Spring mvc interceptor addObject

Question

I have an interceptor which extends the HandlerInterceptorAdapter.

When I add an object to my ModelAndView it also gets added to my url as a path variable but I don't want that.

@Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
    if (null == modelAndView) {
      return;
    }

    log.info("Language in postHandle: {}", LocaleContextHolder.getLocale());
    modelAndView.addObject("selectedLocale", LocaleContextHolder.getLocale());
}

When I add something to my ModelAndView in the controller itself, it doesn't appear in the url.

Answer 1

My suspicion is that the controller has returned a redirect view. When you add attributes to the model used by RedirectView, Spring will tack the attributes on to the URL.

Try looking inside the ModelAndView object to see if the view is a RedirectView, and if so, then don't add the locale attribute.

Answer 2

Try this

import static org.springframework.web.servlet.view.UrlBasedViewResolver.REDIRECT_URL_PREFIX; 

private boolean isRedirectView(ModelAndView mv) {

    String viewName = mv.getViewName();
    if (viewName.startsWith(REDIRECT_URL_PREFIX)) {
        return true;
    }

    View view = mv.getView();
    return (view != null && view instanceof SmartView
            && ((SmartView) view).isRedirectView());
}