和其他的接口组件不同，FileChooser 不属于javafx.scene.controls包，FileChooser 类在javafx.stage 包下，和其他主要的图形元素在一起，比如：Stage，Window，以及Popup。
FileChooser提供了一个典型的界面功能：文件系统导航。
文件选择器经常用来打开一个窗口来选择文件或者保存文件，最简单是文件选择器的使用如下面代码所示：
FileChooser fileChooser = new FileChooser();fileChooser.setTitle("Open Resource File");fileChooser.showOpenDialog(stage);FileChooser最常用的还是让我们点击一个按钮后弹出文件选择器，看下面这个例子：
import java.awt.Desktop;import java.awt.EventQueue;import java.io.File;import java.io.IOException;import java.util.List;import java.util.logging.Level;import java.util.logging.Logger;import javafx.application.Application;import javafx.event.ActionEvent;import javafx.geometry.Insets;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.layout.GridPane;import javafx.scene.layout.Pane;import javafx.scene.layout.VBox;import javafx.stage.FileChooser;import javafx.stage.Stage;public final class FileChooserSample extends Application { private final Desktop desktop = Desktop.getDesktop(); @Override public void start(final Stage stage) { stage.setTitle("File Chooser Sample"); final FileChooser fileChooser = new FileChooser(); final Button openButton = new Button("Open a Picture..."); final Button openMultipleButton = new Button("Open Pictures..."); openButton.setOnAction( (final ActionEvent e) -> { File file = fileChooser.showOpenDialog(stage); if (file != null) { openFile(file); } }); openMultipleButton.setOnAction( (final ActionEvent e) -> { List<File> list = fileChooser.showOpenMultipleDialog(stage); if (list != null) { list.stream().forEach((file) -> { openFile(file); }); } }); final GridPane inputGridPane = new GridPane(); GridPane.setConstraints(openButton, 0, 0); GridPane.setConstraints(openMultipleButton, 1, 0); inputGridPane.setHgap(6); inputGridPane.setVgap(6); inputGridPane.getChildren().addAll(openButton, openMultipleButton); final Pane rootGroup = new VBox(12); rootGroup.getChildren().addAll(inputGridPane); rootGroup.setPadding(new Insets(12, 12, 12, 12)); stage.setScene(new Scene(rootGroup)); stage.show(); } public static void main(String[] args) { Application.launch(args); } private void openFile(File file) { EventQueue.invokeLater(() -> { try { desktop.open(file); } catch (IOException ex) { Logger.getLogger(FileChooserSample. class.getName()). log(Level.SEVERE, null, ex); } }); }}在该例子中，Open a Picture按钮用来打开一个可以选择一个图片的文件选择器，Open Pictures 按钮可以打开一个可以选择多个图片的文件选择器，setOnAction 方法定义了它们打开按钮的方式。
代码运行效果如图：
在下面的例子调用了initialDirectory 方法来初始化路径，以及设置title属性。
import java.awt.Desktop;import java.awt.EventQueue;import java.io.File;import java.io.IOException;import java.util.List;import java.util.logging.Level;import java.util.logging.Logger;import javafx.application.Application;import javafx.event.ActionEvent;import javafx.geometry.Insets;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.layout.GridPane;import javafx.scene.layout.Pane;import javafx.scene.layout.VBox;import javafx.stage.FileChooser;import javafx.stage.Stage;public final class FileChooserSample extends Application { private final Desktop desktop = Desktop.getDesktop(); @Override public void start(final Stage stage) { stage.setTitle("File Chooser Sample"); final FileChooser fileChooser = new FileChooser(); final Button openButton = new Button("Open a Picture..."); final Button openMultipleButton = new Button("Open Pictures..."); openButton.setOnAction( (final ActionEvent e) -> { configureFileChooser(fileChooser); File file = fileChooser.showOpenDialog(stage); if (file != null) { openFile(file); } }); openMultipleButton.setOnAction( (final ActionEvent e) -> { configureFileChooser(fileChooser); List<File> list = fileChooser.showOpenMultipleDialog(stage); if (list != null) { list.stream().forEach((file) -> { openFile(file); }); } }); final GridPane inputGridPane = new GridPane(); GridPane.setConstraints(openButton, 0, 0); GridPane.setConstraints(openMultipleButton, 1, 0); inputGridPane.setHgap(6); inputGridPane.setVgap(6); inputGridPane.getChildren().addAll(openButton, openMultipleButton); final Pane rootGroup = new VBox(12); rootGroup.getChildren().addAll(inputGridPane); rootGroup.setPadding(new Insets(12, 12, 12, 12)); stage.setScene(new Scene(rootGroup)); stage.show(); } public static void main(String[] args) { Application.launch(args); } private static void configureFileChooser(final FileChooser fileChooser){ fileChooser.setTitle("View Pictures"); fileChooser.setInitialDirectory( new File(System.getProperty("user.home")) ); } private void openFile(File file) { EventQueue.invokeLater(() -> { try { desktop.open(file); } catch (IOException ex) { Logger.getLogger(FileChooserSample. class.getName()). log(Level.SEVERE, null, ex); } }); }}import java.awt.Desktop;import java.awt.EventQueue;import java.io.File;import java.io.IOException;import java.util.List;import java.util.logging.Level;import java.util.logging.Logger;import javafx.application.Application;import javafx.event.ActionEvent;import javafx.geometry.Insets;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.layout.GridPane;import javafx.scene.layout.Pane;import javafx.scene.layout.VBox;import javafx.stage.FileChooser;import javafx.stage.Stage;public final class FileChooserSample extends Application { private final Desktop desktop = Desktop.getDesktop(); @Override public void start(final Stage stage) { stage.setTitle("File Chooser Sample"); final FileChooser fileChooser = new FileChooser(); final Button openButton = new Button("Open a Picture..."); final Button openMultipleButton = new Button("Open Pictures..."); openButton.setOnAction( (final ActionEvent e) -> { configureFileChooser(fileChooser); File file = fileChooser.showOpenDialog(stage); if (file != null) { openFile(file); } }); openMultipleButton.setOnAction( (final ActionEvent e) -> { configureFileChooser(fileChooser); List<File> list = fileChooser.showOpenMultipleDialog(stage); if (list != null) { list.stream().forEach((file) -> { openFile(file); }); } }); final GridPane inputGridPane = new GridPane(); GridPane.setConstraints(openButton, 0, 1); GridPane.setConstraints(openMultipleButton, 1, 1); inputGridPane.setHgap(6); inputGridPane.setVgap(6); inputGridPane.getChildren().addAll(openButton, openMultipleButton); final Pane rootGroup = new VBox(12); rootGroup.getChildren().addAll(inputGridPane); rootGroup.setPadding(new Insets(12, 12, 12, 12)); stage.setScene(new Scene(rootGroup)); stage.show(); } public static void main(String[] args) { Application.launch(args); } private static void configureFileChooser( final FileChooser fileChooser) { fileChooser.setTitle("View Pictures"); fileChooser.setInitialDirectory( new File(System.getProperty("user.home")) ); fileChooser.getExtensionFilters().addAll( new FileChooser.ExtensionFilter("All Images", "*.*"), new FileChooser.ExtensionFilter("JPG", "*.jpg"), new FileChooser.ExtensionFilter("PNG", "*.png") ); } private void openFile(File file) { EventQueue.invokeLater(() -> { try { desktop.open(file); } catch (IOException ex) { Logger.getLogger(FileChooserSample. class.getName()). log(Level.SEVERE, null, ex); } }); }}上面的代码使用FileChooser.ExtensionFilter来设置了一个extension filter，它定义了这些文件类型是可以选择的：所有的图片文件、JPG和PNG。
当你编译、运行上面的代码时，点击其中的一个按钮，对应的扩展名过滤器将会出现在文件选择框窗体中。如果一个用户选择了JPG，那么在文件选择框中将会仅显示JPG类型的图片。
运行效果如图：
除了打开和过滤文件之外，FileChooser 还提供了保存文件的能力。
FileChooser fileChooser = new FileChooser();File file = fileChooser.showSaveDialog(stage);if(file != null){ //将要写入的内容写到file文件中}FileChooser类的showSaveDialog方法会打开一个保存对话框窗体。与其他展示对话框的方法一样，showSaveDialog方法返回了被用户选择的文件或者当没有作出选择时返回null。
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