You can uses WebDAV in Confluence, if you can get Joomla or Wordpress to export the pages you can easily upload them to Confluence via WebDAV.
https://confluence.atlassian.com/display/DOC/Configuring+a+WebDAV+client+for+Confluence
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Once you've imported to Confluence and miss the theming capabilities, check out Scroll Viewport. It provides for simple content theming for Confluence (no need to deal with overly complex Confluence theming infrastructure).
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