Get UserDetails object from Security Context in Spring MVC controller

Question

I'm using Spring Security 3 and Spring MVC 3.05.

I would like to print username of currently logged in user,how can I fetch UserDetails in my Controller?

@RequestMapping(value="/index.html", method=RequestMethod.GET)     public ModelAndView indexView(){          UserDetails user = ?                 mv.addObject("username", user.getUsername());         ModelAndView mv = new ModelAndView("index");         return mv;     }    

Answer 1

If you already know for sure that the user is logged in (in your example if /index.html is protected):

UserDetails userDetails =  (UserDetails)SecurityContextHolder.getContext().getAuthentication().getPrincipal(); 

To first check if the user is logged in, check that the current Authentication is not a AnonymousAuthenticationToken.

Authentication auth = SecurityContextHolder.getContext().getAuthentication(); if (!(auth instanceof AnonymousAuthenticationToken)) {         // userDetails = auth.getPrincipal() }