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Exporting a Certificate to a File

import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.OutputStreamWriter; import java.io.Writer; import java.nio.charset.Charset; import java.security.KeyStore; import java.security.cert.Certificate; public class Main {   public static void main(String[] argv) throws Exception {     FileInputStream is = new FileInputStream("your.keystore");     KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());     keystore.load(is, "my-keystore-password".toCharArray());     String alias = "myalias";     Certificate cert = keystore.getCertificate(alias);     File file = null;     byte[] buf = cert.getEncoded();     FileOutputStream os = new FileOutputStream(file);     os.write(buf);     os.close();     Writer wr = new OutputStreamWriter(os, Charset.forName("UTF-8"));     wr.write(new sun.misc.BASE64Encoder().encode(buf));     wr.flush();   } }