Java 音頻播放完整方案：javax.sound.sampled 低層與 sun.audio 簡易封裝

方案一：標準 API javax.sound.sampled（推薦）

支援 WAV、AIFF、AU 等非壓縮格式；MP3 需外掛 SPI（如 JLayer、Tritonus）。

public class AudioPlayer extends Thread {
    private final String filePath;

    public AudioPlayer(String path) { this.filePath = path; }

    @Override public void run() {
        try (AudioInputStream ais = AudioSystem.getAudioInputStream(new File(filePath))) {
            AudioFormat fmt = ais.getFormat();
            DataLine.Info info = new DataLine.Info(SourceDataLine.class, fmt);
            try (SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info)) {
                line.open(fmt);
                line.start();
                byte[] buf = new byte[4096];
                int n;
                while ((n = ais.read(buf)) != -1) line.write(buf, 0, n);
                line.drain();
            }
        } catch (Exception e) { e.printStackTrace(); }
    }
}
// 使用：new AudioPlayer("sound.wav").start();

方案二：sun.audio 簡易封裝（內部 API，不保證長期相容）

public class MusicPlay {
    private AudioStream as;
    private ContinuousAudioDataStream loop;

    public MusicPlay(URL url) {
        try { as = new AudioStream(url.openStream()); } catch (IOException e) { e.printStackTrace(); }
    }
    public void start() { if (as != null) AudioPlayer.player.start(as); }
    public void stop()  { if (as != null) AudioPlayer.player.stop(as); }
    public void loopStart() {
        try { loop = new ContinuousAudioDataStream(as.getData()); AudioPlayer.player.start(loop); }
        catch (IOException e) { e.printStackTrace(); }
    }
    public void loopStop() { if (loop != null) AudioPlayer.player.stop(loop); }
}

關鍵差異對比

生產級建議

• 短音效（UI 點擊、提示）：預載 Clip，clip.setFramePosition(0); clip.start();
• 長音樂/背景音：SourceDataLine 串流播放，避免佔用大量堆記憶體
• MP3/OGG：引入 JLayer (MP3SPI) 或 Tritonus，或使用 JavaFX MediaPlayer（含解碼器）
• 多執行緒安全：Clip/SourceDataLine 非執行緒安全，單執行緒操作或加鎖

JavaFX MediaPlayer 範例（現代首選）

Media media = new Media(new File("song.mp3").toURI().toString());
MediaPlayer player = new MediaPlayer(media);
player.setOnReady(() -> player.play());
player.setCycleCount(MediaPlayer.INDEFINITE); // 循環
// JavaFX 需獨立模組 java.media，JDK 11+ 需額外引入