如何使用java显示视频？

Question

我正在尝试使用javax.mediaplayer播放.avi格式的视频，这是方法

void open() {
    // create a file chooser
    JFileChooser fileChooser = new JFileChooser();

    // show open file dialog
    int result = fileChooser.showOpenDialog(null);

    if (result == JFileChooser.APPROVE_OPTION) // user chose a file
    {
        URL mediaURL = null;

        try {
            // get the file as URL
            mediaURL = fileChooser.getSelectedFile().toURL();
        } // end try
        catch (MalformedURLException malformedURLException) {
            System.err.println("Could not create URL for the file");
        } // end catch

        if (mediaURL != null) // only display if there is a valid URL
        {
            JFrame mediaTest = new JFrame("Media Tester");
            mediaTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            MediaPlayer mediaPanel = new MediaPlayer();
            mediaPanel.setMediaLocator(new MediaLocator(mediaURL));

            mediaTest.add(mediaPanel);

            mediaTest.setSize(300, 300);
            mediaTest.setVisible(true);
        } // end inner if
    } // end outer if
}

问题是每当我运行时，它运行成功并且jframe弹出但是空了，里面没有视频,,,任何帮助？