The directory where the keystore is …
cd /usr/java/jre/lib/security

To list keys currently in the keystore …
keytool -list -keystore cacerts

Assuming cert has been exported (via browser) to file mycert.x509 …
To import that key into the keystore:
(default password of the keystore is: changeit) …
keytool -import -noprompt -trustcacerts -alias www.yoursite.com -file mycert.x509 -keystore cacerts

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