/**

*@param date是為則預設今天日期、可自行設定“2013-06-03”格式的日期

*@return  返回1是星期日、2是星期一、3是星期二、4是星期三、5是星期四、6是星期五、7是星期六

*/

public static int getDayofweek(String date){
  Calendar cal = Calendar.getInstance();
//   cal.setTime(new Date(System.currentTimeMillis()));
  if (date.equals("")) {
   cal.setTime(new Date(System.currentTimeMillis()));
  }else {
   cal.setTime(new Date(getDateByStr2(date).getTime()));
  }
   return cal.get(Calendar.DAY_OF_WEEK);
 }



public static Date getDateByStr2(String dd)
 {

  SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
  Date date;
  try {
   date = sd.parse(dd);
  } catch (ParseException e) {
   date = null;
   e.printStackTrace();
  }
  return date;
 }