java实现解析SM2-DER编码证书_证书解析 java

当前遇到java解析SM2，der编码格式的证书，需要解析里面字段：

package com.common;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.security.NoSuchProviderException;
import java.security.Security;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
 
public class test {
    public static void main(String[] args) {
        Security.addProvider(new BouncyCastleProvider());
        String path="../src/main/resources/certs/oca.cer";
        try {
            FileInputStream fis= new FileInputStream(path);
            CertificateFactory cf =CertificateFactory.getInstance("X.509","BC");
            X509Certificate certificate=(X509Certificate) cf.generateCertificate(fis);
 
            String subjectDN= certificate.getSubjectDN().toString();
            String issuerDN =certificate.getIssuerDN().toString();
            String serialNumber= certificate.getSerialNumber().toString();
 
            System.out.println("subjectDN : "+subjectDN);
            System.out.println("issuerDN :  "+issuerDN);
            System.out.println("serialNumber :  "+serialNumber);
        } catch (FileNotFoundException |CertificateException |NoSuchProviderException e) {
            e.printStackTrace();
        }
 
    }
}