java根据生日获取年龄 java根据身份证计算年龄

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;
 }