String 转 LocalDateTime 并比较时间范围

private static Boolean compare(String lowerBound, String upperBound, String createTime) {
        DateTimeFormatter dfFrontEnd = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        DateTimeFormatter dfBackEnd = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS+08:00");
        LocalDateTime lower = LocalDateTime.parse(lowerBound, dfFrontEnd);
        LocalDateTime upper = LocalDateTime.parse(upperBound, dfFrontEnd);
        LocalDateTime creatT = LocalDateTime.parse(createTime,dfBackEnd);
        return creatT.isAfter(lower) && creatT.isBefore(upper);
    }