java实现根据身份证计算年龄的两种方式

第一种（推荐使用）：

import org.apache.hadoop.hive.ql.exec.UDF;

import java.util.Calendar;

public class GetAge extends UDF {

    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(); // 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
        sfzjh = sf.evaluate(sfzjh);

        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;
    }

    /*public static void main(String[] args) {
       GetAge ga = new GetAge();
       String sfzjh = "360731199701024351";
        int year = Integer.valueOf(sfzjh.substring(6, 10));
        int month = Integer.valueOf(sfzjh.substring(10,12));
        int day = Integer.valueOf(sfzjh.substring(12,14));
        System.out.println(year + ""+month+""+day);
       System.out.println(ga.evaluate("360731970909435"));

    }*/

}


第二种（不推荐使用，有系统bug）：

import org.apache.hadoop.hive.ql.exec.UDF;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class GetAge1 extends UDF {    public String evaluate(String sfzjh) throws ParseException {        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(); // 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        sfzjh = sf.evaluate(sfzjh);        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);            SimpleDateFormat format = new SimpleDateFormat("yyyymmdd");            long millNow = format.parse(yearNow+""+(monthNow < 10 ? 0+""+monthNow :monthNow)+""+(dayNow < 10 ? 0+""+dayNow:dayNow)).getTime();            long mill = format.parse(sfzjh.substring(6,14)).getTime(); //将出生日期转化为毫秒值            long ag = (millNow - mill)/(1000*60*60)/(365*24);            //age = String.valueOf(Math.floor(ag));            age = String.valueOf(ag);        }        return age;    }    /*public static void main(String[] args) throws ParseException {       GetAge1 ag = new GetAge1();        System.out.println(ag.evaluate("360731980102400"));;    }*/}