It appears there is built in support in the form of a servlet for tomcat (see here), but we use spring heavily in my company. I haven't been able to find any examples of spring/webDav integration. More directly, I'd like to use spring to customize the handling of the various WebDAV methods so it wasn't just reading from a filesystem. I'd like to read from a different data store. Anyone have any experience or know if this is possible?
It is possible. I was looking for the same thing, couldn't find Spring integration with Apache Jackrabbit or Apache Sling but did find it with Milton, see https://milton.io/documentation/
There you can checkout a maven project and see WebDAV (with Spring) in action.