title: Read a file into a Maven property
body: <p>Is it possible to read a file and store the entire contents into a Maven property?</p>
  
  <p>I'm trying to generate some custom JavaDocs, and they have an option to set a header, but it has to be a string, not a file name (for some reason). I obviously don't want to put a bunch of HTML into my pom.xml, so I need a way to read my <code>header.html</code> as a Maven property.</p>
  
  <p>Is this possible? I'm not able to find a standard way, but it seems like a Maven plugin might do this.</p>
  
  <p>Apparently <a href="http://ant.apache.org/manual/Tasks/loadfile.html" rel="noreferrer">Ant has what I want</a>, but I'd prefer something lighter weight than the Ant task.</p>