网上关于国密算法的资料较单一，大部分代码都是写的怎么通过java代码生成公私钥串。

实际项目中对方已经给了他们的公钥证书，这里记录如何通过代码解析获得Ecpoint对象并输出

关键代码

String cerPath="E:\\test.cer";                               

X509Certificate x509Certificate = null;                       

#国密证书使用了自有的椭圆曲线，无法使用JDK自带的java.security解析证书，需要引入BouncyCastle的BC库支持国密算法

Security.addProvider(new BouncyCastleProvider());        

#如果不引入BC库这里会报java.security.NoSuchProviderException: no such provider: BC错误

CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509","BC");     

FileInputStream fileInputStream = new FileInputStream(cerPath);

x509Certificate = (X509Certificate) certificateFactory.generateCertificate(fileInputStream);

fileInputStream.close();

System.out.println("证书序列号："+ x509Certificate.getSerialNumber());

#这里有个坑，bcprov-jdk15on需1.59以上的版本，之前引的是1.54版一直报错

System.out.println("证书公钥："+ x509Certificate.getPublicKey());

输出

证书序列号：534384516521

证书公钥：EC Public Key [de:38:a5:b6:6f:8b:f7:34:5f:72:1c:af:0c:14:e5:a2:84:fa:e2:c3]

            X: 2f05a01e62336c889009b4174d1ec550de327db602ae49a29ebaa4c258633556

            Y: cea688f06328d4616685d5cfd575de8e5e8b6de7f5bfc1d273c3562159a5f3f

依赖库

<dependency>

<groupId>org.bouncycastle</groupId>

<artifactId>bcprov-jdk15on</artifactId>

<version>1.59</version>

</dependency>