java - 使用java获取当前周的剩余日期

Question

我正在使用以下代码来获取当前日期和下一个日期。

List<String> list=new ArrayList();
int nextWeekId=2;
int currentWeekId=1;

LocalDate localDate = LocalDate.now();
for (int i = 0; i < list.size(); i++) {
    if (i >= 7) {
        saveDetails(nextWeekId,list.get(i), java.sql.Date.valueOf(localDate.plusDays(i)));
    } else {
        saveDetails(currentWeekId, list.get(i), java.sql.Date.valueOf(localDate.plusDays(i)));
    }
}

我的 list大小总是 size = 14 .一周应该总是从 Monday 开始.我想要，如果例如今天是 Friday日期是 2020-07-10 .然后我的系统将存储日期 2020-07-10 , 2020-07-11 , 2020-07-12反对 currentWeekId以及接下来的 7 天对 nextWeekId .
访问值的顺序无关紧要。

Answer 1

为了获得本周的剩余天数，您需要从当前日期迭代到下一个星期一，如下所示:

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;

public class Main {
    public static void main(String[] args) {
        LocalDate localDate = LocalDate.now();
        LocalDate firstDayOfNextWeek = localDate.with(TemporalAdjusters.next(DayOfWeek.MONDAY));
        while (localDate.isBefore(firstDayOfNextWeek)) {
            System.out.println(localDate);
            localDate = localDate.plusDays(1);
        }
    }
}

输出:

2020-07-11
2020-07-12

请注意 LocalDate#with 返回目标对象的副本，其中一个元素发生了变化；这是不可变的等价于 set JavaBean 上的方法。
[更新]:下面给出的是另一种方法(Cortesy: Basil Bourque):

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;
import java.util.List;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        LocalDate localDate = LocalDate.now();
        LocalDate firstDayOfNextWeek = localDate.with(TemporalAdjusters.next(DayOfWeek.MONDAY));
        List<LocalDate> remainingDays = localDate.datesUntil(firstDayOfNextWeek)
                .collect(Collectors.toList());
        System.out.println(remainingDays);
    }
}

输出:

[2020-07-11, 2020-07-12]

查询 LocalDate#datesUntil 了解更多信息。
【又一更新】
发布此更新以帮助 OP 列出下一周的所有日子:

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;
import java.util.List;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        LocalDate localDate = LocalDate.now();

        // Remaining days of the current week
        LocalDate firstDayOfNextWeek = localDate.with(TemporalAdjusters.next(DayOfWeek.MONDAY));
        List<LocalDate> remainingDays = localDate.datesUntil(firstDayOfNextWeek).collect(Collectors.toList());
        System.out.println(remainingDays);

        // Days of next week
        LocalDate firstDayOfNextToNextWeek = firstDayOfNextWeek.with(TemporalAdjusters.next(DayOfWeek.MONDAY));
        List<LocalDate> daysOfNextWeek = firstDayOfNextWeek.datesUntil(firstDayOfNextToNextWeek)
                .collect(Collectors.toList());
        System.out.println(daysOfNextWeek);
    }
}

输出:

[2020-07-11, 2020-07-12]
[2020-07-13, 2020-07-14, 2020-07-15, 2020-07-16, 2020-07-17, 2020-07-18, 2020-07-19]