Write a program in JavaFx that displays a text file in a text area, as shown in

Question

Write a program in JavaFx that displays a text file in a text area, as shown in Figure 17.20a. The user enters a file name in a text field and clicks the View button; the file is then displayed in a text area of a scrollPane.

Hint:

This code block will get the file name from a text area, read the file line by line will writing to the scollPane/text area.

try{

String S = FileLocation.getText().trim;

Scanner SelectedFile = new Scanner(new File(S) );

while(SelectedFile.hasNext()) {

String 1 = SelectedFile.nextLine();

Files.append(1 + " ";

}

}

Explanation / Answer

package javafxfilechooser;

import java.io.*;

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.Group;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.ScrollPane;

import javafx.scene.control.TextArea;

import javafx.scene.control.TextAreaBuilder;

import javafx.scene.layout.VBox;

import javafx.scene.layout.VBoxBuilder;

import javafx.stage.FileChooser;

import javafx.stage.Stage;

/**

*

*/

public class JavaFX_OpenFile extends Application {

    /**

     * @param args the command line arguments

     */

    public static void main(String[] args) {

        launch(args);

    }

    @Override

    public void start(final Stage primaryStage) {

        primaryStage.setTitle("java-buddy.blogspot.com");

        Group root = new Group();

        final TextArea textArea = TextAreaBuilder.create()

                .prefWidth(400)

                .wrapText(true)

                .build();

        ScrollPane scrollPane = new ScrollPane();

        scrollPane.getStyleClass().add("noborder-scroll-pane");

        scrollPane.setContent(textArea);

        scrollPane.setFitToWidth(true);

        scrollPane.setPrefWidth(400);

        scrollPane.setPrefHeight(180);

        Button buttonLoad = new Button("Load");

        buttonLoad.setOnAction(new EventHandler<ActionEvent>(){

            @Override

            public void handle(ActionEvent arg0) {

                FileChooser fileChooser = new FileChooser();

                //Set extension filter

                FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("TXT files (*.txt)", "*.txt");

                fileChooser.getExtensionFilters().add(extFilter);

                //Show save file dialog

                File file = fileChooser.showOpenDialog(primaryStage);

                if(file != null){

                    textArea.setText(readFile(file));

                }

            }

        });

        VBox vBox = VBoxBuilder.create()

                .children(buttonLoad, scrollPane)

                .build();

        root.getChildren().add(vBox);

        primaryStage.setScene(new Scene(root, 500, 400));

        primaryStage.show();

    }

    private String readFile(File file){

        StringBuilder stringBuffer = new StringBuilder();

        BufferedReader bufferedReader = null;

        try {

            bufferedReader = new BufferedReader(new FileReader(file));

            String text;

            while ((text = bufferedReader.readLine()) != null) {

                stringBuffer.append(text);

            }

        } catch (FileNotFoundException ex) {

            Logger.getLogger(JavaFX_OpenFile.class.getName()).log(Level.SEVERE, null, ex);

        } catch (IOException ex) {

            Logger.getLogger(JavaFX_OpenFile.class.getName()).log(Level.SEVERE, null, ex);

        } finally {

            try {

                bufferedReader.close();

            } catch (IOException ex) {

                Logger.getLogger(JavaFX_OpenFile.class.getName()).log(Level.SEVERE, null, ex);

            }

        }

        return stringBuffer.toString();

    }

}

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