公民身份号码是特征组合码,由十七位数字本体码和一位数字校验码组成.排列顺序从左至右依次为:六位数字地址码,八位数字出生日期码,三位数字顺序码和一位数字校验码。
1、地址码
表示编码对象常住户口所在县（市、旗、区）的行政区划代码，按 GB/T 2260 的规定执行。
2、出生日期码
表示编码对象出生的年、月、日，按 GB/T 7408 的规定执行。年、月、日代码之间不用分隔符。
例：某人出生日期为 1966年10月26日，其出生日期码为 19661026。
3、顺序码
表示在同一地址码所标识的区域范围内，对同年、同月、同日出生的人编定的顺序号，顺序码的奇数分配给男性，偶数千分配给女性。
4 、校验码
校验码采用ISO 7064：1983，MOD 11-2 校验码系统。
（1）十七位数字本体码加权求和公式
S = Sum(Ai * Wi), i = 0, ... , 16 ，先对前17位数字的权求和
Ai:表示第i位置上的身份证号码数字值
Wi:表示第i位置上的加权因子
Wi: 7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4 2
（2）计算模
Y = mod(S, 11)
（3）通过模得到对应的校验码
Y: 0 1 2 3 4 5 6 7 8 9 10
校验码: 1 0 X 9 8 7 6 5 4 3 2
下面是java实现的代码
/*
* IDCard.java Created on 2004-11-5 17:03:37
*
*/
package org.yz21.study.idcard;
/**
* @author violin 2004-11-5 17:03:37
* Copyright www.yz21.org 2003-2004
*/
public class IDCard {
// wi =2(n-1)(mod 11)
final int[] wi = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1};
// verify digit
final int[] vi = {1,0,'X',9,8,7,6,5,4,3,2};
private int[] ai = new int[18];
public IDCard() {
}
//verify
public boolean Verify(String idcard) {
if (idcard.length() == 15) {
idcard = uptoeighteen(idcard);
}
if (idcard.length() != 18) {
return false;
}
String verify = idcard.substring(17, 18);
if (verify.equals(getVerify(idcard))) {
return true;
}
return false;
}
//get verify
public String getVerify(String eightcardid) {
int remaining = 0;
if (eightcardid.length() == 18) {
eightcardid = eightcardid.substring(0, 17);
}
if (eightcardid.length() == 17) {
int sum = 0;
for (int i = 0; i < 17; i++) {
String k = eightcardid.substring(i, i + 1);
ai = Integer.parseInt(k);
}
for (int i = 0; i < 17; i++) {
sum = sum + wi * ai;
}
remaining = sum % 11;
}
return remaining == 2 ? "X" : String.valueOf(vi[remaining]);
}
//15 update to 18
public String uptoeighteen(String fifteencardid) {
String eightcardid = fifteencardid.substring(0,6);
eightcardid = eightcardid + "19";
eightcardid = eightcardid + fifteencardid.substring(6,15);
eightcardid = eightcardid + getVerify(eightcardid);
return eightcardid;
}
}
* IDCard.java Created on 2004-11-5 17:03:37
*
*/
package org.yz21.study.idcard;
/**
* @author violin 2004-11-5 17:03:37
* Copyright www.yz21.org 2003-2004
*/
public class IDCard {
// wi =2(n-1)(mod 11)
final int[] wi = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1};
// verify digit
final int[] vi = {1,0,'X',9,8,7,6,5,4,3,2};
private int[] ai = new int[18];
public IDCard() {
}
//verify
public boolean Verify(String idcard) {
if (idcard.length() == 15) {
idcard = uptoeighteen(idcard);
}
if (idcard.length() != 18) {
return false;
}
String verify = idcard.substring(17, 18);
if (verify.equals(getVerify(idcard))) {
return true;
}
return false;
}
//get verify
public String getVerify(String eightcardid) {
int remaining = 0;
if (eightcardid.length() == 18) {
eightcardid = eightcardid.substring(0, 17);
}
if (eightcardid.length() == 17) {
int sum = 0;
for (int i = 0; i < 17; i++) {
String k = eightcardid.substring(i, i + 1);
ai = Integer.parseInt(k);
}
for (int i = 0; i < 17; i++) {
sum = sum + wi * ai;
}
remaining = sum % 11;
}
return remaining == 2 ? "X" : String.valueOf(vi[remaining]);
}
//15 update to 18
public String uptoeighteen(String fifteencardid) {
String eightcardid = fifteencardid.substring(0,6);
eightcardid = eightcardid + "19";
eightcardid = eightcardid + fifteencardid.substring(6,15);
eightcardid = eightcardid + getVerify(eightcardid);
return eightcardid;
}
}
测试代码：
使用的单元测试工具是junit
/*
* IDCardTest.java Created on 2004-11-5 17:32:12
*
*/
package org.yz21.study.idcard;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* @author violin 2004-11-5 17:32:12
* Copyright www.yz21.org 2003-2004
*/
public class IDCardTest extends TestCase {
private String idcard1 = "11010519491231002X";
private String idcard2 = "440524188001010014";
public void testVerify() {
IDCard idcard = new IDCard();
this.assertTrue(idcard.Verify(idcard1));
this.assertTrue(idcard.Verify(idcard2));
}
public static Test suite() {
return new TestSuite(IDCardTest.class);
}
public static void main(String[] args) {
junit.textui.TestRunner.run(suite());
}
}
* IDCardTest.java Created on 2004-11-5 17:32:12
*
*/
package org.yz21.study.idcard;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* @author violin 2004-11-5 17:32:12
* Copyright www.yz21.org 2003-2004
*/
public class IDCardTest extends TestCase {
private String idcard1 = "11010519491231002X";
private String idcard2 = "440524188001010014";
public void testVerify() {
IDCard idcard = new IDCard();
this.assertTrue(idcard.Verify(idcard1));
this.assertTrue(idcard.Verify(idcard2));
}
public static Test suite() {
return new TestSuite(IDCardTest.class);
}
public static void main(String[] args) {
junit.textui.TestRunner.run(suite());
}
}
