Please try:
http://ebba.ddns.net/pub/Linux/SlackBui ... gin.tar.xz
http://ebba.ddns.net/pub/Linux/SlackBui ... gin.tar.xz
and:
http://ebba.ddns.net/pub/Linux/SlackBuilds/jre7.tar.xz
http://ebba.ddns.net/pub/Linux/SlackBuilds/jre8.tar.xz
see also:
http://ebba.ddns.net/pub/Linux/SlackBuilds/
Most of these will help you auto-magically download and (re-)package respective latest binary blobs available at upstream sites

EDIT: updated links to new site/locations ;-)