Get public key from X509 certificate

CertificatesTest.java

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

import org.junit.Test;

public class CertificatesTest {

    @Test
    public void getPublickeyFromCertificate() throws CertificateException, FileNotFoundException {
        final String certPath = "from_rest.cert";
        FileInputStream fin = new FileInputStream(certPath);
        CertificateFactory f = CertificateFactory.getInstance("X.509");
        X509Certificate certificate = (X509Certificate)f.generateCertificate(fin);
        PublicKey pk = certificate.getPublicKey();
        System.out.println(pk.toString());
    }
}