获取时间段内的周列表，在本年中的第几周

package com.seeingtv.statement.api;


import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class Test {
    public static void main(String[] args) throws Exception {
        List weeks = getWeeks("2020-12-27", "2021-01-08");
        System.out.println(weeks);

//        c.setFirstDayOfWeek(Calendar.MONDAY);
//        c.setMinimalDaysInFirstWeek(7);
//        c.setTime (date);
    }

    public static List getWeeks(String startTime, String endTime) throws Exception {
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        Date d1 = df.parse(startTime);
        Date d2 = df.parse(endTime);

//        Date date = DateUtil.parse(startTime);
        Calendar c = Calendar.getInstance();
        c.setFirstDayOfWeek(Calendar.MONDAY);
//        c.setMinimalDaysInFirstWeek(7);
        c.setTime(d1);
//获取开始时间是当年的第几周
        int startWeek = c.get(Calendar.WEEK_OF_YEAR);
//获取月份,如果月份是12,并且周数是1,重新赋值53周
        int startMonth = c.get(Calendar.MONTH) + 1;
        if (startMonth == 12 && startWeek == 1) {
            startWeek = 53;
        }
//获取开始的年份
        int startYear = c.get(Calendar.YEAR);
//        Date dateEnd = DateUtil.parse(endTime);
        Calendar cEnd = Calendar.getInstance();
        cEnd.setFirstDayOfWeek(Calendar.MONDAY);
//        cEnd.setMinimalDaysInFirstWeek(7);
        cEnd.setTime(d2);
//获取结束时间是第几周
        int endWeek = cEnd.get(Calendar.WEEK_OF_YEAR);
//获取月份,如果月份是12,并且周数是1,重新赋值53周
        int endMonth = cEnd.get(Calendar.MONTH) + 1;
        if (endMonth == 12 && endWeek == 1) {
            endWeek = 53;
        }
//获取结束时间的年份
        int endYear = cEnd.get(Calendar.YEAR);
        List list = new ArrayList<>();
//默认每年53周
        if (endYear == startYear) {
            for (int week = startWeek; week <= endWeek; week++) {
                String yearAndWeek = startYear + "-" + week;
                list.add(yearAndWeek);
            }
        }
        if (endYear > startYear) {
//计算相差年份
            int year = endYear - startYear;
//循环次数
            int count;
            if (year == 1) {
//循环次数
                count = 53 - startWeek + endWeek - 1;
            } else {
                int i = endYear - startYear;//循环次数
                count = 53 - startWeek + (i - 1) * 53 + endWeek;
            }
            for (int i = 0; i <= count; i++) {
                if (startWeek >= 53 && endWeek >= 1){
                    startYear = startYear + 1;
                    startWeek = 1;
                }

                String yearAndWeek = startYear + "-"+startWeek;
                startWeek++;
                // 这是原先的方法
                /*if (startWeek == 54) {
                    startWeek = 1;
                    startYear = startYear + 1;
                }*/
                list.add(yearAndWeek);
            }
        }
        return list;
    }
}

java输出两个日期之间的每一周_Time时间的朋友的博客-优快云博客_java获取两个日期之间的所有周