java学习笔记_MIDI

import javax.sound.midi.*;

public class Midi {
    public void play(int instrument, int note) {
        try {
            Sequencer player = MidiSystem.getSequencer();
            player.open();
            
            Sequence seq = new Sequence(Sequence.PPQ, 4);//divisionType, resolution
            
            Track track = seq.createTrack();
            
            ShortMessage first = new ShortMessage();
            first.setMessage(192, 1, instrument, 0);
            MidiEvent change = new MidiEvent(first, 1);
            track.add(change);
            
            ShortMessage a = new ShortMessage();
            a.setMessage(144, 1, note, 100);//command channel data1 data2
                                           //144 -note on 128 -note off
                                           //1 - 频道
                                           //44 - 音符 0-127
                                           //100 - 音道 
            MidiEvent noteOn = new MidiEvent(a, 1); //tick - the time-stamp for the event, in MIDI ticks
            track.add(noteOn);
            
            ShortMessage b = new ShortMessage();
            b.setMessage(128, 1, note, 100);//command channel data1 data2
            MidiEvent noteOff = new MidiEvent(b, 16); //tick - the time-stamp for the event, in MIDI ticks
            track.add(noteOff);
            
            player.setSequence(seq);
            player.start();
            //while( player.isRunning() ) {
            //    try {
            //        Thread.sleep(1000);
            //    } catch (Exception e) {}
            //}
            //player.close();
            
        } catch( Exception ex) {
            ex.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        if (args.length < 2) {
            System.out.println("Don't forget the instrument and note args");
        }
        else {
            int instrument = Integer.parseInt(args[0]);
            int note = Integer.parseInt(args[1]);
            Midi midi = new Midi();
            midi.play(instrument, note);
        }        
    }
}