在Spring AbstractRoutingDataSource中访问Struts2语言环境

Question

Our application uses Struts2 Internalization and Spring AbstractRoutingDataSource for dynamic database changes. Changing the language, the corresponding language database should be selected.

So the below code makes the dynamic database selection using Spring RoutingDataSource .

public class RoutingDataSource extends AbstractRoutingDataSource {
    protected Object determineCurrentLookupKey() {
        return LanguageContextHolder.getLanguagetype();
    }
}

Spring RoutingDataSource is working fine.

My problem is how to set the locale on change. Since it is stored in Struts2, I am not able to access it in Spring.

I found the Spring MVC org.springframework.context.i18n.LocaleContextHolder would do this, but since we are using Struts2, how can I do the above?

Answer 1

Struts2 stores current locale in session with default key WW_TRANS_I18N_LOCALE . To access session inside your RoutingDataSource use ActionContext.getContext().getSession() method.

// ...

if (ActionContext.getContext() != null) {
  Map<String, Object> session = ActionContext.getContext().getSession();

  if (session != null && session.containsKey(I18nInterceptor.DEFAULT_SESSION_ATTRIBUTE)) {
    Locale locale = (Locale) session.get(I18nInterceptor.DEFAULT_SESSION_ATTRIBUTE);
  }
}

// ...

Answer 2

In my example above "return LanguageContextHolder.getLanguagetype();" will return ThreadLocal type. And it is implemented as below.

public class LanguageContextHolder implements Serializable {    

private static ThreadLocal<LanguageType> languageType = new ThreadLocal<LanguageType>();

public static ThreadLocal<LanguageType> getLanguagetype() {
    return languageType;
}

public static void setLanguagetype(ThreadLocal<LanguageType> languagetype) {
    languageType = languagetype;
}

public static void clearLanguageType() {
    languageType.remove();
}

}