java获取本周时间戳

/**
	 * start
	 * 本周开始时间戳 - 以星期一为本周的第一天
	 */
	public  long getWeekStartTime() {
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat( "yyyyMMdd", Locale. getDefault());
		Calendar cal = Calendar.getInstance();
		cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0,
				0, 0);
		int day_of_week = cal.get(Calendar. DAY_OF_WEEK) - 1;
		if (day_of_week == 0 ) {
			day_of_week = 7 ;
		}
		cal.add(Calendar.DATE , -day_of_week + 1 );
		return  cal.getTime().getTime();
	}
	/**
	 * end
	 * 本周结束时间戳 - 以星期一为本周的第一天
	 */
	public  long getWeekEndTime() {
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat( "yyyyMMdd", Locale. getDefault());
		Calendar cal = Calendar.getInstance();
		cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 23,
				59, 59);
		int day_of_week = cal.get(Calendar. DAY_OF_WEEK) - 1;
		if (day_of_week == 0 ) {
			day_of_week = 7 ;
		}
		cal.add(Calendar.DATE , -day_of_week + 7 );
		return  cal.getTime().getTime() ;
	}

之前踩了个坑，周日生成出来是下周一和周日的时间戳，找了好久找到这篇
https://blog.youkuaiyun.com/zhuwentao2150/article/details/52084642
稍微修改了一点我需要的格式 记录一下