Method getAgeByIDNumber

src/main/java/util/CommonUtils.java:592–627

根据身份证号获取年龄 @param idNumber @return

(String idNumber)

     * @return
     */
    public static int getAgeByIDNumber(String idNumber){
        int invalidAge = -1;
        String dateStr;
        if (idNumber.length() == 15) {
            dateStr = "19" + idNumber.substring(6, 12);
        } else if (idNumber.length() == 18) {
            dateStr = idNumber.substring(6, 14);
        } else {//默认是合法身份证号，但不排除有意外发生
            return invalidAge;
        }
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
        try {
            Date birthday = simpleDateFormat.parse(dateStr);
            Calendar calendar = Calendar.getInstance();
            if (calendar.getTimeInMillis() - birthday.getTime() < 0L) {
                return invalidAge;
            }
            int yearNow = calendar.get(Calendar.YEAR);
            int monthNow = calendar.get(Calendar.MONTH);
            int dayOfMonthNow = calendar.get(Calendar.DAY_OF_MONTH);
            calendar.setTime(birthday);
            int yearBirthday = calendar.get(Calendar.YEAR);
            int monthBirthday = calendar.get(Calendar.MONTH);
            int dayOfMonthBirthday = calendar.get(Calendar.DAY_OF_MONTH);

            int age = yearNow - yearBirthday;


            if (monthNow <= monthBirthday && monthNow == monthBirthday && dayOfMonthNow < dayOfMonthBirthday || monthNow < monthBirthday) {
                age--;
            }
            return age;
        } catch (ParseException e) {
            return invalidAge;
        }
    }

    /**
     * in 条件