1

オーディオのスペクトルを表示する次のコードがありますが、URI を使用しています。ローカルパスを使用すると例外が発生します：

Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
        at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
        at com.sun.javafx.application.LauncherImpl.access$000(Unknown Source)
        at com.sun.javafx.application.LauncherImpl$1.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:722)

コード：

package chartaudiobar;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.stage.Stage;


public class ChartAudioBar extends Application {

    private XYChart.Data<String, Number>[] series1Data;
    private AudioSpectrumListener audioSpectrumListener;

    private static final String AUDIO_URI = System.getProperty("demo.audio.url","http://download.oracle.com/otndocs/products/javafx/oow2010-2.flv");
    private static MediaPlayer audioMediaPlayer;
    private static final boolean PLAY_AUDIO = Boolean.parseBoolean(System.getProperty("demo.play.audio","true"));

    private void init(Stage primaryStage) {
        Group root = new Group();
        primaryStage.setScene(new Scene(root));
        root.getChildren().add(createChart());
        audioSpectrumListener = new AudioSpectrumListener() {
            @Override public void spectrumDataUpdate(double timestamp, double duration,
                    float[] magnitudes, float[] phases) {
                for (int i = 0; i < series1Data.length; i++) {
                    series1Data[i].setYValue(magnitudes[i] + 60);
                }
            }
        };
    }

    public void play() {
        this.startAudio();
    }

    @Override public void stop() {
        this.stopAudio();
    }

    protected BarChart<String, Number> createChart() {
        final CategoryAxis xAxis = new CategoryAxis();
        final NumberAxis yAxis = new NumberAxis(0,50,10);
        final BarChart<String,Number> bc = new BarChart<String,Number>(xAxis,yAxis);
        bc.setId("barAudioDemo");
        bc.setLegendVisible(false);
        bc.setAnimated(false);
        bc.setBarGap(0);
        bc.setCategoryGap(1);
        bc.setVerticalGridLinesVisible(false);
        // setup chart
        bc.setTitle("Live Audio Spectrum Data");
        xAxis.setLabel("Frequency Bands");
        yAxis.setLabel("Magnitudes");
        yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis,null,"dB"));
        // add starting data
        XYChart.Series<String,Number> series1 = new XYChart.Series<String,Number>();
        series1.setName("Data Series 1");
        //noinspection unchecked
        series1Data = new XYChart.Data[128];
        String[] categories = new String[128];
        for (int i=0; i<series1Data.length; i++) {
            categories[i] = Integer.toString(i+1);
            series1Data[i] = new XYChart.Data<String,Number>(categories[i],50);
            series1.getData().add(series1Data[i]);
        }
        bc.getData().add(series1);
        return bc;
    }

     private void startAudio() {
        if (PLAY_AUDIO) {
            getAudioMediaPlayer().setAudioSpectrumListener(audioSpectrumListener);
            getAudioMediaPlayer().play();
        }
    }

    private void stopAudio() {
        if (getAudioMediaPlayer().getAudioSpectrumListener() == audioSpectrumListener) {
            getAudioMediaPlayer().pause();
        }
    }

    private static MediaPlayer getAudioMediaPlayer() {
        if (audioMediaPlayer == null) {
            Media audioMedia = new Media(AUDIO_URI);
            audioMediaPlayer = new MediaPlayer(audioMedia);
        }
        return audioMediaPlayer;
    }


    @Override public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();
        play();
    }
    public static void main(String[] args) { launch(args); }
}

では、ここでローカル パスを使用するにはどうすればよいでしょうか。

4

3 に答える 3

1

プロトコルを追加することでパスをURIに変換できます

C：/abc/asas.wavはfile：/ C：/abc/asas.wavになりますあなたの例では

于 2013-03-06T14:13:42.477 に答える