根據weekNo(本週爲0，上週爲-1，下週爲1),week(Calendar.XXX)獲取日期，以及根據weekNo和week判斷今天是否是該日期

/**
	 * 根據weekNo(本週爲0，上週爲-1，下週爲1),week(Calendar.XXX)獲取日期
	 * @author guandesong
	 * @date 2015-11-4 下午4:57:53
	 * @param week
	 * @return
	 */
	public static String getLastWeekDate(int weekNo,int week){
		Calendar date=Calendar.getInstance(Locale.CHINA);

	    date.setFirstDayOfWeek(Calendar.MONDAY);//將每週第一天設爲星期一，默認是星期天

	    date.add(Calendar.WEEK_OF_MONTH,weekNo);//weekNo本週爲0，上週爲-1，下週爲1,以此類推

	    date.set(Calendar.DAY_OF_WEEK, week);//比如把日子設爲星期天week值爲Calendar.SUNDAY
	    SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd");
	    String weekString = sdf.format(date.getTime());
	    System.out.println(weekString);
	    return weekString;
               
	}
	/**
	 * 根據weekNo和week判斷今天是否是該日期
	 * @author guandesong
	 * @date 2015-11-5 上午11:57:08
	 * @param weekNo
	 * @param week
	 * @return
	 */
	public static boolean todayIsSelectedDate(int weekNo,int week){
		SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd");
	    String weekString = sdf.format(new Date().getTime());
		if(weekString.equals(getLastWeekDate(weekNo,week))){
			return true;
		}else
			return false;
	}