java

import java.time.LocalDate;
import java.time.DayOfWeek;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAdjusters;
import java.util.ArrayList;
import java.util.List;

class WeekRange {
private LocalDate startDate;
private LocalDate endDate;
private boolean updateFlg;
private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");

public WeekRange(LocalDate startDate, LocalDate endDate, boolean updateFlg) {
    this.startDate = startDate;
    this.endDate = endDate;
    this.updateFlg = updateFlg;
}

public LocalDate getStartDate() {
    return startDate;
}

public LocalDate getEndDate() {
    return endDate;
}

public boolean isUpdateFlg() {
    return updateFlg;
}

@Override
public String toString() {
    return "WeekRange{" +
            "startDate=" + startDate.format(formatter) +
            ", endDate=" + endDate.format(formatter) +
            ", updateFlg=" + updateFlg +
            '}';
}

}

public class WeekRangeCalculator {

public static List<WeekRange> getWeekRanges(String start, String end) {
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");
    LocalDate startDate = LocalDate.parse(start, formatter);
    LocalDate endDate = LocalDate.parse(end, formatter);

    List<WeekRange> weekRanges = new ArrayList<>();

    // 找到第一个开始日期的周一
    LocalDate currentStart = startDate.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));
    // 找到最后一个结束日期的周日
    LocalDate finalEnd = endDate.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));

    while (!currentStart.isAfter(finalEnd)) {
        LocalDate currentEnd = currentStart.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));
        boolean updateFlg = isInCurrentWeek(currentStart) || isInCurrentWeek(currentEnd) ||
                            isInLastWeek(currentStart) || isInLastWeek(currentEnd) ||
                            isInNextWeek(currentStart) || isInNextWeek(currentEnd);
        weekRanges.add(new WeekRange(currentStart, currentEnd, updateFlg));

        // 下一个周的开始日期
        currentStart = currentStart.plusWeeks(1);
    }

    return weekRanges;
}

private static boolean isInCurrentWeek(LocalDate date) {
    LocalDate today = LocalDate.now();
    LocalDate startOfWeek = today.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));
    LocalDate endOfWeek = today.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));
    return !date.isBefore(startOfWeek) && !date.isAfter(endOfWeek);
}

private static boolean isInLastWeek(LocalDate date) {
    LocalDate today = LocalDate.now();
    LocalDate startOfLastWeek = today.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY)).minusWeeks(1);
    LocalDate endOfLastWeek = today.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY)).minusWeeks(1);
    return !date.isBefore(startOfLastWeek) && !date.isAfter(endOfLastWeek);
}

private static boolean isInNextWeek(LocalDate date) {
    LocalDate today = LocalDate.now();
    LocalDate startOfNextWeek = today.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY)).plusWeeks(1);
    LocalDate endOfNextWeek = today.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY)).plusWeeks(1);
    return !date.isBefore(startOfNextWeek) && !date.isAfter(endOfNextWeek);
}

public static void main(String[] args) {
    String start = "20260801";
    String end = "20260831";
    List<WeekRange> weekRanges = getWeekRanges(start, end);

    for (WeekRange range : weekRanges) {
        System.out.println(range);
    }
}

}