For using GET ,parameters can not be hidden. You can redirect through POST method. Go through example :
@RequestMapping(method = RequestMethod.POST)
public ModelAndView postRedirect(){
String redirectUrl = "http://www.okay.com";
RedirectView vf = new RedirectView(redirectUrl);
vf.setStatusCode(HttpStatus.TEMPORARY_REDIRECT);
ModelAndView md = new ModelAndView(vf);
md.addObject("param1", "hello"); //Add your params here
return md;
}