How do you enable LocaleInterceptor to change the locale in spring-security login page?

Question

Pardon me if this question has been asked before, but I haven\'t gotten a straight answer that helped me solve my problem. I have a gwt application that I have secured using sp

Answer 1

Thanks @Ritesh for give the answer. You give me a idea to handle this problem. I worked around it on a further way:

public class InternationalizationFilter extends OncePerRequestFilter {
  private Logger log=Logger.getLogger(InternationalizationFilter.class);
  private String localeParam="lang";
  private LocaleResolver localeResolver;

  public InternationalizationFilter(String localeParam, LocaleResolver localeResolver) {
    this.localeParam = localeParam;
    this.localeResolver = localeResolver;
  }

  @Override
  public void destroy() {
    // TODO Auto-generated method stub

  }

  @Override
  protected void doFilterInternal(
      final HttpServletRequest request,
      final HttpServletResponse response,
      final FilterChain filterChain)
      throws ServletException, IOException {
    if (localeResolver == null) {
      throw new IllegalStateException("No LocaleResolver found: not in a DispatcherServlet request?");
    }
    else{
      final String newLocale = request.getParameter(localeParam);
      if (newLocale != null) {
        final Locale locale = StringUtils.parseLocaleString(newLocale.toLowerCase());
        LocaleContextHolder.setLocale(locale);
        LocaleEditor localeEditor = new LocaleEditor();
        localeEditor.setAsText(newLocale);
        localeResolver.setLocale(request, response, (Locale) localeEditor.getValue());
        log.debug("change locale to "+
            locale.getLanguage()+"_"+locale.getCountry()+
            " at Thread"+Thread.currentThread().getId());
      }
      else{
        final Locale locale=localeResolver.resolveLocale(request);
        LocaleContextHolder.setLocale(locale);
        log.debug("restore locale to "+
            locale.getLanguage()+"_"+locale.getCountry()+
            " at Thread"+Thread.currentThread().getId());
      }
      try {
        filterChain.doFilter(request, response);
      } finally {
        LocaleContextHolder.resetLocaleContext();
      }
    }
  }

}

With declared the localChangeInterceptor and localeResolver in mvc config file. So we can change locale with request param "lang":

In the security config file,I made a i18nFilter and added it to the Filter Chain:

with localChangeInterceptor & localeResolver,I can change locale and save locale into session or cookie.

under localeResolver's help,InternationalizationFilter could store/restore locale and make change to LocaleContextHolder's locale.