Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import android.util.Log;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class Main {
    public static void sendWoLMagicPacket(final String broadcastIp, final String macAddress) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    byte[] macBytes = getMacBytes(macAddress);
                    byte[] bytes = new byte[6 + 16 * macBytes.length];
                    for (int i = 0; i < 6; i++) {
                        bytes[i] = (byte) 0xff;
                    }
                    for (int i = 6; i < bytes.length; i += macBytes.length) {
                        System.arraycopy(macBytes, 0, bytes, i, macBytes.length);
                    }

                    InetAddress address = InetAddress.getByName(broadcastIp);
                    DatagramPacket packet = new DatagramPacket(bytes, bytes.length, address, 9);
                    DatagramSocket socket = new DatagramSocket();
                    socket.send(packet);
                    socket.close();

                    packet = new DatagramPacket(bytes, bytes.length, address, 7);
                    socket = new DatagramSocket();
                    socket.send(packet);
                    socket.close();

                    Log.e("WAKE_UP", "Wake-on-LAN packet sent.");
                    final String output = getStringFromBytes(bytes);
                    Log.i("WAKE_UP", output);
                } catch (Exception e) {
                    Log.e("WAKE_UP", "Failed to send Wake-on-LAN packet: " + e);

                }
            }
        }).start();
    }

    public 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;
    }

    public static String getStringFromBytes(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 3);
        for (byte b : bytes) {
            String hex = Integer.toHexString(0xFF & b);
            if (hex.length() == 1)
                hex = '0' + hex;

            sb.append(hex + ' ');
        }

        return sb.toString();
    }
}