读取cer文件

package com.bestpay.bank.agreement.service.citic.settleAccount;

/*

• @author zhujiangtao
• @data 2019/11/29 10:02
  */
  import sun.misc.BASE64Encoder;

import java.io.FileInputStream;
import java.security.PublicKey;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;

public class Cerdemo {

public static void main(String[] args) throws Exception{

    CertificateFactory cf = CertificateFactory.getInstance("X.509");
    X509Certificate cert = (X509Certificate)cf.generateCertificate(new FileInputStream("e:/citic.cer"));
    PublicKey publicKey = cert.getPublicKey();
    BASE64Encoder base64Encoder=new BASE64Encoder();
    String publicKeyString = base64Encoder.encode(publicKey.getEncoded());
    System.out.println("-----------------公钥--------------------");
    System.out.println(publicKeyString);
    System.out.println("-----------------公钥--------------------");
}

}