从Spring MVC控制器中的Security Context获取UserDetails对象

Question

我正在使用Spring Security 3和Spring MVC 3.05.

我想打印当前登录用户的用户名,如何在Controller中获取UserDetails？

@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

如果您已经确定用户已登录(在您的示例中,如果/index.html受到保护):

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

要首先检查用户是否已登录,请检查当前Authentication是否为a AnonymousAuthenticationToken.

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

Answer 2

让Spring 3注射解决这个问题.

感谢tsunade21,最简单的方法是:

 @RequestMapping(method = RequestMethod.GET)   
 public ModelAndView anyMethodNameGoesHere(Principal principal) {
        final String loggedInUserName = principal.getName();

 }