获取某一个月的全部工作日

    public static List<Date> getWorkDates(int year, int month) {
        List<Date> dates = new ArrayList<>();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month - 1);
        cal.set(Calendar.DATE, 1);
        while (cal.get(Calendar.YEAR) == year &&
                cal.get(Calendar.MONTH) < month) {
            int day = cal.get(Calendar.DAY_OF_WEEK);

            if (!(day == Calendar.SUNDAY || day == Calendar.SATURDAY)) {
                dates.add((Date) cal.getTime().clone());
            }
            cal.add(Calendar.DATE, 1);
        }
        return dates;
    }