JavaFX 2 und Internationalisierung

Question

Ich habe gerade mit dem Schreiben meiner ersten JavaFX 2-Anwendung angefangen, nachdem ich die Grundlagen gelernt habe und möchte sie internationalisieren.

Ich stelle fest, dass in JavaFX 1.x die Skriptsprache eine sehr einfache Internationalisierung von Strings erlaubt. Gibt es ähnliche Funktionen in JavaFX 2?

Grundsätzlich: Was ist die beste Vorgehensweise für die Internationalisierung einer JavaFX 2-Anwendung?

Answer 1

Die grundlegenden Schritte (unter anderem) einer Java-App Internationalisierung sind Locale Lizing und Ressourcenbündelung. In JavaFX können Sie FXMLLoader#setResources() für diese Zwecke verwenden. Hier eine SSCCE-Demo, um es zu demonstrieren. Die Codes sind selbstbeschreibend.
Demo Paketstruktur:

bundledemo 
    |------ BundleDemo.java 
    |------ MyController.java 
    |------ MyView.fxml 
bundles 
    |------ MyBundle_en.properties 
    |------ MyBundle_kg.properties 

MyBundle_en.properties

key1=Name Surname 
key2=How are you? 

MyBundle_kg.properties

key1=Aты Жөнү 
key2=Кандайсың? 

MyView.fxml

<?xml version="1.0" encoding="UTF-8"?> 

<?import javafx.scene.layout.*?> 
<?import javafx.scene.control.*?> 
<?import javafx.scene.*?> 

<BorderPane fx:controller="bundledemo.MyController" xmlns:fx="http://javafx.com/fxml"> 
    <top> 
     <!-- This label's text will be set by the controller --> 
     <Label fx:id="lblTextByController"/> 
    </top> 
    <center> 
     <!-- This label's text will be taken from the bundle automatically --> 
     <Label text="%key2"/> 
    </center> 
</BorderPane> 

MyCo ntroller.java

package bundledemo; 

import java.net.URL; 
import java.util.ResourceBundle; 
import javafx.fxml.FXML; 
import javafx.fxml.Initializable; 
import javafx.scene.control.Label; 

public class MyController implements Initializable { 

    @FXML private Label lblTextByController; 
    private ResourceBundle bundle; 

    @Override 
    public void initialize(URL location, ResourceBundle resources) { 
     bundle = resources; 
     lblTextByController.setText(bundle.getString("key1")); 
    } 
} 

BundleDemo.java

package bundledemo; 
// imports are ignored. 

public class BundleDemo extends Application { 

    private Stage stage; 

    @Override 
    public void start(Stage primaryStage) { 
     stage = primaryStage; 
     Button btnEN = new Button(); 
     btnEN.setText("English"); 
     btnEN.setOnAction(new EventHandler<ActionEvent>() { 
      @Override public void handle(ActionEvent event) { 
       loadView(new Locale("en", "EN")); 
      } 
     }); 

     Button btnKG = new Button(); 
     btnKG.setText("Kyrgyz"); 
     btnKG.setOnAction(new EventHandler<ActionEvent>() { 
      @Override public void handle(ActionEvent event) { 
       loadView(new Locale("kg", "KG")); 
      } 
     }); 

     VBox root = new VBox(20); 
     root.getChildren().add(HBoxBuilder.create().spacing(10).style("-fx-background-color: gray").padding(new Insets(5)).children(btnEN, btnKG).build()); 
     root.getChildren().add(new StackPane()); 
     primaryStage.setScene(new Scene(root, 300, 250)); 
     primaryStage.show(); 
    } 

    private void loadView(Locale locale) { 
     try { 
      FXMLLoader fxmlLoader = new FXMLLoader(); 
      fxmlLoader.setResources(ResourceBundle.getBundle("bundles.MyBundle", locale)); 
      Pane pane = (BorderPane) fxmlLoader.load(this.getClass().getResource("MyView.fxml").openStream()); 
      // replace the content 
      StackPane content = (StackPane) ((VBox) stage.getScene().getRoot()).getChildren().get(1); 
      content.getChildren().clear(); 
      content.getChildren().add(pane); 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 
    } 

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

Screenshot:

Answer 2

Dies funktioniert für mich:

└───src 
    ├───app 
    ├───bundles // <- here the "bundles" 
    ├───dicts 
    ├───images 
    ├───libs 
    └───resources 

Im Bündel Paket sind

LangBundle_en.properties 
LangBundle_de.properties 

Beispielinhalt:

enter_pwd=Enter your password: 

sie laden ich den folgenden Code verwenden:

@Override 
public void initialize(URL location, ResourceBundle resources) { 
    ResourceBundle lngBndl = ResourceBundle 
      .getBundle("bundles.LangBundle", new Locale("en", "EN")); 

    tvSetupPwd.setText(lngBndl.getString("enter_pwd")); 
    // ... 
} 

Answer 3

Blick auf mein Beispiel

Mehr beschrieben ich here oder auf GitHub

Update:

die Lösung ist in Messages.java

/** 
* The class with all messages of this application. 
*/ 
public abstract class Messages { 

    private static ResourceBundle BUNDLE; 

    private static final String FIELD_NAME = "lookup"; 
    private static final String BUNDLE_NAME = "messages/messages"; 
    private static final String CONTROLS_BUNDLE_NAME = "com/sun/javafx/scene/control/skin/resources/controls"; 

    public static final String MAIN_APP_TITLE; 

    public static final String DIALOG_HEADER; 
    public static final String MAIN_CONTROLLER_CONTENT_TEXT; 
    public static final String MAIN_CONTROLLER_HELLO_TEXT; 
    public static final String MAIN_CONTROLLER_GOODBYE_TEXT; 

    static { 
     final Locale locale = Locale.getDefault(); 
     final ClassLoader classLoader = ControlResources.class.getClassLoader(); 

     final ResourceBundle controlBundle = getBundle(CONTROLS_BUNDLE_NAME, 
       locale, classLoader, PropertyLoader.getInstance()); 

     final ResourceBundle overrideBundle = getBundle(CONTROLS_BUNDLE_NAME, 
       PropertyLoader.getInstance()); 

     final Map override = getUnsafeFieldValue(overrideBundle, FIELD_NAME); 
     final Map original = getUnsafeFieldValue(controlBundle, FIELD_NAME); 

     //noinspection ConstantConditions,ConstantConditions,unchecked 
     original.putAll(override); 

     BUNDLE = getBundle(BUNDLE_NAME, PropertyLoader.getInstance()); 

     MAIN_APP_TITLE = BUNDLE.getString("MainApp.title"); 

     DIALOG_HEADER = BUNDLE.getString("Dialog.information.header"); 
     MAIN_CONTROLLER_CONTENT_TEXT = BUNDLE.getString("MainController.contentText"); 
     MAIN_CONTROLLER_HELLO_TEXT = BUNDLE.getString("MainController.helloText"); 
     MAIN_CONTROLLER_GOODBYE_TEXT = BUNDLE.getString("MainController.goodbyeText"); 
    } 

    public static ResourceBundle GetBundle() { 
     return BUNDLE; 
    } 
} 

und in PropertyLoader.java

public class PropertyLoader extends ResourceBundle.Control { 

    private static final String PROPERTIES_RESOURCE_NAME = "properties"; 

    private static final PropertyLoader INSTANCE = new PropertyLoader(); 

    public static PropertyLoader getInstance() { 
     return INSTANCE; 
    } 

    @Override 
    public ResourceBundle newBundle(final String baseName, final Locale locale, final String format, 
            final ClassLoader loader, final boolean reload) 
      throws IllegalAccessException, InstantiationException, IOException { 

     final String bundleName = toBundleName(baseName, locale); 
     final String resourceName = toResourceName(bundleName, PROPERTIES_RESOURCE_NAME); 

     ResourceBundle bundle = null; 
     InputStream stream = null; 

     if (reload) { 

      final URL url = loader.getResource(resourceName); 

      if (url != null) { 
       final URLConnection connection = url.openConnection(); 
       if (connection != null) { 
        connection.setUseCaches(false); 
        stream = connection.getInputStream(); 
       } 
      } 

     } else { 
      stream = loader.getResourceAsStream(resourceName); 
     } 

     if (stream != null) { 
      try { 
       bundle = new PropertyResourceBundle(new InputStreamReader(stream, StandardCharsets.UTF_8)); 
      } finally { 
       stream.close(); 
      } 
     } 

     return bundle; 
    } 
}