JavaFX | FileChooser Класс

Класс FileChooser является частью JavaFX. Он используется для вызова диалогов открытия файлов для выбора одного файла (showOpenDialog), диалогов открытия файлов для выбора нескольких файлов (showOpenMultipleDialog) и диалогов сохранения файлов (showSaveDialog). Класс FileChooser наследует класс Object.

Конструкторами класса являются:

• FileChooser () : создает новый диалог FileChooser.

Часто используемые методы:

Below programs illustrate the use of FileChooser Class:

1. Java Program to create fileChooser and add it to the stage: In this program we will create a file chooser named file_chooser. Then create a Label named label and two Buttons named button and button1. We will create two EventHandler to handle the events when the button or button1 pressed. When the button is pressed, an open file chooser dialog appears and the selected file is shown as text in the label and when button1 is pressed, a save file chooser appears and the selected file is shown as text in the label. Add the label and the button to Vbox and add the VBox to the Scene and add the scene to the stage, and call the show() function to display the final results.

   // Java Program to create fileChooser // and add it to the stage 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.scene.paint.*; import javafx.scene.canvas.*; import javafx.scene.text.*; import javafx.scene.Group; import javafx.scene.shape.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.collections.*; import java.io.*; import javafx.stage.FileChooser;     public class FileChooser_1 extends Application {     // launch the application public void start(Stage stage) {        try {            // set title for the stage         stage.setTitle("FileChooser");            // create a File chooser         FileChooser fil_chooser = new FileChooser();            // create a Label         Label label = new Label("no files selected");            // create a Button         Button button = new Button("Show open dialog");            // create an Event Handler         EventHandler<ActionEvent> event =          new EventHandler<ActionEvent>() {                public void handle(ActionEvent e)             {                    // get the file selected                 File file = fil_chooser.showOpenDialog(stage);                    if (file != null) {                                            label.setText(file.getAbsolutePath()                                          + "  selected");                 }             }         };            button.setOnAction(event);            // create a Button         Button button1 = new Button("Show save dialog");            // create an Event Handler         EventHandler<ActionEvent> event1 =           new EventHandler<ActionEvent>() {                public void handle(ActionEvent e)             {                    // get the file selected                 File file = fil_chooser.showSaveDialog(stage);                    if (file != null) {                     label.setText(file.getAbsolutePath()                                          + "  selected");                 }             }         };            button1.setOnAction(event1);            // create a VBox         VBox vbox = new VBox(30, label, button, button1);            // set Alignment         vbox.setAlignment(Pos.CENTER);            // create a scene         Scene scene = new Scene(vbox, 800, 500);            // set the scene         stage.setScene(scene);            stage.show();     }        catch (Exception e) {            System.out.println(e.getMessage());     } }    // Main Method public static void main(String args[]) {        // launch the application     launch(args); } }

   Output:

   

   

   

2. Java Program to create FileChooser, set title, initial File and add it to the stage: In this program we will create a file chooser named fil_chooser . Then create a Label named label and two Buttons named button and button1. Set the title and initial directory of file chooser using the setTitle() and setInitialDirectory() function. Now create two EventHandler to handle the events when the button or button1 pressed. When the button is pressed, an open file chooser dialog appears and the selected file is shown as text in the label and when button1 is pressed, a save file chooser appears and the selected file is shown as text in the label. Add the label and the button to Vbox and add the VBox to the Scene and add the scene to the stage, and call the show() function to display the final results.

   // Java Program to create FileChooser // & set title, initial File // and add it to the stage 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.scene.paint.*; import javafx.scene.canvas.*; import javafx.scene.text.*; import javafx.scene.Group; import javafx.scene.shape.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.collections.*; import java.io.*; import javafx.stage.FileChooser;     public class FileChooser_2 extends Application {    // launch the application public void start(Stage stage) {        try {            // set title for the stage         stage.setTitle("FileChooser");            // create a File chooser         FileChooser fil_chooser = new FileChooser();            // set title         fil_chooser.setTitle("Select File");            // set initial File         fil_chooser.setInitialDirectory(new File("e:\"));            // create a Label         Label label = new Label("no files selected");            // create a Button         Button button = new Button("Show open dialog");            // create an Event Handler         EventHandler<ActionEvent> event =          new EventHandler<ActionEvent>() {                public void handle(ActionEvent e)             {                    // get the file selected                 File file = fil_chooser.showOpenDialog(stage);                    if (file != null) {                     label.setText(file.getAbsolutePath()                                          + "  selected");                 }             }         };            button.setOnAction(event);            // create a Button         Button button1 = new Button("Show save dialog");            // create an Event Handler         EventHandler<ActionEvent> event1 =           new EventHandler<ActionEvent>() {                public void handle(ActionEvent e)             {                    // get the file selected                 File file = fil_chooser.showSaveDialog(stage);                    if (file != null) {                     label.setText(file.getAbsolutePath()                                          + "  selected");                 }             }         };            button1.setOnAction(event1);            // create a VBox         VBox vbox = new VBox(30, label, button, button1);            // set Alignment         vbox.setAlignment(Pos.CENTER);            // create a scene         Scene scene = new Scene(vbox, 800, 500);            // set the scene         stage.setScene(scene);            stage.show();     }        catch (Exception e) {            System.out.println(e.getMessage());     } }    // Main Method public static void main(String args[]) {        // launch the application     launch(args); } }

   Output:

   

   

   

Note: The above programs might not run in an online IDE please use an offline compiler.

Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/stage/FileChooser.html

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