Java根据身份证号或者出生日期计算年龄

1.根据身份证号计算年龄
import java.util.Calendar;
public String evaluate(String sfzjh){
if(sfzjh == null || “”.equals(sfzjh) ){
return “身份证件号有误,没法计算年龄”;
}
if (sfzjh.length() != 15 && sfzjh.length() != 18){
return “身份证件号有误,没法计算年龄”;
}
String age=“身份证件号有误,没法计算年龄”;
/CheckSFZ sf = new CheckSFZ();
sfzjh = sf.evaluate(sfzjh);/
// 调用校验身份证的函数，若身份证彻底正确，此处能够不须要
if(sfzjh != “身份证件号有误”){
Calendar cal = Calendar.getInstance();
int yearNow = cal.get(Calendar.YEAR);
int monthNow = cal.get(Calendar.MONTH)+1;
int dayNow = cal.get(Calendar.DATE);
int year = Integer.valueOf(sfzjh.substring(6, 10));
int month = Integer.valueOf(sfzjh.substring(10,12));
int day = Integer.valueOf(sfzjh.substring(12,14));
if ((month < monthNow) || (month == monthNow && day<= dayNow) ){
age = String.valueOf(yearNow - year);
} else {
age = String.valueOf(yearNow - year-1);
}
}
return age;
}
2.根据出生日期计算年龄
public static Date parse(String strDate) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);
return sdf.parse(strDate);
}
//由出生日期获得年龄
public static int getAge(Date birthDay) throws Exception {
Calendar cal = Calendar.getInstance();
if (cal.before(birthDay)) {
throw new IllegalArgumentException(
“The birthDay is before Now.It’s unbelievable!”);
}
int yearNow = cal.get(Calendar.YEAR);
int monthNow = cal.get(Calendar.MONTH);
int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);
cal.setTime(birthDay);
int yearBirth = cal.get(Calendar.YEAR);
int monthBirth = cal.get(Calendar.MONTH);
int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);
int age = yearNow - yearBirth;
if (monthNow <= monthBirth) {
if (monthNow == monthBirth) {
if (dayOfMonthNow < dayOfMonthBirth) age–;
}else{
age–;
}
}
return age;
}