连连看java程序 第6页

javaj连连看源代码
package kyodai;

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

/**
 * 控制背景音乐
 */
public class Music implements MetaEventListener, Runnable {
 private String midiFile = "sound/bg.mid";
 private Sequence sequence = null;
 private Sequencer sequencer;
 private boolean isPlaying = false;
 private volatile Thread thread;

 public Music() {
  try {
   loadMidi(midiFile);
  }
  catch (InvalidMidiDataException ex) {
  }
  catch (IOException ex) {
  }
 }

 /**
  * 读取midi文件
 */
 public void loadMidi(String filename)
  throws IOException,InvalidMidiDataException {

  URLClassLoader urlLoader = (URLClassLoader)this.getClass().getClassLoader();
  URL url = urlLoader.findResource(filename);
  sequence = MidiSystem.getSequence(url);
 }

 public void play() {
  if (isPlaying) { //如果已经在播放，返回
   return;
  }

  try {
   sequencer = MidiSystem.getSequencer();
   sequencer.open();
   sequencer.setSequence(sequence);

   sequencer.addMetaEventListener(this);
  }
  catch (InvalidMidiDataException ex) {
  }
  catch (MidiUnavailableException e) {
  }

  thread = new Thread(this);
  thread.start();
 }

 public void stop() {
  if (isPlaying) {
   sequencer.stop();
   isPlaying = false;
  }
  if (thread != null) {
   thread = null;
  }
 }

 public void run() {
  Thread currentThread = Thread.currentThread();
  while (currentThread == thread && !isPlaying) {
   sequencer.start();
   isPlaying = true;
   try {
    thread.sleep(1000l);
   }
   catch (InterruptedException ex) {
   }
  }
 }

 public void meta(MetaMessage event) {
  if (event.getType() == 47) {
   System.out.println("Sequencer is done playing.");
  } }
}

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