package midiplayer;import javax.sound.midi.*;import java.io.*;import java.net.*;/** * <p>Title: MIDI播放器</p> * <p>Description: 使用javax.sound.midi包中的類實現(xiàn)MIDI文件的播放</p> * <p>Copyright: Copyright (c) 2004</p> * <p>Company: 北京師范大學(xué)計算機(jī)系</p> * @author 曾文琪 * @version 1.0 */public class MIDIPlayer {  private static String midiFile = "canyon.mid";  private static String midiURI = "http://.../canyon.mid";  private Sequence sequence =null;  public MIDIPlayer() {    this.loadAndPlay();  }  public void loadAndPlay(){    try {        sequence = MidiSystem.getSequence(new File(midiFile));        // 讀網(wǎng)絡(luò)地址URL中MIDI文件//        sequence = MidiSystem.getSequence(new URL("http://hostname/midifile"));        Sequencer sequencer = MidiSystem.getSequencer();        sequencer.open();        sequencer.setSequence(sequence);        double durationInSecs = sequencer.getMicrosecondLength() / 1000000.0;        System.out.println("the duration of this audio is "+durationInSecs+"secs.");        double seconds = sequencer.getMicrosecondPosition() / 1000000.0;        System.out.println("the Position of this audio is "+seconds+"secs.");        if (sequencer instanceof Synthesizer) {                Synthesizer synthesizer = (Synthesizer)sequencer;                MidiChannel[] channels = synthesizer.getChannels();                double gain = 0.9D;                for (int i=0; i<channels.length; i++) {                    channels[i].controlChange(7, (int)(gain * 127.0));                }            }        sequencer.start();        Thread.currentThread().sleep(5000);        seconds = sequencer.getMicrosecondPosition() / 1000000.0;        System.out.println("the Position of this audio is "+seconds+"secs.");        sequencer.addMetaEventListener(        new MetaEventListener() {            public void meta(MetaMessage event) {                if (event.getType() == 47) {                    System.out.println("Sequencer is done playing.");                }            }        });    }catch (MalformedURLException e) {    }catch (IOException e) {    }catch (MidiUnavailableException e) {    }catch (InvalidMidiDataException e) {    }catch (InterruptedException e){    }  }  public static void main(String[] args) {    MIDIPlayer midiplayer = new MIDIPlayer();  }}