spring security 獲取當前登錄用戶

public class SpringSecurityUtil {

//session 由controller 注入參數傳入
public static String currentUser(HttpSession session) {
SecurityContextImpl securityContext = (SecurityContextImpl) session.getAttribute("SPRING_SECURITY_CONTEXT");
return ((UserDetails)securityContext.getAuthentication().getPrincipal()).getUsername();
}
}