How to set locale dinamically via code in Struts 2

Question

In my application, I have to display the content based on the locale that an user has chosen in the configuration page. I am not using a browser default locale.

when using <s:text>, it always use the default resource file.

In Struts1, I have used the below code to set default locale in my filter

session.setAttribute("org.apache.struts.action.LOCALE",locale);

How to set the user chosen locale dynamically in Struts2 ?

Answer 1

You set the locale in the following way in Struts 2:

ActionContext ctx = ActionContext.getContext();
if (ctx != null)
{
    ctx.setLocale(locale);
}

You can also use the I18nInterceptor.

Answer 2

The Struts2 internationalization interceptor i18n could be used to dynamically change the current user locale to the user specific locale for the user's session.

"Or, alternatively, only for the current request (since XWork 2.1.3)"

by making an HTTP request and supplying a request parameter request_locale with the value of the locale like "en_US" which create a locale for English, US.

This locale is saved in the session by default under "WW_TRANS_I18N_LOCALE" attribute and used as a current locale during the user session. The current locale is also pushed into the ActionContext map by this interceptor upon every request. This allows framework components that support localization all utilize the ActionContext's locale.

More detailed description with example code you could find in the docs for I18n Interceptor.

An interceptor that handles setting the locale specified in a session as the locale for the current action request. In addition, this interceptor will look for a specific HTTP request parameter and set the locale to whatever value is provided. This means that this interceptor can be used to allow for your application to dynamically change the locale for the user's session or, alternatively, only for the current request (since XWork 2.1.3). This is very useful for applications that require multi-lingual support and want the user to be able to set his or her language preference at any point. The locale parameter is removed during the execution of this interceptor, ensuring that properties aren't set on an action (such as request_locale) that have no typical corresponding setter in your action.

For example, using the default parameter name, a request to foo.action?request_locale=en_US, then the locale for US English is saved in the user's session and will be used for all future requests. If there is no locale set (for example with the first visit), the interceptor uses the browser locale.

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Answer 3

This worked for me :

String language = userLocale.substring(0, 2);
String country = userLocale.substring(3, 5);
Locale locale = new Locale(language, country);
ActionContext.getContext().setLocale(locale);
session.put(I18nInterceptor.DEFAULT_SESSION_ATTRIBUTE, locale);

where the values of userLocale are of the form : fr_FR and the file for the resources is named resource_fr_FR.properties