java算法之身份证号码验证

调用时直接

new IDCard().verify(身份证id);就可以了

实现代码如下:

public class IDCard {

      private String _codeError;

      //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];
      private static String[] _areaCode={"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"};
      private static HashMap<String,Integer> dateMap;
      private static HashMap<String,String> areaCodeMap;
      static{
            dateMap=new HashMap<String,Integer>();
            dateMap.put("01",31);
            dateMap.put("02",null);
            dateMap.put("03",31);
            dateMap.put("04",30);
            dateMap.put("05",31);
            dateMap.put("06",30);
            dateMap.put("07",31);
            dateMap.put("08",31);
            dateMap.put("09",30);
            dateMap.put("10",31);
            dateMap.put("11",30);
            dateMap.put("12",31);
            areaCodeMap=new HashMap<String,String>();
            for(String code:_areaCode){
                  areaCodeMap.put(code,null);
            }
      }

      //验证身份证位数,15位和18位身份证
      public boolean verifyLength(String code){
            int length=code.length();
            if(length==15 || length==18){
                  return true;
            }else{
                  _codeError="错误：输入的身份证号不是15位和18位的";
                  return false;
            }
      }

      //判断地区码
      public boolean verifyAreaCode(String code){
            String areaCode=code.substring(0,2);
//            Element child=  _areaCodeElement.getChild("_"+areaCode);
            if(areaCodeMap.containsKey(areaCode)){
                  return true;
            }else{
                  _codeError="错误：输入的身份证号的地区码(1-2位)["+areaCode+"]不符合中国行政区划分代码规定(GB/T2260-1999)";
                  return false;
            }
      }

      //判断月份和日期
      public boolean verifyBirthdayCode(String code){
            //验证月份
            String month=code.substring(10,12);
            boolean isEighteenCode=(18==code.length());
            if(!dateMap.containsKey(month)){
                  _codeError="错误：输入的身份证号"+(isEighteenCode?"(11-12位)":"(9-10位)")+"不存在["+month+"]月份,不符合要求(GB/T7408)";
                  return false;
            }
            //验证日期
            String dayCode=code.substring(12,14);
            Integer day=dateMap.get(month);
            String yearCode=code.substring(6,10);
            Integer year=Integer.valueOf(yearCode);

            //非2月的情况
            if(day!=null){
                  if(Integer.valueOf(dayCode)>day || Integer.valueOf(dayCode)<1){
                        _codeError="错误：输入的身份证号"+(isEighteenCode?"(13-14位)":"(11-13位)")+"["+dayCode+"]号不符合小月1-30天大月1-31天的规定(GB/T7408)";
                        return false;
                  }
            }
            //2月的情况
            else{
                  //闰月的情况
                  if((year%4==0&&year%100!=0)||(year%400==0)){
                        if(Integer.valueOf(dayCode)>29 || Integer.valueOf(dayCode)<1){
                              _codeError="错误：输入的身份证号"+(isEighteenCode?"(13-14位)":"(11-13位)")+"["+dayCode+"]号在"+year+"闰年的情况下未符合1-29号的规定(GB/T7408)";
                              return false;
                        }
                  }
                  //非闰月的情况
                  else{
                        if (Integer.valueOf(dayCode) > 28 || Integer.valueOf(dayCode) < 1) {
                              _codeError="错误：输入的身份证号"+(isEighteenCode?"(13-14位)":"(11-13位)")+"["+dayCode+"]号在"+year+"平年的情况下未符合1-28号的规定(GB/T7408)";
                              return false;
                        }
                  }
            }
            return true;
      }

      //验证身份除了最后位其他的是否包含字母
      public boolean containsAllNumber(String code) {
            String str="";
            if(code.length()==15){
                  str=code.substring(0,15);
            }else if(code.length()==18){
                  str=code.substring(0,17);
            }
            char[] ch = str.toCharArray();
            for (int i = 0; i < ch.length; i++) {
                  if (! (ch[i] >= '0' && ch[i] <= '9')) {
                        _codeError="错误：输入的身份证号第"+(i+1)+"位包含字母";
                        return false;
                  }
            }
            return true;
      }

      public String getCodeError(){
            return _codeError;
      }

      //验证身份证
      public boolean verify(String idcard) {
            _codeError="";
            //验证身份证位数,15位和18位身份证
            if(!verifyLength(idcard)){
                return false;
            }
            //验证身份除了最后位其他的是否包含字母
            if(!containsAllNumber(idcard)){
                  return false;
            }

            //如果是15位的就转成18位的身份证
            String eifhteencard="";
            if (idcard.length() == 15) {
                  eifhteencard = uptoeighteen(idcard);
            }else{
                  eifhteencard=idcard;
            }
            //验证身份证的地区码
            if(!verifyAreaCode(eifhteencard)){
                  return false;
            }
            //判断月份和日期
            if(!verifyBirthdayCode(eifhteencard)){
                  return false;
            }
            //验证18位校验码,校验码采用ISO 7064：1983，MOD 11-2 校验码系统
            if(!verifyMOD(eifhteencard)){
                  return false;
            }
            return true;
      }

      //验证18位校验码,校验码采用ISO 7064：1983，MOD 11-2 校验码系统
      public boolean verifyMOD(String code){
            String verify = code.substring(17, 18);
            if("x".equals(verify)){
                  code=code.replaceAll("x","X");
                  verify="X";
            }
            String verifyIndex=getVerify(code);
            if (verify.equals(verifyIndex)) {
                  return true;
            }
//            int x=17;
//            if(code.length()==15){
//                  x=14;
//            }
            _codeError="错误：输入的身份证号最末尾的数字验证码错误";
            return false;
      }

      //获得校验位
      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[i] = Integer.parseInt(k);
                  }

                  for (int i = 0; i < 17; i++) {
                        sum = sum + wi[i] * ai[i];
                  }
                  remaining = sum % 11;
            }

            return remaining == 2 ? "X" : String.valueOf(vi[remaining]);
      }

      //15位转18位身份证
      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;
      }

作者：jason0539

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