根据日期判断是这一周的第几天

   

String today = "2010-08-15";
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    Date date = format.parse(today);
    Calendar calendar = Calendar.getInstance();
    calendar.setFirstDayOfWeek(Calendar.MONDAY);//设置每周的第一天为周一
    calendar.setTime(date);
    System.out.println(calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println(calendar.get(Calendar.DAY_OF_WEEK));