Java中身份证号码工具类--Java自学网_JAVA_编程开发_程序员俱乐部

package com.util;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 身份证号码工具
* @author Administrator
*
*/
public class IdentityCardUtils{
/**
  * 根据身份证号，取得其年龄
  * @param idCard 身份证号码
  * @return
  * @throws Exception
  */
public static int getAge(String idCard) throws Exception{
  String idCard18 = IdentityCardUtils.idCard15To18(idCard);
  String birthday = idCard18.substring(6,14);
  birthday = birthday.substring(0,4)+"-"+birthday.substring(4,6)+"-"+birthday.substring(4,8);
  Date bd = IdentityCardUtils.string2Date(birthday);
  return IdentityCardUtils.getBirthDayToAge(bd);
}

/**
  * 将15位身份证号码转18位身份证号码
  * @param id 15位身份证号码
  * @return
  */
public static String idCard15To18(String idCard){
  String Pid = "";
 
  if(idCard.length()==15 && isN(idCard) && idCard!=null){
   idCard = idCard.substring(0,6)+"19"+idCard.substring(6,15);

   int a[] = new int[17];
   for(int i=0;i<17;i++){
    a[i] = Integer.valueOf(idCard.charAt(i)+"").intValue();
   }
   int b[] = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2};
   int c = 0;
   int d = 0;
   for(int i=0;i<17;i++){
    c = a[i]*b[i];
    d = d+c;
   }
   d = d%11;
   String lastNumber = "";
   switch (d) {
   case 0 :
   lastNumber="1";
   break;
   case 1 :
   lastNumber="0";
   break;
   case 2 :
   lastNumber="X";
   break;
   case 3 :
   lastNumber="9";
   break;
   case 4 :
   lastNumber="8";
   break;
   case 5 :
   lastNumber="7";
   break;
   case 6 :
   lastNumber="6";
   break;
   case 7 :
   lastNumber="5";
   break;
   case 8 :
   lastNumber="4";
   break;
   case 9 :
   lastNumber="3";
   break;
   case 10 :
   lastNumber="2";
   break;
   }
  
   Pid = idCard+lastNumber;
  }else{
   Pid = idCard;
  }
  return Pid;
}
/**
  * 将18位身份证号码，恢复为15位
  * @param idCard 18位身份证号码
  * @return
  */
public static String idCard18To15(String idCard){
  if(idCard==null || idCard.length()!=18){
   return idCard;
  }
  return idCard.substring(0,6)+idCard.substring(8,17);
 
}

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/**
  * 判断是否全是数字
  * @param num
  * @return
  */
public static boolean isN(String num){
 
  boolean isNum = num.matches("\\d*");
  return isNum;
}

/**
  * 判断奇偶数
  * @param n
  * @return
  */
public static boolean IsOdd(int n){ return (n % 2 == 1) ? true : false;}

/**
  * 判断是否为合法日期
  * @param str_input
  * @param rDateFormat
  * @return
  */
public static boolean isDate(String str_input){
 
  SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
  formatter.setLenient(false);
  try {
   formatter.format(formatter.parse(str_input));
  } catch (Exception e) {
      return false;
  }
  return true;
}

/**
  * 根据生日得到年龄
  * @param birthDay
  * @return   http://www.javalearns.com/
  * @throws Exception
  */
public static int getBirthDayToAge(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) {
                //monthNow==monthBirth
                if (dayOfMonthNow < dayOfMonthBirth) {
                    age--;
                } else {
                    //do nothing
                }
            } else {
                //monthNow>monthBirth
                age--;
            }
        } else {
            //monthNow<monthBirth
            //donothing
        }

        return age;
    }

/**
     * 将yyyy-MM-dd 类型的字符串转为日期     *
     * @param dateStr
     * @return
     */
    public static Date string2Date(String dateStr) {
        if (dateStr != null && !"".equals(dateStr)) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            try {
                return sdf.parse(dateStr);
            } catch (Exception e) {
                System.out.println(e);
            }
        }
        return null;
    }
   
   public static void main(String[] args){
    String id = "110108800127491";
    String id18 = IdentityCardUtils.idCard15To18(id);
    System.out.println(id18);
    String id1 = IdentityCardUtils.idCard18To15(id18);
    System.out.println(id1);
   }
} 

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