java提取wav的频谱

要提取WAV文件的频谱，可以使用Java中的Java Sound API和JavaFX中的Media类。下面是一个简单的代码示例：

import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaPlayer.Status;

public class SpectrogramExtractor {

  public static void main(String[] args) {
    String filename = "audio.wav";
    File file = new File(filename);
    if (!file.exists()) {
      System.err.println("File not found: " + filename);
      return;
    }
    try {
      AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file);
      AudioFileFormat fileFormat = AudioSystem.getAudioFileFormat(file);
      if (audioInputStream == null || fileFormat == null) {
        throw new UnsupportedAudioFileException();
      }
      Media media = new Media(file.toURI().toString());
      MediaPlayer mediaPlayer = new MediaPlayer(media);
      mediaPlayer.setOnReady(() -> {
        double duration = media.getDuration().toMillis();
        double position = 0;
        while (position < duration) {
          mediaPlayer.seek(new javafx.util.Duration(position));
          mediaPlayer.play();
          while (mediaPlayer.getStatus() == Status.PLAYING) {
            Thread.sleep(100);
          }
          position += 100;
        }
        mediaPlayer.dispose();
      });
      mediaPlayer.setOnError(() -> {
        System.err.println("Media player error: " + mediaPlayer.getError());
        mediaPlayer.dispose();
      });
      mediaPlayer.setOnStopped(() -> {
        mediaPlayer.dispose();
      });
      mediaPlayer.play();
    } catch (UnsupportedAudioFileException | IOException | InterruptedException e) {
      System.err.println("Error: " + e.getMessage());
    }
  }

}

这个代码会将WAV文件加载为一个JavaFX的Media对象，然后使用MediaPlayer来播放它。在播放过程中，代码会每100毫秒调用一次MediaPlayer的seek方法来更新播放位置，然后使用Thread.sleep方法等待MediaPlayer播放完成。在每个位置上，你可以使用Java Sound API来提取频谱。