Java实现身份证号码验证源码示例分享

整理文档，搜刮出一个Java实现身份证号码验证源码示例代码，稍微整理精简一下做下分享。

package xxx;



import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;


public class IDCardUtil
{
  
  final static String CITY_CODE[] = {"11", "12", "13", "14", "15", "21", "22", "23", "31", "32", "33", "34", "35", "36", "37", "41", "42", "43", "44", "45", "46", "50", "51", "52", "53", "54", "61", "62", "63", "64", "65", "71", "81", "82", "91"};

  
  final static char[] PARITYBIT = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};

  
  final static int[] POWER = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};

  
  public final static boolean isValid(String id)
  {
    if (id == null)
      return false;

    int len = id.length();
    if (len != 15 && len != 18)
      return false;

    //校验区位码
    if (!validCityCode(id.substring(0, 2)))
      return false;

    //校验生日
    if (!validDate(id))
      return false;

    if (len == 15)
      return true;

    //校验位数
    return validParityBit(id);

  }

  private static boolean validParityBit(String id)
  {
    char[] cs = id.toUpperCase().toCharArray();
    int power = 0;
    for (int i = 0; i < cs.length; i++)
    {
      //最后一位可以是X
      if (i == cs.length - 1 && cs[i] == 'X')
 break;

      // 非数字
      if (cs[i] < '0' || cs[i] > '9')
 return false;

      // 加权求和
      if (i < cs.length - 1)
      {
 power += (cs[i] - '0') * POWER[i];
      }
    }
    return PARITYBIT[power % 11] == cs[cs.length - 1];
  }

  private static boolean validDate(String id)
  {
    try
    {
      String birth = id.length() == 15 ? "19" + id.substring(6, 12) : id.substring(6, 14);
      SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
      Date birthDate = sdf.parse(birth);
      if (!birth.equals(sdf.format(birthDate)))
 return false;
    }
    catch (ParseException e)
    {
      return false;
    }
    return true;
  }

  private static boolean validCityCode(String cityCode)
  {
    for (String code : CITY_CODE)
    {
      if (code.equals(cityCode))
 return true;
    }
    return false;
  }

  
  final public static String id15To18(String id)
  {
    if (id == null || id.length() != 15)
      return null;

    if (!isValid(id))
      return null;

    String id17 = id.substring(0, 6) + "19" + id.substring(6);

    int power = 0;
    char[] cs = id17.toCharArray();
    for (int i = 0; i < cs.length; i++)
    {
      power += (cs[i] - '0') * POWER[i];
    }

    // 将前17位与第18位校验码拼接
    return id17 + String.valueOf(PARITYBIT[power % 11]);
  }

  
  public static int rand(int min, int max)
  {
    Random random = new Random();
    return random.nextInt(max + 1) % (max - min + 1) + min;
  }

  public final static String generateID()
  {
    // 地址码
    String body = CITY_CODE[rand(0, CITY_CODE.length - 1)] + "0101";

    // 出生年
    String y = String.valueOf(rand(1950, Calendar.getInstance().get(Calendar.YEAR)));
    String m = String.valueOf(rand(1, 12));
    if (m.length() == 1)
      m = "0" + m;
    String d = String.valueOf(rand(1, 28));
    if (d.length() == 1)
      d = "0" + d;

    String idx = String.valueOf(rand(1, 999));
    if (idx.length() == 1)
      idx = "00" + idx;
    else if (idx.length() == 2)
      idx = "0" + idx;

    body += y + m + d + idx;

    // 累加body部分与位置加权的积
    int power = 0;
    char[] cs = body.toCharArray();
    for (int i = 0; i < cs.length; i++)
    {
      power += (cs[i] - '0') * POWER[i];
    }

    // 得出校验码

    return body + String.valueOf(PARITYBIT[power % 11]);
  }
}

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