/**
     * 获取属性
     * @param clazz
     * @param fieldName
     * @return
     */
    public static Field getDeclaredField(Class clazz, String fieldName) {
        if (Strings.isNullOrEmpty(fieldName)) {
            return null;
        }
        while (clazz != null) {
            try {
                return clazz.getDeclaredField(fieldName);
            } catch (NoSuchFieldException e) {

            }
            clazz = clazz.getSuperclass();
        }
        return null;
    }