求读取证书文件信息的源代码示例

Question

朋友，好好看看JCE吧，你要的东西（摘要、签名、对称加解密、非对称加解密、证书解析），在Java的类库手册中都有（除了证书编码），做开发不能自己不动脑子让别人给你现成的。冒犯之处请原谅。

Answer 1

package sample.crypto;import java.io.File;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ByteArrayOutputStream;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.CertificateException;public final class CertificateFileSample
extends Object
{
public static void main(String[] args)
throws IOException,
CertificateException
{
CertificateFactory factory = null;
Certificate certificate = null; for (int i = 0; i<CRYPTOGRAPHERS.length; i++)
{
factory = CertificateFactory.getInstance(
CRYPTOGRAPHERS[i]);
certificate = loadCertificate(
factory,
getCertificateFileName());
System.out.println();
System.out.println(certificate.getClass().getName());
System.out.println();
System.out.println(certificate);
System.out.println();
}
} private static Certificate loadCertificate(
CertificateFactory factory,
String fileName)
throws IOException,
CertificateException
{
FileInputStream inFile = new FileInputStream(fileName);
Certificate certificate =
factory.generateCertificate(inFile);
inFile.close();
return certificate;
} private static String getCertificateFileName()
{
return "cert.cer";
} private static final String[] CRYPTOGRAPHERS =
new String[]
{
"X.509"
}; private CertificateFileSample()
{
super();
}
}