java 获取某月份的具体天数（含润年不润年）

		//方法1
		String strDate = "2012-02"; 
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM"); 
		Calendar calendar = new GregorianCalendar(); 
		Date date1 = sdf.parse(strDate); 
		calendar.setTime(date1); //放入你的日期 
		System.out.println("天数为=" + calendar.getActualMaximum(Calendar.DAY_OF_MONTH)); 
		
		//方法2
		System.out.println("天数为=" + new Date(2007,02,0).getDate());