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Introduction to JavaFX FileChooser

In JavaFX, FileChooser is a class that is used to browse the files from the system. Several operations include opening a single file, opening multiple files and saving files in the system. JavaFX file chooser is instantiated from the class javafx.stage.FileChooser. The syntax, states, constructors, and example of JavaFX FileChooser will be discussed in the following sections.

Syntax:

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FileChooser fl = new FileChooser();

Make sure the class javafx.stage.FileChooser is imported before writing the JavaFX program.

JavaFX FileChooser Constructors

There is only one constructor for JavaFX FileChooser. That is,

FileChooser(): A FileChooser dialog will be created

FileChooser fl = new FileChooser(); Methods of JavaFX FileChooser

Following are some of the commonly used methods in JavaFX FileChooser:

getTitle(): File chooser title will be returned.

setTitle(String s): File chooser title will be set.

getInitialDirectory(): File chooser’s initial directory will be returned.

setInitialDirector (file f ): File chooser’s initial directory will be set.

setInitialFileName(String s): File chooser’s initial file name will be set.

getInitialFileName(): File chooser’s initial file name will be returned.

showOpenDialog(Window wn ): A dialog appears with a new open file selection.

showSaveDialog(Window wn): A dialog appears with a new save file selection.

How to Create a FileChooser?

There are several steps to create a FileChooser.

Step 1: Create a FileChooser. In order to create a FileChooser, the following syntax can be used:

FileChooser fc = new FileChooser();

Step 2: Create the vertical Box. In this step, create a vertical box as follows.

VBox vb = new VBox();

Step 3: Add FileChooser created to the Scene Graph. After the creation of a vertical box, add the FileChooser to the scene graph using the below steps.

Scene sce = new Scene(vb, 300, 200); s.setScene(sce); s.show(); Program to Implement JavaFX FileChooser

Now, let us have a look into the implementation of the JavaFX file chooser:

Example #1

Java program to demonstrate FileChooser that browse the file location.

Code:

import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.control.TextField; import javafx.scene.layout.HBox; import javafx.stage.FileChooser; import javafx.stage.Stage; public class JavaFXfilechooserexample extends Application{ @Override public void start(Stage s) throws Exception { FileChooser f = new FileChooser(); f.setTitle("Opening the location.."); f.showOpenDialog(s); HBox r = new HBox(); r.setSpacing(20); Scene sc = new Scene(r,350,100); s.setScene(sc); s.setTitle("Sample file chooser"); s.show(); } public static void main(String[] args) { launch(args); } }

Output: A dialog box appears in which the user can select the location to browse any file they need. Also, it can be seen that a file title is displayed in the top left of the dialog box.

Example #2

The program that chooses a file and save it with the help of a button and an event handler.

Code:

import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.Stage; import javafx.geometry.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.collections.*; import java.io.*; import javafx.stage.FileChooser; import javafx.scene.paint.*; import javafx.scene.canvas.*; import javafx.scene.text.*; import javafx.scene.Group; import javafx.scene.shape.*; public class JavaFXfilechooserexample extends Application { public void start(Stage s) { s.setTitle("FileChooser Example"); FileChooser fc = new FileChooser(); fc.setTitle("Select the File you want . . ."); fc.setInitialDirectory(new File("e:\")); Label l = new Label("You didn't select any files"); Button b1 = new Button("Show dialog"); public void handle(ActionEvent e) { File file = fc.showOpenDialog(s); if (file != null) { l.setText("You have selected the file " +file.getAbsolutePath()); } } }; b1.setOnAction(ev); Button b2 = new Button("Show save dialog"); public void handle(ActionEvent e) { File file = fc.showSaveDialog(s); if (file != null) { l.setText("You have selected the file " +file.getAbsolutePath() ); } } }; b2.setOnAction(ev2); VBox vb = new VBox(30, l, b1, b2); vb.setAlignment(Pos.CENTER); Scene sc = new Scene(vb, 800, 500); s.setScene(sc); s.show(); } public static void main(String args[]) { launch(args); } }

Output:

A dialog box as shown below will appear on executing the code.

After selecting, there will be a change in the label of the dialog box.

It can be clearly seen that the label changes with the file name I have selected.

Conclusion

In JavaFX, File choosers are used to browsing and save single files and multiple files. Unlike others, it uses only a non-parameterized constructor. In this document, syntax, constructor, methods, and program to implement JavaFX File Chooser is clearly discussed.