docs: private Authentication getAuthentication(SecurityContext securityContext) {
  		// 用户未登录
  		Authentication authentication = securityContext.getAuthentication();
  		if (authentication == null) {
  			authentication = new AnonymousAuthenticationToken(UUID.randomUUID().toString(), "anonymous",
  					Collections.<GrantedAuthority> singletonList(new SimpleGrantedAuthority("ROLE_ANONYMOUS")));
  		}
  		return authentication;
  	}