Javafx 简明教程

JavaFX - Playing Video

Video 是视觉沟通的一种媒介。在我们的日常生活中，我们可以在娱乐业、新闻机构、教育平台和许多其他领域看到它的应用。例如，我们可以在下图中看到 YouTube 视频播放器：

Video is a medium of visual communication. In our daily lives, we can observe its applications in various sectors such as the entertainment industry, news agencies, and educational platforms and many more. For example, we can see the YouTube video player in the below figure −

video sample

Playing Video in JavaFX

若要在 JavaFX 中播放视频，我们需要将其嵌入应用程序中。有不同的视频格式可用，其中 JavaFX 仅支持 MPEG-4 （简称 mp4）和 FLV 这两种格式。请按照下列步骤将视频嵌入 JavaFX 应用程序：

To play videos in JavaFX, we need to embed it within the application. There are different video formats available, out of which JavaFX supports only two namely MPEG-4(in short mp4) and FLV. Follow the steps given below to embed a video in JavaFX application −

  1. First, instantiate Media class of the package named javafx.scene.media by passing path of the video file.

  2. Next, create a MediaPlayer object by passing the Media object as a parameter value to its constructor.It will enable the media to be played in the JavaFX application.

  3. Then, instantiate MediaView class by passing the MediaPlayer object to its constructor as a parameter value. Doing so will allow JavaFX application to display the video.

  4. Lastly, create any layout pane and set the scene and stage with the desired dimension.

Example

以下 JavaFX 程序演示了如何将视频嵌入 JavaFX 应用程序中。将此代码保存到名为 Javafx_Video.java 的文件中。

The following JavaFX program demonstrates how to embed a Video into a JavaFX application. Save this code in a file with the name Javafx_Video.java.

import java.io.File;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.stage.Stage;
public class Javafx_Video extends Application {
   @Override
   public void start(Stage stage) {
      // Passing the video file to the File object
      File videofile = new File("sampleTP.mp4");
      // creating a Media object from the File Object
      Media videomedia = new Media(videofile.toURI().toString());
      // creating a MediaPlayer object from the Media Object
      MediaPlayer mdplayer = new MediaPlayer(videomedia);
      // creating a MediaView object from the MediaPlayer Object
      MediaView viewmedia = new MediaView(mdplayer);
      //setting the fit height and width of the media view
      viewmedia.setFitHeight(455);
      viewmedia.setFitWidth(500);
      // creating video controls using the buttons
      Button pause = new Button("Pause");
      Button resume = new Button("Resume");
      // creating an HBox
      HBox box = new HBox(20, pause, resume);
      box.setAlignment(Pos.CENTER);
      // function to handle play and pause buttons
      pause.setOnAction(act -> mdplayer.pause());
      resume.setOnAction(act -> mdplayer.play());
      // creating the root
      VBox root = new VBox(20);
      root.setAlignment(Pos.CENTER);
      root.getChildren().addAll(viewmedia, box);
      Scene scene = new Scene(root, 400, 400);
      stage.setScene(scene);
      stage.setTitle("Example of Video in JavaFX");
      stage.show();
   }
   public static void main(String[] args) {
      launch(args);
   }
}

要从命令提示符编译并执行已保存的 Java 文件，请使用以下命令−

To compile and execute the saved Java file from the command prompt, use the following commands −

javac --module-path %PATH_TO_FX% --add-modules javafx.controls,javafx.media Javafx_Video.java
java --module-path %PATH_TO_FX% --add-modules javafx.controls,javafx.media Javafx_Video

当我们执行上述代码时，它将生成以下输出。

When we execute the above code, it will generate the following output.

video example