初学了一段时间Java。想做一个应用程序，程序只需要播放一个本地视频,MP4格式，求教怎么做
3个回答
展开全部
使用javafx的Media，MediaPlayer，MediaView。代码如下：
import java.io.File;
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.ReadOnlyProperty;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.control.Slider;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaPlayer.Status;
import javafx.scene.media.MediaView;
import javafx.stage.FileChooser;
import javafx.stage.FileChooser.ExtensionFilter;
import javafx.stage.Stage;
import javafx.util.Duration;
public class App extends Application {
private MediaView mediaView;
private Slider processSlider;
private static final Object AUTO = new Object(), MANUAL = new Object();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setTitle("javafx视频播放器");
BorderPane root = new BorderPane();
// 菜单栏
initMenu(root);
// 视频播放控件
mediaView = initMediaView(root);
// 视频功能控件
initMediaControllView(root);
primaryStage.setScene(new Scene(root, 600, 400));
primaryStage.setOnCloseRequest(event -> System.exit(0));
primaryStage.show();
}
private MenuBar initMenu(final BorderPane parent) {
Menu menu = new Menu("菜单");
MenuItem item = new MenuItem("打开");
item.setOnAction(event -> {
FileChooser chooser = new FileChooser();
chooser.setTitle("选择视频文件");
chooser.getExtensionFilters().add(new ExtensionFilter("视频文件", "*.mp4", "*.flv"));
File file = chooser.showOpenDialog(parent.getScene().getWindow());
if (file != null) {
MediaPlayer player = mediaView.getMediaPlayer();
// 关闭当前的player
if (player != null) {
player.stop();
player.dispose();
}
processSlider.setValue(0);
// 创建一个新的player并自动播放
player = new MediaPlayer(new Media(file.toURI().toString()));
player.currentTimeProperty().addListener(this::mediaProcessChanged);
player.setAutoPlay(true);
mediaView.setMediaPlayer(player);
}
});
menu.getItems().add(item);
item = new MenuItem("退出");
item.setOnAction(event -> parent.getScene().getWindow().hide());
menu.getItems().add(item);
MenuBar menuBar = new MenuBar(menu);
parent.setTop(menuBar);
return menuBar;
}
private MediaView initMediaView(final BorderPane parent) {
MediaView view = new MediaView();
Pane pane = new Pane(view);
parent.setCenter(pane);
// 视频宽高可随着窗口变化而自动缩放
view.fitWidthProperty().bind(Bindings.selectDouble(view.parentProperty(), "width"));
view.fitHeightProperty().bind(Bindings.selectDouble(view.parentProperty(), "height"));
view.setPreserveRatio(true);
return view;
}
private void initMediaControllView(final BorderPane parent) {
VBox bottom = new VBox(10);
bottom.setAlignment(Pos.CENTER);
parent.setBottom(bottom);
Slider slider = new Slider(0, 100, 0);
slider.valueProperty().addListener(this::processSliderChanged);
// slider.setOnMouseClicked(this::processSliderClicked);
bottom.getChildren().add(slider);
processSlider = slider;
HBox hbox = new HBox(10);
bottom.getChildren().add(hbox);
hbox.setAlignment(Pos.CENTER);
Button btn = new Button(null, new ImageView(loadImage("pause.png")));
btn.setOnAction(this::pauseOrPlay);
hbox.getChildren().add(btn);
btn = new Button(null, new ImageView(loadImage("stop.png")));
btn.setOnAction(this::stopPlay);
hbox.getChildren().add(btn);
}
private static Image loadImage(String resPath) {
return new Image(Thread.currentThread().getContextClassLoader().getResourceAsStream(resPath));
}
private void pauseOrPlay(ActionEvent event) {
MediaPlayer player = mediaView.getMediaPlayer();
if (player == null) {
return;
}
Status status = player.getStatus();
if (status == Status.READY || status == Status.PAUSED) {
player.play();
((Button) event.getTarget()).setGraphic(new ImageView(loadImage("pause.png")));
} else if (status == Status.PLAYING) {
player.pause();
((Button) event.getTarget()).setGraphic(new ImageView(loadImage("play.png")));
}
}
private void stopPlay(ActionEvent event) {
MediaPlayer player = mediaView.getMediaPlayer();
if (player == null) {
return;
}
player.stop();
}
// private void processSliderClicked(MouseEvent event) {
// Slider slider = (Slider) event.getSource();
// if (mediaView.getMediaPlayer() != null) {
// Duration d = mediaView.getMediaPlayer().getTotalDuration().multiply(slider.getValue() / slider.getMax());
// mediaView.getMediaPlayer().seek(d);
// }
// }
private void processSliderChanged(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
Slider slider = (Slider) ((ReadOnlyProperty<? extends Number>) observable).getBean();
if (slider.getUserData() == AUTO) { // 进度条是自动改变的，因此不用设置播放器
slider.setUserData(null);
return;
}
if (mediaView.getMediaPlayer() != null) {
slider.setUserData(MANUAL);
Duration d = mediaView.getMediaPlayer().getTotalDuration().multiply(newValue.doubleValue() / slider.getMax());
mediaView.getMediaPlayer().seek(d);
}
}
private void mediaProcessChanged(ObservableValue<? extends Duration> observable, Duration oldValue, Duration newValue) {
if (processSlider.getUserData() == MANUAL) { // 手动点击进度条
processSlider.setUserData(null);
return;
}
MediaPlayer player = (MediaPlayer) ((ReadOnlyProperty<? extends Duration>) observable).getBean();
processSlider.setUserData(AUTO);
processSlider.setValue(newValue.toMillis() / player.getTotalDuration().toMillis() * 100);
}
}
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