How to localize the whole java spring application

Question

I know about standard way to localize java spring application with adding ?lang=en(fr, de, ch), but it is localize only one page, than after move to other page (press on any href="/newpage"), there again default locale, not choosen before. My question is: how i can ot determinate at login page (or index page) user locale and set it as default locale for the whole web application?

Update question 14.02.2014-16:32 Addition information.

Default spring implementation of localization it is adding "?lang=en" to request URI and takes new messages from bundle. So there is an example: default locale set to en uri: http://example.com/index - en locale. uri: http://example.com/index?lang=de - German Locale setted - page translated to German. But than, i click on the link, which got href="/profile". When i clicked: uri: http://example.com/profile - i got default locale - en.

What i want: uri: http://example.com/index - user press on German flag in the top of the site, than some bean get this action and set default locale - German. Than all pages will loading with default german locale. uri: http://example.com/profile - default locale - German.

In uri request example, i want something like that: example.com - detect user locale - set default locale, German for an example/ User press on English flag - default locale set to English for all pages.

Update question 14.02.2014-17:38 Addition information. Information about my mistake Everything is good. I marked right answer. Spring standard implementation works great and exactly i want. I got mistake in JSP pages with not full translate, and when i change locale, i though that not everything translated - but it was. Thanks!

Answer 1

The Spring Documentation is very well for this theme: 17.8 Using locales You need two things:

• A LocalResolver - that is holds the local for an user and when the user send a request, it add the local to the request context (available via RequestContext.getLocale()) - often the SessionLocalResolver or CookieLocaleResolver is used for a normal web page based application - it is important that the bean id/name is localeResolver (DispatcherServlet.LOCALE_RESOLVER_BEAN_NAME="localeResolver") - (if the name is different, then DispatcherServlet will not find the locale resolver !
• A LocaleChangeInterceptor that change the locale when the user add ?lang=de to its request.

example configuration

<bean class="org.springframework.web.servlet.i18n.CookieLocaleResolver"
      id="localeResolver"
      name="localeResolver">        
   <property name="defaultLocale" value="en"/>
</bean>

<mvc:interceptors>
     <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"
           p:paramName="lang">          
     </bean>
     ...
</mvc:interceptors>

For your problem, it is likely that something with the LocalResolver is wrong, maybe you just forget to set its id/name* to localeResolver or you use a AcceptHeaderLocaleResolver (that always "fall back" the the request header locale)

* see this answer for the difference between Id and Name