastIp, int port) throws Exception {
        // 1. 驗(yàn)證MAC地址格式并轉(zhuǎn)換為字節(jié)數(shù)組
        byte[] macBytes = parseMacAddress(macAddress);
 
        // 2. 構(gòu)建魔術(shù)包（102字節(jié)）
        byte[] magicPacket = new byte[102];
        
        // 前6字節(jié)為0xFF
        for (int i = 0; i < 6; i++) {
            magicPacket[i] = (byte) 0xFF;
        }
        
        // 重復(fù)16次MAC地址
        for (int i = 6; i < magicPacket.length; i += macBytes.length) {
            System.arraycopy(macBytes, 0, magicPacket, i, macBytes.length);
        }
 
        // 3. 通過(guò)UDP廣播發(fā)送
        try (DatagramSocket socket = new DatagramSocket()) {
            socket.setBroadcast(true); // 啟用廣播
            InetAddress address = InetAddress.getByName(broadcastIp);
            DatagramPacket packet = new DatagramPacket(magicPacket, magicPacket.length, address, port);
            socket.send(packet);
        }
    }
 
    private static byte[] parseMacAddress(String macAddress) throws IllegalArgumentException {
        // 移除分隔符（如:、-）
        String cleanMac = macAddress.replaceAll("[:\\-]", "").toLowerCase();
        
        // 驗(yàn)證長(zhǎng)度（12個(gè)十六進(jìn)制字符）
        if (cleanMac.length() != 12 || !cleanMac.matches("[0-9a-f]{12}")) {
            throw new IllegalArgumentException("無(wú)效的MAC地址格式");
        }
 
        // 轉(zhuǎn)換為字節(jié)數(shù)組
        byte[] bytes = new byte[6];
        for (int i = 0; i < 6; i++) {
            String hex = cleanMac.substring(i * 2, i * 2 + 2);
            bytes[i] = (byte) Integer.parseInt(hex, 16);
        }
        return bytes;
    }
}