Java 指定数字和时间区间,找出每月和数字相同的日期(升级版)

书接上回,由于上次的写法都是纯原生的,这次就借助一些轮子(hutool工具类)完善一下

输入: "2023-03-01", "2023-07-02", 10 输出: "2023-03-01", "2023-03-10", "2023-04-10", "2023-05-10", "2023-06-10", "2023-07-02" 具体实现

public static List<String> getDatePeriodFromRange(String startDateStr, String endDateStr, int day) {
        //指定转换格式
        List<String> dateStrList = new ArrayList<>();
        //开始和结束时间转换
        LocalDate start = LocalDateTimeUtil.parseDate(startDateStr, DateTimeFormatter.ISO_LOCAL_DATE);
        LocalDate end = LocalDateTimeUtil.parseDate(endDateStr, DateTimeFormatter.ISO_LOCAL_DATE);
        //获取开始和结束时间的年月 格式"uuuu-MM"
        YearMonth from = YearMonth.from(start);
        YearMonth to = YearMonth.from(end);
        for (long i = 0; i <= ChronoUnit.MONTHS.between(from, to); i++) {
            YearMonth yearMonth = from.plusMonths(i);
            int dayTemp = day;
            //判断指定的日期是否能和年月构成有效日期
            if (!yearMonth.isValidDay(day)) {
                //不符合则返回该月的最后一天
                dayTemp = yearMonth.lengthOfMonth();
            }
            //拼接完整的日期
            String format = StrUtil.format("{}-{}", Convert.toStr(yearMonth),
                    StrUtil.padPre(Convert.toStr(dayTemp), 2, "0"));
            dateStrList.add(format);
        }
        //对于拼接后的日期进行一次筛选 保证拼接的日期是在开区间(startDateStr,endDateStr)
        List<String> result = dateStrList.stream()
                .filter(s -> {
                    LocalDate sdate = LocalDateTimeUtil.parseDate(s, DateTimeFormatter.ISO_LOCAL_DATE);
                    return (sdate.isAfter(start) && sdate.isBefore(end));
                }).collect(Collectors.toList());
        //最后再加上开始和结束时间 形成闭区间[startDateStr,endDateStr]
        result.add(0, startDateStr);
        result.add(endDateStr);
        return result;
    }