需求是这样的，需要以整体的样子展示日历，比如，5 *7 或者 6* 7 的格式

我需要把日期数据获取出来，所以我通过后台的得到需要的数据，分析需要3部分数据

中间的一部分直接获取一个月的第一天和最后一天，

前一部分和后一部分通过TemporalAdjusters对应的方法获取，

TemporalAdjusters.dayOfWeekInMonth 可以获取当前月的第X星期的星期几对应的日期，我们可以利用这个处理。

/**

*

*

返回六行日历系统整月之外的日期区间

*

* @param date

* @return java.time.LocalDate[]

* @throws

* @Description : TODO Return date range beyond the full month calendar system

* TODO Demo ：2020-10-01 --> [2020-09-27, 2020-09-30, 2020-11-01, 2020-11-07]

* @author Liruilong

* @Date 2020/11/5 10:50

**/

public static LocalDate[] calendarOsToDay(LocalDate date) {

LocalDate firstDayOfMonth = date.with(TemporalAdjusters.firstDayOfMonth());

LocalDate lastDayOfMonth = date.with(TemporalAdjusters.lastDayOfMonth());

LocalDate monthSaturday = date.with(TemporalAdjusters.dayOfWeekInMonth(6, DayOfWeek.SATURDAY));

LocalDate monthSunday = date.with(TemporalAdjusters.dayOfWeekInMonth(0, DayOfWeek.SUNDAY));

LocalDate[] localDate = new LocalDate[]{firstDayOfMonth,firstDayOfMonth,lastDayOfMonth,lastDayOfMonth};

// 整月之前

if (firstDayOfMonth.getDayOfWeek().getValue() != DayOfWeek.SUNDAY.getValue()){

LocalDate lastMonth = LocalDate.of(date.getYear(), date.getMonthValue() == 1 ? 12 : date.getMonthValue() - 1 , 1);

localDate[0] = monthSunday;

localDate[1] = lastMonth.with(TemporalAdjusters.lastDayOfMonth());

}

// 整月之后

int day = (int)(localDate[3].toEpochDay() - localDate[0].toEpochDay());

if (lastDayOfMonth.getDayOfWeek().getValue() != DayOfWeek.SATURDAY.getValue()){

localDate[2] = date.with(TemporalAdjusters.firstDayOfNextMonth());

localDate[3] = monthSaturday;

}else if (day == 34){

localDate[2] = date.with(TemporalAdjusters.firstDayOfNextMonth());

localDate[3] =localDate[2].with(TemporalAdjusters.dayOfWeekInMonth(1, DayOfWeek.SATURDAY));

}else if ( day == 27){

localDate[2] = date.with(TemporalAdjusters.firstDayOfNextMonth());

localDate[3] =localDate[2].with(TemporalAdjusters.dayOfWeekInMonth(2, DayOfWeek.SATURDAY));

}

return localDate;

}