JavaFX中是否有类似于returns一个文件的getSelectedFile的方法？

Question

JavaFX中有没有类似getSelectedFile的方法returns一个File？我已经尝试过这段代码，现在试图完善注释掉的 //fileToSend[0]

@FXML
private void chooseButtonAction(ActionEvent event) throws IOException {

    FileChooser JFileChooser = new FileChooser();
    JFileChooser.setTitle("Choose a file to send");
    
    Stage stage = (Stage) anchorPane.getScene().getWindow();
    File file = JFileChooser.showOpenDialog(stage);

    if (file != null) {
        //fileToSend[0] = JFileChooser.getSelectedFile();
        fileName.setText("File Name " + file.getName());
    }

}

Answer 1

Swing 组件JFileChooser offers getSelectedFile() and getSelectedFiles(), which returns an array "of selected files if the file chooser is set to allow multiple selection." In contrast, the JavaFX control FileChooser returns a single File from showOpenDialog(), and it returns a List<File> from showOpenMultipleDialog().

给定一个 FileChooser 实例，您可以像这样获取 selected 个文件的列表：

FileChooser fileChooser = new FileChooser();
List<File> selected = fileChooser.showOpenMultipleDialog(stage);

你可以这样获取第一个selected文件：

System.out.println(selected.get(0));

您可以像这样遍历它们：

selected.forEach(file -> System.out.println(file.getName() + " selected"));

下面的完整示例是基于这个相关的 example:

import java.io.File;
import java.util.List;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/** @see  */
public class FileChooserDemo extends Application {

    private static final int PADDING = 16;

    @Override
    public void start(Stage stage) {
        stage.setTitle("FileChooserDemo");
        FileChooser fileChooser = new FileChooser();
        Label label = new Label("Select one or more files:");
        TextArea textArea = new TextArea();
        textArea.setPrefColumnCount(16);
        textArea.setPrefRowCount(4);
        Button singleButton = new Button("Select a File");
        singleButton.setOnAction((ActionEvent t) -> {
            File file = fileChooser.showOpenDialog(stage);
            if (file != null) {
                textArea.clear();
                textArea.appendText(file.getName());
            }
        });
        Button multiButton = new Button("Select Files");
        multiButton.setOnAction((ActionEvent t) -> {
            List<File> selected = fileChooser.showOpenMultipleDialog(stage);
            if (selected != null) {
                textArea.clear();
                selected.forEach(file -> textArea.appendText(file.getName() + "\n"));
            }
        });
        VBox vBox = new VBox(PADDING, label, singleButton, multiButton, textArea);
        vBox.setAlignment(Pos.CENTER);
        vBox.setPadding(new Insets(PADDING));
        Scene scene = new Scene(vBox);
        stage.setScene(scene);
        stage.show();
    }

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

JavaFX中是否有类似于returns一个文件的getSelectedFile的方法？

Is there a method similar to getSelectedFile in JavaFX that returns a File?

java

swing

javafx

filechooser

fxml