JavaFX 16. FileChooser

1. Main.java

package application;
    
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.fxml.FXMLLoader;
 
 
public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("Sample.fxml"));
            Scene scene = new Scene(root);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

2. Sample.fxml

<?xml version="1.0" encoding="UTF-8"?>
 
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.layout.AnchorPane?>
 
 
<AnchorPane prefHeight="500.0" prefWidth="500.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.60" fx:controller="application.SampleController">
   <children>
      <Button fx:id="btn1" layoutX="56.0" layoutY="117.0" mnemonicParsing="false" onAction="#Button1Action" text="Select One File" />
      <Button fx:id="btn2" layoutX="53.0" layoutY="173.0" mnemonicParsing="false" onAction="#Button2Action" text="Select Multi File" />
      <ListView fx:id="listView" layoutX="218.0" layoutY="21.0" prefHeight="449.0" prefWidth="258.0" />
   </children>
</AnchorPane>
 

3. SampleController.java

package application;
 
import java.io.File;
import java.util.List;
 
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.stage.FileChooser;
import javafx.stage.FileChooser.ExtensionFilter;
 
public class SampleController {
    @FXML
    private Button btn1;
    @FXML
    private Button btn2;
    @FXML
    private ListView listView;
    
    public void Button1Action(ActionEvent event){
        FileChooser fc = new FileChooser();
        fc.setInitialDirectory(new File ("C:/Temp"));
        fc.getExtensionFilters().addAll(new ExtensionFilter("png files","*.png"));
        File selectedFile = fc.showOpenDialog(null);
        if(selectedFile != null){
            listView.getItems().add(selectedFile.getAbsolutePath());
        } else {
            System.out.println("File is not valid");
        }
    }
    
    public void Button2Action(ActionEvent event){
        FileChooser fc = new FileChooser();
        fc.setInitialDirectory(new File ("C:/Temp"));
        fc.getExtensionFilters().addAll(new ExtensionFilter("png files","*.png"));
        List<File> selectedFiles = fc.showOpenMultipleDialog(null);
        if(selectedFiles != null){
            for (int i = 0; i < selectedFiles.size(); i++) {
                listView.getItems().add(selectedFiles.get(i).getAbsolutePath());
            }
            
        } else {
            System.out.println("File is not valid");
        }
    }
}