身份证号码解析、验证工具3
前两天的进度似乎有些慢,今天加快了一点, 不把每一步说的那么详细了.
==》地区信息的提取
继性别和生日之后,最后一个信息块,只是列出测试如下.
(本文版权属于© 2012 - 2013 予沁安)
==》有效性
这是一个比较大的问题. 前面,我临时性的把不同地方的验证去掉了. 代码原作者也过来, 畅叙了他关于验证的看法. 他是对的, 这种完全验证的方式,根本上说是 DDD的设计思想。不过,想我所说,我知识临时性的去掉,保证测试的单元性。验证的功能,由验证的测试来驱动。而第二点考虑,我的验证打算放在构造器中,也就是说,如果,有任何错误的输入,连第一道门都进不来。
这里,测试和实现都很简单,看起来很多,只是一些罗列,不同的错误场景而已。
- [Subject("身份证,有效性")]
- public class when_create_social_id_with_valid_format {
- private Because of = () => subject = new SocialID("430103123456780020");
- private It should_create_social_properly =
- () => subject.getCardNumber().ShouldEqual("430103123456780020");
- private static SocialID subject;
- }
- [Subject("身份证,有效性")]
- public class when_create_social_id_with_null_string {
- private Because of = () =>exception= Catch.Exception(()=>new SocialID(null));
- private It should_not_allow_to_create =
- () =>exception.ShouldNotBeNull();
- private static SocialID subject;
- private static Exception exception;
- }
- [Subject("身份证,有效性")]
- public class when_create_social_id_with_empty_string {
- private Because of = () => exception = Catch.Exception(() => new SocialID(string.Empty));
- private It should_not_allow_to_create =
- () => exception.ShouldNotBeNull();
- private static SocialID subject;
- private static Exception exception;
- }
- [Subject("身份证,有效性")]
- public class when_create_social_id_with_2_length_string {
- private Because of = () => exception = Catch.Exception(() => new SocialID("12"));
- private It should_not_allow_to_create =
- () => exception.ShouldNotBeNull();
- private static SocialID subject;
- private static Exception exception;
- }
- [Subject("身份证,有效性")]
- public class when_create_social_id_with_20_length_string {
- private Because of = () => exception = Catch.Exception(() => new SocialID("12345678901234567890"));
- private It should_not_allow_to_create =
- () => exception.ShouldNotBeNull();
- private static SocialID subject;
- private static Exception exception;
- }
- [Subject("身份证,有效性")]
- public class when_create_social_id_alphet_length_string {
- private Because of = () => exception = Catch.Exception(() => new SocialID("A23456789012345678"));
- private It should_not_allow_to_create =
- () => exception.ShouldNotBeNull();
- private static SocialID subject;
- private static Exception exception;
- }
实现
- public SocialID(String cardNumber)
- {
- if (string.IsNullOrEmpty(cardNumber))
- throw new ApplicationException("Card Number is empty");
- if (cardNumber.Length != CARD_NUMBER_LENGTH)
- throw new ApplicationException("Card Number Length is wrong.");
- if (!SOCIAL_NUMBER_PATTERN.IsMatch(cardNumber))
- throw new ApplicationException("Card Number has wrong charactor(s).");
- }
==》验证码
验证码是个特殊的有效性检查,较为复杂,我这里,把这部分逻辑代码提炼出来成为一个验证器。
测试极其简单,和实现几乎原封不动。
测试:
- public class when_verify_soical_number:Specification<Verifier>
- {
- Because of = () => { code = subject.verify("43010319791211453"); };
- private It verify_code_should_match =
- () => code.ShouldEqual('4');
- private static char code;
- }
实现
- namespace Skight.eLiteWeb.Domain.Specs.Properties
- {
- public class Verifier
- {
- private static char[] VERIFY_CODE =
- {
- '1', '0', 'X', '9', '8', '7',
- '6', '5', '4', '3', '2'
- };
- /**
- * 18位身份证中,各个数字的生成校验码时的权值
- */
- private static int[] VERIFY_CODE_WEIGHT =
- {
- 7, 9, 10, 5, 8, 4, 2, 1,
- 6, 3, 7, 9, 10, 5, 8, 4, 2
- };
- private static int CARD_NUMBER_LENGTH = 18;
- public char verify(string source)
- {
- /**
- * <li>校验码(第十八位数):<br/>
- * <ul>
- * <li>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;</li>
- * <li>计算模 Y = mod(S, 11)</li>
- * <li>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</li>
- * </ul>
- *
- * @param cardNumber
- * @return
- */
- int sum = 0;
- for (int i = 0; i < CARD_NUMBER_LENGTH - 1; i++)
- {
- char ch = source[i];
- sum += ((int) (ch - '0'))*VERIFY_CODE_WEIGHT[i];
- }
- return VERIFY_CODE[sum%11];
- }
- }
- }
这时候,身份证构造器的完整实现就变成了
- public SocialID(String cardNumber)
- {
- if (string.IsNullOrEmpty(cardNumber))
- throw new ApplicationException("Card Number is empty");
- if (cardNumber.Length != CARD_NUMBER_LENGTH)
- throw new ApplicationException("Card Number Length is wrong.");
- if (!SOCIAL_NUMBER_PATTERN.IsMatch(cardNumber))
- throw new ApplicationException("Card Number has wrong charactor(s).");
- if (cardNumber[CARD_NUMBER_LENGTH - 1] != verifier.verify(cardNumber))
- throw new ApplicationException("Card Number verified code is not match.");
- this.cardNumber = cardNumber;
- }
至此,代码已经很干净了。 是的,还有进一步的改进,如,3个元素(地区,生日,性别)的提炼应该移到构造器中,各个提取的功能就变成了,简单的数据读取。Social 的类型,不是class而是struct,因为这是典型的Value Object。 另外,我把15转18位的部分也去掉了,这可以看作一个Utilit,可以在外部做,不是核心功能。
你,是否能继续了?
最后,欣赏一下测试结果:
完整代码: