獲取當前周的每一天

private static List<String> getWeekDay() {
    Calendar calendar = Calendar.getInstance();
    while (calendar.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY) {
        calendar.add(Calendar.DAY_OF_WEEK, -1);
    }
    List<String> list = new ArrayList<>();
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    for (int i = 0; i < 7; i++) {
        list.add(dateFormat.format(calendar.getTime()));
        calendar.add(Calendar.DATE, 1);
    }
    return list;
}