JavaFX 2 e Internazionalizzazione

Question

Ho appena iniziato a scrivere la mia prima applicazione JavaFX 2 dopo aver appreso le nozioni di base e vorrei internazionalizzarla.

Ho notato che in JavaFX 1.x, il linguaggio di scripting consentiva una semplicissima internazionalizzazione delle stringhe. Ci sono caratteristiche simili in JavaFX 2?

Fondamentalmente: qual è la procedura migliore per l'internazionalizzazione di un'applicazione JavaFX 2?

Answer 1

I passaggi di base (tra gli altri) di un'app per l'internazionalizzazione delle app Java, sono il lining Locale e il raggruppamento delle risorse. In JavaFX, è possibile utilizzare FXMLLoader#setResources() per tali scopi. Ecco una dimostrazione SSCCE per dimostrarlo. I codici sono auto-descrittivi.
Dimostrazione struttura del pacchetto:

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

Questo funziona per me:

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

Nel pacchetto bundle sono

LangBundle_en.properties 
LangBundle_de.properties 

contenuti del campione:

enter_pwd=Enter your password: 

Per caricare li uso il seguente codice:

@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

Guardate il mio esempio

Più ho descritto here o GitHub

Aggiornamento:

la soluzione è 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; 
    } 
} 

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; 
    } 
}