获取上周开始/结束时间

public static Date getBeginDayOfLastWeek() {

   // 开始

   Date date=new Date();

   if (date==null) {

       return null;

   }

   Calendar cal=Calendar.getInstance();

   cal.setTime(date);

   int dayofweek=cal.get(Calendar.DAY_OF_WEEK);

   if (dayofweek==1) {

       dayofweek+=7;

   }

   cal.add(Calendar.DATE, 2-dayofweek-7);

   return getDayStartTime(cal.getTime());

   // 结束

   Calendar cal=Calendar.getInstance();

   cal.setTime(getBeginDayOfLastWeek());

   cal.add(Calendar.DAY_OF_WEEK, 6);

   Date weekEndSta = cal.getTime();

   return getDayEndTime(weekEndSta);

}