Question

怎样在Java图形界面添加背景音乐

Answer 1

Java中可以通过AudioClip类来实现音乐播放，循环等操作。AudioClip支持的音乐格式有.wav、.mid、AIFF、AU、RMF，但是格式要求相当严格。我用AudioClip播放我自己录的一段wav文件就没有声音，让我纠结了很久，最后才发现我的wav文件内容没有写文件尾，对于格式要求严格的AudioClip而言是无法识别的（这个问题困扰了我整晚）。
AudioCLip主要的方法有：play()播放依次声音；loop()循环播放音乐；stop()停止播放。
做法一：

InputStream is =null;
AudioStream as = null ;
is = getClass().getResourceAsStream("a.wav");
try {
as = new AudioStream(is);
} catch (IOException e) {}
AudioPlayer.player.start(as);
此方法将音乐文件放入流中在播放，仅限于Java Application，容易报错，空指针异常，或者是流异常，不推荐。

做法二：
String music = "a.wav";
AudioClip clip = Applet.newAudioClip(getClass().getResource(music));
次方法在Applet中运行没有问题，但是Application中getclass()会返回空指针，导致失败。
推荐做法：
private URL url;
private AudioClip ac;
File f1 = new File("C:/3.wav");
try {
url= f1.toURL();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ac= Applet.newAudioClip(cb1);
ac.play();

Answer 2

import java.applet.*;
import java.awt.*;
..............
//创建图形界面
AudioClip clip=Applet.newAudioClip(路径URL);
clip.play(); //播放
/*
clip.stop(); 停止
clip.loop(); 循环播放
*/

还可以用javax.sound.sampled包

Answer 3

import java.io.IOException;
import java.net.URL;

import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Sequence;
import javax.sound.midi.Sequencer;

class MidiSequence {
private Sequencer sequencer;

//provide Sequence as a read-only property
private Sequence song;
public Sequence getSong() { return song; }

//filename property is read-only
private String filename;
public String getFilename() { return filename; }

//looping property
private boolean looping = false;
public boolean getLooping() { return looping; }
public void setLooping(boolean _looping) { looping = _looping; }

//repeat property
private int repeat = 0;
public void setRepeat(int _repeat) { repeat = _repeat; }
public int getRepeat() { return repeat; }

//returns whether the sequence is ready for action
public boolean isLoaded() {
return (boolean)(sequencer.isOpen());
}

//primary constructor
public MidiSequence() {
try {
//fire up the sequencer
sequencer = MidiSystem.getSequencer();
} catch (MidiUnavailableException e) { }
}

//overloaded constructor accepts a filename
public MidiSequence(String filename) {
//call default constructor
this();
//load the midi file
load(filename);
}

private URL getURL(String filename) {
URL url = null;
try {
url = this.getClass().getResource(filename);
}
catch (Exception e) { }
return url;
}

//load a midi file into a sequence
public boolean load(String midifile) {
try {

//load the midi file into the sequencer
filename = midifile;
song = MidiSystem.getSequence(getURL(filename));
sequencer.setSequence(song);
sequencer.open();
return true;

} catch (InvalidMidiDataException e) {
return false;
} catch (MidiUnavailableException e) {
return false;
} catch (IOException e) {
return false;
}
}

//play the midi sequence
public void play() {
if (!sequencer.isOpen()) return;

if (looping) {
sequencer.setLoopCount(Sequencer.LOOP_CONTINUOUSLY);
sequencer.start();
} else {
sequencer.setLoopCount(repeat);
sequencer.start();
}
}

//stop the midi sequence
public void stop() {
sequencer.stop();
}

}
public class myFrame extends JFrame{
public static void main(String []args){
this.setSize(500,500);
this.setTitle("my frame");
this.setVisible(true);
MidiSequence se=new MidiSequence ("music.wav");
se.play();
setLooping(true);

try{
Thread.sleep(10000);
}catch(Exception e){
}
se.stop();
}
}

Answer 4

陪楼主等答案