Get current user information in spring security

Recently learning to use Spring security 3, searching for some useful things to write down

Source of reference: http://blog.163.com/tarcy_tw/blog/static/317235320108118119601/

If you just want to display the currently logged user name from the page, you can use the taglib provided by spring security directly.

<%@ taglib prefix= "SEC" uri= "Http://www.springframework.org/security/tags"%>
<div>username: <sec:authentication property= "Name"/></div>

If you want to get the current login user's object in your program.

Userdetails userdetails = (userdetails) securitycontextholder.getcontext ()
. Getauthentication ()
. Getprincipal ();

If you want to get all the permissions that the current login user has.

grantedauthority[] authorities = Userdetails.getauthorities ();