根据传入的时间获取这一周的开始和结束

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首先传入的值是一个毫秒级的13位的Long类型的时间戳

然后用Calendar获取当前周,再获取传入时间的周

然后计算出传入时间的周跟当前周的差值

获取到周的开始时间和结束时间

public Map<String, Long> getBeginDayAndEndDayOfWeek(Long time) {
        Calendar cal = Calendar.getInstance();
        int curWeekOfYear = cal.get(Calendar.YEAR) * 100 + cal.get(Calendar.WEEK_OF_YEAR);
        if (time != null) {
            cal.setTime(new Date(time));
        }

        int weekOfYear = cal.get(Calendar.YEAR) * 100 + cal.get(Calendar.WEEK_OF_YEAR);

        Long beginDayOfWeek = getBeginDayOfWeek(weekOfYear - curWeekOfYear);
        Long endDayOfWeek = getEndDayOfWeek(weekOfYear - curWeekOfYear);

        Map<String, Long> result = new HashMap<>();
        result.put("beginDayOfWeek", beginDayOfWeek);
        result.put("endDayOfWeek", endDayOfWeek);

        return result;
    }

    /**
     * @param num 例如:上一周传-1,本周传0,下一周传1
     **/
    public Long getBeginDayOfWeek(int num) {
        Calendar cal = Calendar.getInstance();
        int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
        if (dayOfWeek == 1) {
            dayOfWeek += 7;
        }
        cal.add(Calendar.DAY_OF_YEAR, 7 * num + 2 - dayOfWeek);
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTimeInMillis();
    }

    /**
     * @param num 例如:上一周传-1,本周传0,下一周传1
     **/
    public Long getEndDayOfWeek(int num) {
        Calendar cal = Calendar.getInstance();
        int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
        if (dayOfWeek == 1) {
            dayOfWeek += 7;
        }
        cal.add(Calendar.DAY_OF_YEAR, 7 * num + 8 - dayOfWeek);
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), 23, 59, 59);
        cal.set(Calendar.MILLISECOND, 999);
        return cal.getTimeInMillis();
    }