如果您需要动态更新登录的用户权限(当这些权限发生变化时,无论什么原因),无需登出并登录,您只需要重置Spring SecurityContextHolder中的Authentication对象(安全令牌)即可.

例：

Authentication auth = SecurityContextHolder.getContext().getAuthentication();

List updatedAuthorities = new ArrayList<>(auth.getAuthorities());

updatedAuthorities.add(...); //add your role here [e.g., new SimpleGrantedAuthority("ROLE_NEW_ROLE")]

Authentication newAuth = new UsernamePasswordAuthenticationToken(auth.getPrincipal(), auth.getCredentials(), updatedAuthorities);

SecurityContextHolder.getContext().setAuthentication(newAuth);