Monday, December 28, 2015

Files.lines() read text file returned by JavaFX FileChooser

Example show how to read all lines from a file returned by JavaFX FileChooser, using Files.lines().


package javafxreadtextfile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFXReadTextFile extends Application {

    @Override
    public void start(Stage primaryStage) {
        Button btnLoad = new Button("Load");
        btnLoad.setOnAction(btnLoadEventListener);

        VBox rootBox = new VBox();
        rootBox.getChildren().add(btnLoad);
         
        Scene scene = new Scene(rootBox, 300, 300);
         
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    EventHandler<ActionEvent> btnLoadEventListener
    = (ActionEvent event) -> {
        FileChooser fileChooser = new FileChooser();
        fileChooser.getExtensionFilters()
            .addAll(
                new FileChooser.ExtensionFilter("TXT files (*.TXT)", "*.TXT"),
                new FileChooser.ExtensionFilter("txt files (*.txt)", "*.txt"));
        
        File file = fileChooser.showOpenDialog(null);
        if (file != null) {
            try {
                Files.lines(file.toPath()).forEach(System.out::println);
            } catch (IOException ex) {
                Logger.getLogger(JavaFXReadTextFile.class.getName())
                        .log(Level.SEVERE, null, ex);
            }
        }
    };

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


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