//从 yyyyMMdd 返回 星期几
	public static String getDayAndWeek(String day){
		if(day.length()<8){
			return day;
		}
		   Calendar c = new GregorianCalendar();
		     DateFormatSymbols dfs = new DateFormatSymbols();
		     String[] weeks = dfs.getWeekdays();
		    int year = Integer.parseInt(day.substring(0,4));
		    int month =Integer.parseInt( day.substring(4,6));
		    int day_ = Integer.parseInt( day.substring(6,8));
		    c.set(year, month-1, day_); //Calendar的月从0-11，所以4月是3.
		    c.get(Calendar.DAY_OF_WEEK);
		    String week = weeks[c.get(Calendar.DAY_OF_WEEK)];
		    week = "星期"+week.substring(2);
		    day = day_+ "("+week+")";
		    return day;
	}
//java/8496