按月切割日期

axia623867666

已于 2024-09-03 14:46:52 修改

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文章标签： java 开发语言

于 2023-12-28 15:48:54 首次发布

本文链接：https://blog.youkuaiyun.com/axia623867666/article/details/135271374

版权

该代码展示了如何使用Java的Calendar,SimpleDateFormat和YearMonth类，将给定的起止日期（如2022-07-15到2023-11-11）按月份切割，获取每个月的开始和结束日期。

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import java.time.LocalDate;
import java.time.YearMonth;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class DateRangeGenerator {

    public static void main(String[] args) {
        String startDateString = "2022-07-15";
        String endDateString = "2023-11-11";

        LocalDate startDate = LocalDate.parse(startDateString).withDayOfMonth(1);
        LocalDate endDate = LocalDate.parse(endDateString);

        Map<LocalDate, LocalDate> dateMap = generateDateRanges(startDate, endDate);

        System.out.println(dateMap.toString());

        for (LocalDate date : dateMap.keySet()) {
            LocalDate checkStartDateMonth;
            LocalDate checkEndDateMonth = dateMap.get(date);
            if (date.equals(startDate)) {
                checkStartDateMonth = LocalDate.parse(startDateString);
            } else {
                checkStartDateMonth = date.withDayOfMonth(1);
            }
            System.out.println(checkStartDateMonth);
            System.out.println(checkEndDateMonth);
        }
    }

    private static Map<LocalDate, LocalDate> generateDateRanges(LocalDate startDate, LocalDate endDate) {
        Map<LocalDate, LocalDate> dateMap = new HashMap<>();
        LocalDate currentDate = startDate;

        while (!currentDate.isAfter(endDate)) {
            LocalDate endOfMonth = getEndOfMonth(currentDate);
            dateMap.put(currentDate, endOfMonth);
            currentDate = currentDate.plusMonths(1).withDayOfMonth(1);
        }

        return dateMap;
    }

    private static LocalDate getEndOfMonth(LocalDate date) {
        YearMonth yearMonth = YearMonth.from(date);
        return yearMonth.atEndOfMonth();
    }
}