string字符串得到生日

public static int getAge(Date birth, Date to) {
		Calendar birthCal = Calendar.getInstance();
		if (birth == null) {
			return -1;
		}
		birthCal.setTime(clearTime(birth));
		Calendar toCal = Calendar.getInstance();
		toCal.setTime(clearTime(to));
		int years = toCal.get(Calendar.YEAR) - birthCal.get(Calendar.YEAR);
		Calendar tempCal = Calendar.getInstance();
		tempCal.setTime(birthCal.getTime());
		tempCal.set(Calendar.YEAR, toCal.get(Calendar.YEAR));
		if (tempCal.getTime().getTime() / dayValue - toCal.getTime().getTime()
				/ dayValue > 0) {
			years = years - 1;
		}
		return years;
	}

　　

private static int getAge(String birthDate) throws Exception { SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); Calendar calBirth = Calendar.getInstance(); calBirth.setTime(sdf.parse(birthDate)); Calendar cal = Calendar.getInstance(); int yearDiff = cal.get(Calendar.YEAR) - calBirth.get(Calendar.YEAR); calBirth.add(Calendar.YEAR, yearDiff); if (cal.getTimeInMillis() - calBirth.getTimeInMillis() < 0) { return yearDiff - 1; } return yearDiff; }