calendar 设置时间

		String[] stringYear = new String[3];
		// 获取当前日期时间
		Date nowDate = new Date();
		Calendar cal = Calendar.getInstance();
		cal.setTime(nowDate);
		// 初始化统计年月(系统日期)
		Date dateToday = cal.getTime();
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy");
		String strYear = simpleDateFormat.format(dateToday);
		
		stringYear[0] = String.valueOf(Integer.parseInt(strYear) - 1);
		stringYear[1] = String.valueOf(Integer.parseInt(strYear));
		stringYear[2] = String.valueOf(Integer.parseInt(strYear) + 1);