根据生日，计算年龄

/**
* @function getAge
* @param birthday：用户孩子的生日
* @description 获取用户孩子的年龄（含年月日）
* @return DateVO：用户年龄
* @author maohuidong
* @date 2017-05-04
*/
public static DateVO getAge(String birthday){
DateVO dateVO = new DateVO();
Date birthDate = null;
try {
birthDate = new SimpleDateFormat("yyyy-MM-dd").parse(birthday);
} catch (ParseException e) {
e.printStackTrace();
}
//生日这天的日历
Calendar birthCalendar = Calendar.getInstance();
birthCalendar.setTime(birthDate);
//今天的日历
Calendar currentCalendar = Calendar.getInstance();
//计算年龄（含年月日）
Integer year = currentCalendar.get(Calendar.YEAR) - birthCalendar.get(Calendar.YEAR);
Integer month = currentCalendar.get(Calendar.MONTH) - birthCalendar.get(Calendar.MONTH);
Integer day = currentCalendar.get(Calendar.DAY_OF_MONTH) - birthCalendar.get(Calendar.DAY_OF_MONTH);
if (day < 0) {
month -= 1;
currentCalendar.add(Calendar.MONTH, -1);
day = day + currentCalendar.getActualMaximum(Calendar.DAY_OF_MONTH);
}
if (month < 0) {
month = (month + 12) % 12;
year--;
}
dateVO.setYear(year);
dateVO.setMonth(month);
dateVO.setDay(day);
return dateVO;
}