JDK8获取一段时间范围内符合星期几的日期集合

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最新推荐文章于 2023-02-25 11:48:48 发布

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分类专栏： jdk8 文章标签： java jdk

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本文介绍了如何利用JDK8的日期时间API，从2020-1-1到2020-5-1的日期范围内筛选出所有的周六和周日。

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例：获取2020-1-1到2020-5-1中为周六、周日的日期

/**
   package cn.hgh.jdk.time;

import java.time.*;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @author hgh
 * @since 2020-05-13 15:14
 */
public class TimeDemo {

    public static void main(String[] args) {
        List<LocalDate> betweenDate = getMeetDayOfWeekLocalDates(LocalDate.of(2020, 1, 1), LocalDate.of(2020, 5, 1).plusDays(30), "6,7");
        System.out.println(betweenDate);
    }

    /**
     * JDK8获取一段时间范围内符合星期几的日期集合
     * @param startDate 开始时间
     * @param endDate   结束时间
     * @param workDate  周几 1,2,3,4
     */
    public static List<java.time.LocalDate> getMeetDayOfWeekLocalDates(java.time.LocalDate startDate, java.time.LocalDate endDate, String workDate) {

        List<DayOfWeek> dayOfWeeks = Stream.of(workDate.split(","))
                                           .map(Integer::valueOf)
                                           .map(DayOfWeek::of)
                                           .collect(Collectors.toList());

        long distance = ChronoUnit.DAYS.between(startDate, endDate);

        return Stream.iterate(startDate, d -> d.plusDays(1))
                     .limit(distance + 1)
                     .filter(localDate -> dayOfWeeks.contains(localDate.getDayOfWeek()))
                     .collect(Collectors.toList());
    }

    public static List<Date> getMeetDayOfWeekDates(Date startDate, Date endDate, String workDate) {
        java.time.LocalDate start = startDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
        java.time.LocalDate end = endDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
        List<java.time.LocalDate> meetDayOfWeekLocalDates = getMeetDayOfWeekLocalDates(start, end, workDate);
        return meetDayOfWeekLocalDates.stream()
                                      .map(localDate -> Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant()))
                                      .collect(Collectors.toList());
    }

}