public class TestWeekNumAndDate {/*** @param args*/public static void main(String[] args) {//初始化，第一周至少四天WeekFields wfs= WeekFields.of(DayOfWeek.MONDAY, 4);//一年最后一天日期的LocalDate，如果该天获得的周数为1或52，那么该年就只有52周，否则就是53周//获取指定时间所在年的周数int num= LocalDate.of(, 12, 31).get(wfs.weekOfWeekBasedYear());num = num == 1 ? 52 : num;System.out.println("第" + num + "周，周一日期:" + getDateByYearAndWeekNumAndDayOfWeek(, num, DayOfWeek.MONDAY));System.out.println("第" + num + "周，周二日期:" + getDateByYearAndWeekNumAndDayOfWeek(, num, DayOfWeek.TUESDAY));System.out.println("第" + num + "周，周三日期:" + getDateByYearAndWeekNumAndDayOfWeek(, num, DayOfWeek.WEDNESDAY));System.out.println("第" + num + "周，周四日期:" + getDateByYearAndWeekNumAndDayOfWeek(, num, DayOfWeek.THURSDAY));System.out.println("第" + num + "周，周五日期:" + getDateByYearAndWeekNumAndDayOfWeek(, num, DayOfWeek.FRIDAY));System.out.println("第" + num + "周，周六日期:" + getDateByYearAndWeekNumAndDayOfWeek(, num, DayOfWeek.SATURDAY));System.out.println("第" + num + "周，周日日期:" + getDateByYearAndWeekNumAndDayOfWeek(, num, DayOfWeek.SUNDAY));//该格式周日为一周第一天，周六为一周最后一天System.out.println(LocalDate.parse("-52-1", DateTimeFormatter.ofPattern("YYYY-ww-e", Locale.CHINA)));}private static LocalDate getDateByYearAndWeekNumAndDayOfWeek(Integer year, Integer num, DayOfWeek dayOfWeek) {//周数小于10在前面补个0String numStr = num < 10 ? "0" + String.valueOf(num) : String.valueOf(num);//-W01-01获取第一周的周一日期，-W02-07获取第二周的周日日期String weekDate = String.format("%s-W%s-%s", year, numStr, dayOfWeek.getValue());return LocalDate.parse(weekDate, DateTimeFormatter.ISO_WEEK_DATE);}}
