JAVA 根据身份证计算年龄的实现代码

下面一段代码给大家分享java根据身份证计算年龄的方法，具体代码如下所示：

birthdate = idcard.substring(6,10)+"-"+idcard.substring(10,12)+"-"+idcard.substring(12,14)
public static int getagefrombirthtime(string birthtimestring){
 // 先截取到字符串中的年、月、日
 string strs[] = birthtimestring.trim().split("-");
 int selectyear = integer.parseint(strs[0]);
 int selectmonth = integer.parseint(strs[1]);
 int selectday = integer.parseint(strs[2]);
 // 得到当前时间的年、月、日
 calendar cal = calendar.getinstance();
 int yearnow = cal.get(calendar.year);
 int monthnow = cal.get(calendar.month) + 1;
 int daynow = cal.get(calendar.date);
 // 用当前年月日减去生日年月日
 int yearminus = yearnow - selectyear;
 int monthminus = monthnow - selectmonth;
 int dayminus = daynow - selectday;
 int age = yearminus;
 if (yearminus < 0) {// 选了未来的年份
  age = 0;
 } else if (yearminus == 0) {// 同年的，要么为1，要么为0
  if (monthminus < 0) {// 选了未来的月份
   age = 0;
  } else if (monthminus == 0) {// 同月份的
   if (dayminus < 0) {// 选了未来的日期
    age = 0;
   } else if (dayminus >= 0) {
    age = 1;
   }
  } else if (monthminus > 0) {
   age = 1;
  }
 } else if (yearminus > 0) {
  if (monthminus < 0) {// 当前月>生日月
  } else if (monthminus == 0) {// 同月份的，再根据日期计算年龄
   if (dayminus < 0) {
   } else if (dayminus >= 0) {
    age = age + 1;
   }
  } else if (monthminus > 0) {
   age = age + 1;
  }
 }
 return age;
}

下面在看下java根据出生日期获得年龄

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--; 
   } 
  } 
  system.out.println("age:"+age); 
  return age; 
 }

总结

以上所述是小编给大家介绍的java 根据身份证计算年龄，希望对大家有所帮助