Internationalization in Vaadin with property file

问题

I found a useful example for internationalization in Vaadin. Here is online-demo for this. I tried with combobox for locale change as ..

private Locale localeMyanmar, localeEnglish;
private static final String LOCALE_COOKIE = "locale";
.......
localeMyanmar = new Locale("my", "Burmese");
localeEnglish = Locale.ENGLISH;
.........
    final ComboBox cbLanguage = new ComboBox();
    cbLanguage.addStyleName("comboIconCaption");
    cbLanguage.setNullSelectionAllowed(false);
    cbLanguage.setImmediate(true);

    IndexedContainer ic = new IndexedContainer();
    ic.addItem("Myanmar");
    ic.addItem("English");
    cbLanguage.setContainerDataSource(ic);

    cbLanguage.setItemIcon("Myanmar", new ThemeResource("img/Myanmar-flag.png"));
    cbLanguage.setItemIcon("English", new ThemeResource("img/US-flag.png"));

    Cookie localeCookie = getCookieByName(LOCALE_COOKIE);
    if (localeCookie != null && localeCookie.getValue() != null) {
        if (localeCookie.getValue().equals("my")) {
            cbLanguage.setValue("Myanmar");
            setLocale(localeMyanmar);
        }
        else {
            cbLanguage.setValue("English");
            setLocale(localeEnglish);
        }
    }
    else {
        cbLanguage.setValue("Myanmar");
        // Create a new cookie , 2678400 = 1 month
        localeCookie = createCookie(LOCALE_COOKIE, "my", 2678400);
        setLocale(localeMyanmar);
    }
    message.initializeMessageResource(getLocale());

    cbLanguage.addValueChangeListener(new ValueChangeListener() {

        public void valueChange(final ValueChangeEvent event) {
            if (cbLanguage.getValue().toString().equals("Myanmar")) {
                destroyCookieByName(LOCALE_COOKIE);
                createCookie(LOCALE_COOKIE, "my", 2678400);
                setLocale(localeMyanmar);
            }
            else {
                destroyCookieByName(LOCALE_COOKIE);
                createCookie(LOCALE_COOKIE, "en", 2678400);
                setLocale(localeEnglish);
            }
            message.initializeMessageResource(getLocale());

        }
    });

Message.java

public class Message implements Serializable {
private ResourceBundle i18n;

public final void initializeMessageResource(final Locale locale) {
    i18n = ResourceBundle.getBundle(OfficeMessage.class.getName(), locale);
}
public final String getLocalizeMessage(final String key) {
    return i18n.getString(key);
}
}

OfficeMessage.java

public class OfficeMessage extends ListResourceBundle implements Serializable {
@Override
protected Object[][] getContents() {
    return null;
}
public static String generateId() {
    return new Integer(ids++).toString();
}

private static int ids = 0;

// Constants
public static final String OK = generateId();
public static final String CANCEL = generateId();
public static final String SAVE = generateId();
public static final String RESET = generateId();
}

OfficeMessage_my.java

public class OfficeMessage_my extends OfficeMessage {
@Override
public final Object[][] getContents() {
    return contents_en;
}

static final Object[][] contents_en = {
        // Basic Buttons Text
        { OK, "သဘောတူသည်" },
        { CANCEL, "သဘောမတူပါ" },
        { SAVE, "သိမ်းမည်" },
        { RESET, "နဂိုအတိုင်းပြန်ထားမည်" },
};
}

OfficeMessage_en.java

public class OfficeMessage_en extends OfficeMessage {
@Override
public final Object[][] getContents() {
    return contents_en;
}

static final Object[][] contents_en = {
        // Basic Buttons Text
        { OK, "OK" },
        { CANCEL, "Cancel" },
        { SAVE, "Save" },
        { RESET, "Reset" },
};
}

And call for internationalize as btnUpdate.setCaption(message.getLocalizeMessage(OfficeMessage.OK));.

My questions are

1. I don't want to create with constant java classes . I would like to create with properties files (eg: OfficeMessage_my.properties , OfficeMessage_en.properties). I didn't find any references for this. Please somebody help me how can I do with xxx.properties files.

2. How to do for messages ? I also want to create messages (may be dynamic) with internationalize. For example :message.sayHello(currentLoginUser). When I want to use dynamic messages , How can I figure it out ?

回答1:

I found a way to create both Constants and Messages with properties files via this link. Finally , My Constants and Messages classes as below ,

Constants.java

public class Constants implements Serializable {
private static final String BUNDLE_NAME = "myProject.i18n.Constants.Constants";
private ResourceBundle i18n;

public final void init(final Locale locale) {
    i18n = ResourceBundle.getBundle(BUNDLE_NAME, locale);
}
public final String getConstantValue(final String key) {
    try {
        return new String(i18n.getString(key).getBytes("ISO-8859-1"), "UTF-8");
    }
    catch (UnsupportedEncodingException e) {
        return '!' + key + '!';
    }
    catch (MissingResourceException e) {
        return '!' + key + '!';
    }
}
}

Messages.java

public class Messages implements Serializable {
private static final String BASE_NAME = "myProject.i18n.Messages.Messages";
private ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
private Locale locale;

public final void init(final Locale locale) {
    this.locale = locale;
    messageSource.setBasename(BASE_NAME);
}

public final String getMessageValue(final String key) {
    try {
        return new String(messageSource.getMessage(key, null, locale).getBytes("ISO-8859-1"), "UTF-8");
    }
    catch (UnsupportedEncodingException e) {
        return '!' + key + '!';
    }
    catch (NoSuchMessageException e) {
        return '!' + key + '!';
    }
}

public final String getMessageValue(final String key, final Object[] parameters) {
    try {
        return new String(messageSource.getMessage(key, parameters, locale).getBytes("ISO-8859-1"), "UTF-8");
    }
    catch (UnsupportedEncodingException e) {
        return '!' + key + '!';
    }
    catch (NoSuchMessageException e) {
        return '!' + key + '!';
    }
}
}

回答2:

Checkout a sample solution in regards to Internationalization (i18n) in vaadin and Spring framework, implemented by Jaroslav H. in 'Vaadin 7 Cookbook'

• https://github.com/peholmst/vaadin-spring-webinar/tree/master/i18n
• https://vaadin.com/forum#!/thread/3704190

来源：https://stackoverflow.com/questions/25278825/internationalization-in-vaadin-with-property-file