public static Date getLastWeekSunday(){
Calendar date=Calendar.getInstance(Locale.CHINA);
date.setFirstDayOfWeek(Calendar.MONDAY);//将每周第一天设为星期一,默认是星期天
date.add(Calendar.WEEK_OF_MONTH,-1);//周数减一,即上周
date.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);//日子设为星期天
return date.getTime();
}