exportcert.html
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<TITLE>Exporting a Certificate to a File
(Java Developers Almanac Example)
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<A HREF="../index.html">List of Packages</A>
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<B><A HREF="../java.security.cert/pkg.html">java.security.cert</A></B><font color="#666666" SIZE="-2">
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<B><A HREF="../java.security.cert/pkg.html#Certificates">Certificates</A></B><font color="#666666" SIZE="-2">
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<h3>
e224.
Exporting a Certificate to a File</h3>
See also <a href="../java.security.cert/ImportCert.html" class="eglink"><font size="-1"><b>e225</b> Importing a Certificate from a File</font></a>.
<pre>
// This method writes a certificate to a file. If binary is false, the
// certificate is base64 encoded.
public static void export(java.security.cert.Certificate cert, File file, boolean binary) {
try {
// Get the encoded form which is suitable for exporting
byte[] buf = cert.getEncoded();
FileOutputStream os = new FileOutputStream(file);
if (binary) {
// Write in binary form
os.write(buf);
} else {
// Write in text form
Writer wr = new OutputStreamWriter(os, Charset.forName("UTF-8"));
wr.write("-----BEGIN CERTIFICATE-----\n");
wr.write(new sun.misc.BASE64Encoder().encode(buf));
wr.write("\n-----END CERTIFICATE-----\n");
wr.flush();
}
os.close();
} catch (CertificateEncodingException e) {
} catch (IOException e) {
}
}
</pre>
If the certificate is in the key store, it can exported using <code>keytool</code>:
<pre>
// Export in binary
> keytool -storepass <font color="#0066ff"><i>my-keystore-password</i></font> -alias <font color="#0066ff"><i>myalias</i></font> -export -file <font color="#0066ff"><i>outfilename.cer</i></font>
// Export in text format
> keytool -storepass <font color="#0066ff"><i>my-keystore-password</i></font> -alias <font color="#0066ff"><i>myalias</i></font> -export -rfc -file <font color="#0066ff"><i>outfilename.cer</i></font>
</pre>
Here's an example of the text form of an exported certificate:
<pre>
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
</pre>
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Related Examples
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e223. <a class="eglink" href="CreateCert.html?l=rel">
Creating a New Key Pair and Self-signed Certificate Using keytool
</a>
<br>
e225. <a class="eglink" href="ImportCert.html?l=rel">
Importing a Certificate from a File
</a>
<br>
e226. <a class="eglink" href="ListCertFact.html?l=rel">
Listing All Available Certificate Formats
</a>
<br>
e227. <a class="eglink" href="GetDn.html?l=rel">
Getting the Subject and Issuer Distinguished Names of an X509 Certificate
</a>
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See also:
<a class="eglink" href="/egs/java.security.cert/pkg.html?l=rel#Certification%20Paths">
Certification Paths
</a>
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