playmidi.java

一款Java开发的打飞机小游戏

import java.io.*;
import javax.sound.midi.*;
import java.net.URL;

/**
 * 播放Midi音乐
 * @author  fantasyer
 * @version 1.0
 */
public class PlayMidi
{
    private static Sequence sequence;    //存放音乐数据
    private static Sequencer sequencer;  //用于播放sequence

    /**
     * 加载Midi资源
     * @param fileName 文件名称
     */
    public static void loadMidi(String fileName)
    {
        try
        {
            URL url = Class.forName("PlayMidi").getClassLoader().getResource(fileName);
            sequence = MidiSystem.getSequence(url);
            sequencer = MidiSystem.getSequencer();
            sequencer.open();
            sequencer.setSequence(sequence);
            sequencer.addMetaEventListener(new MetaEventListener()
            {
                public void meta(MetaMessage e)
                {
                    if (e.getType()==47)
                    {
                        sequencer.close();
                    }
                }
            });
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    /**
     * 播放Midi声音文件
     * @param isloop 是否循环播放
     */
    public static void play(boolean isloop)
    {
        if (sequencer==null)
        {
            return;
        }

        try
        {
            if (isloop)
            {
                sequencer.setLoopStartPoint(0);
                sequencer.setLoopEndPoint(-1);
                sequencer.setLoopCount(Sequencer.LOOP_CONTINUOUSLY);
            }
            sequencer.start();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    /**
     * 停止播放
     */
    public static void stop()
    {
        if (sequencer==null)
        {
            return;
        }
        sequencer.stop();
    }

    //for test
    public static void main(String[] args)
    {
        PlayMidi.loadMidi("sound/a16.mid");
        PlayMidi.play(true);
    }
}