如何序列化/反序列化X509Certificate

Question

I see there is code to read one in here

https://docs.oracle.com/javase/8/docs/api/java/security/cert/X509Certificate.html

but there is no code for writing one out.

My preference is to write a String and read a String or else I will have to base64 encode. Anyways, how to serialize it?

thanks, Dean

Answer 1

Use this to write a certificate as binary

Files.write(
      Paths.get(fileName),
      certificate.getEncoded());

And this code will write the certificate to base64

 Files.write(
      Paths.get(fileName),
      Base64.getEncoder().encode(certificate.getEncoded()));

If you need a PEM file, just add -----BEGIN CERTIFICATE----- header and -----END CERTIFICATE----- footer to the base64 file

Java supports reading certificates encoded in PEM or binary format