【工具类】日期工具类

根据日期获得所在周的日期

/**
 * 根据日期获得所在周的日期
 *
 * @param mdate
 * @return
 */
public static List<Date> dateToWeek(Date mdate) {
    int b = mdate.getDay();
    Date fdate;
    List<Date> list = new ArrayList<Date>();
    Long fTime = mdate.getTime() - b * 24 * 3600000;
    for (int a = 1; a <= 7; a++) {
        fdate = new Date();
        fdate.setTime(fTime + (a * 24 * 3600000));
        list.add(a - 1, fdate);
    }
    return list;
}

根据具体年份周数获取日期范围

/**
 * 根据具体年份周数获取日期范围
 *
 * @param year
 * @param week
 * @param targetNum
 * @return
 */
public static String getWeekDays(int year, int week, int targetNum, String format) {
    // 计算目标周数
    if (week + targetNum > 52) {
        year++;
        week += targetNum - 52;
    } else if (week + targetNum <= 0) {
        year--;
        week += targetNum + 52;
    } else {
        week += targetNum;
    }
    SimpleDateFormat sdf = new SimpleDateFormat(format);
    Calendar cal = Calendar.getInstance();
    // 设置每周的开始日期
    cal.setFirstDayOfWeek(Calendar.MONDAY);
    cal.set(Calendar.YEAR, year);
    cal.set(Calendar.WEEK_OF_YEAR, week);

    cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
    String beginDate = sdf.format(cal.getTime());

    cal.add(Calendar.DAY_OF_WEEK, 6);
    String endDate = sdf.format(cal.getTime());
    return beginDate + "~" + endDate;
}

参考：

https://www.cnblogs.com/mithrandirw/p/8746468.html
https://blog.csdn.net/weixin_40211013/article/details/107310350

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