用java写一个视频播放器的代码

这是一个基于JavaFX的简单视频播放器的代码：

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Slider;
import javafx.scene.layout.BorderPane;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.stage.Stage;
import javafx.util.Duration;

import java.io.File;

public class VideoPlayer extends Application {

    private final String MEDIA_URL = "file:///C:/video.mp4"; // 视频文件的路径
    private final DoubleProperty rateProperty = new SimpleDoubleProperty(1.0); // 播放速度
    private final DoubleProperty volumeProperty = new SimpleDoubleProperty(0.5); // 音量

    @Override
    public void start(Stage primaryStage) throws Exception {
        // 加载视频文件
        Media media = new Media(MEDIA_URL);
        MediaPlayer mediaPlayer = new MediaPlayer(media);
        mediaPlayer.setAutoPlay(true);

        // 创建MediaView用于显示视频
        MediaView mediaView = new MediaView(mediaPlayer);

        // 创建Slider用于控制播放进度
        Slider timeSlider = new Slider();
        timeSlider.setMin(0);
        mediaPlayer.setOnReady(() -> {
            timeSlider.setMax(mediaPlayer.getTotalDuration().toSeconds());
        });
        mediaPlayer.currentTimeProperty().addListener((observable, oldValue, newValue) -> {
            timeSlider.setValue(newValue.toSeconds());
        });
        timeSlider.setOnMouseClicked(event -> {
            mediaPlayer.seek(Duration.seconds(timeSlider.getValue()));
        });

        // 创建Slider用于控制音量
        Slider volumeSlider = new Slider();
        volumeSlider.setMin(0);
        volumeSlider.setMax(1);
        mediaPlayer.volumeProperty().bindBidirectional(volumeProperty);
        volumeSlider.valueProperty().bindBidirectional(volumeProperty);

        // 创建Button用于播放/暂停视频
        Button playButton = new Button("播放");
        playButton.setOnAction(event -> {
            if (mediaPlayer.getStatus() == MediaPlayer.Status.PLAYING) {
                mediaPlayer.pause();
                playButton.setText("播放");
            } else {
                mediaPlayer.play();
                playButton.setText("暂停");
            }
        });

        // 创建Button用于停止视频
        Button stopButton = new Button("停止");
        stopButton.setOnAction(event -> {
            mediaPlayer.stop();
            playButton.setText("播放");
        });

        // 创建Slider用于控制播放速度
        Slider rateSlider = new Slider(0.5, 1.5, 1.0);
        mediaPlayer.rateProperty().bindBidirectional(rateProperty);
        rateSlider.valueProperty().bindBidirectional(rateProperty);

        // 创建布局
        BorderPane pane = new BorderPane();
        pane.setCenter(mediaView);
        pane.setBottom(timeSlider);
        BorderPane.setMargin(timeSlider, new javafx.geometry.Insets(10, 0, 0, 0));
        pane.setLeft(volumeSlider);
        BorderPane.setMargin(volumeSlider, new javafx.geometry.Insets(0, 0, 0, 10));
        pane.setTop(playButton);
        BorderPane.setAlignment(playButton, javafx.geometry.Pos.CENTER);
        pane.setRight(rateSlider);
        BorderPane.setMargin(rateSlider, new javafx.geometry.Insets(0, 10, 0, 0));
        pane.setBottom(stopButton);
        BorderPane.setAlignment(stopButton, javafx.geometry.Pos.CENTER_RIGHT);
        BorderPane.setMargin(stopButton, new javafx.geometry.Insets(0, 0, 10, 10));

        // 创建场景
        Scene scene = new Scene(pane, 640, 480);

        // 设置舞台
        primaryStage.setScene(scene);
        primaryStage.setTitle("视频播放器");
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

注意：这个代码需要将`MEDIA_URL`替换为你自己的视频文件路径。另外，需要在项目中添加JavaFX库的依赖，具体方法可以参考官方文档。