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

User · Accepted Answer

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()
}

User · Answer

if you are using spring security then you can get the current logged in user by  Authentication auth   SecurityContextHolder getContext   getAuthentication         String name   auth getName      get logged in username

User · Answer

You can use below code to find out principal  user email who logged in     org opensaml saml2 core impl NameIDImpl principal        NameIDImpl  SecurityContextHolder getContext   getAuthentication   getPrincipal       String email   principal getValue      This code is written on top of SAML

User · Answer

Let Spring 3 injection take care of this   Thanks to tsunade21 the easiest way is     RequestMapping method   RequestMethod GET      public ModelAndView anyMethodNameGoesHere Principal principal            final String loggedInUserName   principal getName

User · Answer

That s another solution  Spring Security 3    public String getLoggedUser   throws Exception       String name   SecurityContextHolder getContext   getAuthentication   getName        return   name equals  anonymousUser      name   null

User · Answer

If you just want to print user name on the pages  maybe you ll like this solution  It s free from object castings and works without Spring Security too    RequestMapping value     index html   method   RequestMethod GET  public ModelAndView indexView HttpServletRequest request         ModelAndView mv   new ModelAndView  index         String userName    not logged in      Any default user  name     Principal principal   request getUserPrincipal        if  principal    null            userName   principal getName               mv addObject  username   userName           By adding a little code  same way  you can check if user has any        roles you need  for example       boolean fAdmin   request isUserInRole  ROLE ADMIN        mv addObject  isAdmin   fAdmin        return mv      Note  HttpServletRequest request  parameter added   Works fine because Spring injects it s own objects  wrappers  for HttpServletRequest  Principal etc   so you can use standard java methods to retrieve user information

[java] Get UserDetails object from Security Context in Spring MVC controller

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