http://ant.apache.org/manual/Tasks/copydir.html
<copydir src="${base.path}/lib/"
dest="${build.path}/lib"
/>
<copydir src="${base.path}/images/"
dest="${build.path}/images"
/>
<copydir src="${base.path}/src/com/"
dest="${build.path}/com"
/>
<copydir src="${base.path}/Meta-INF/"
dest="${build.path}/Meta-INF"
/>
http://ant.apache.org/manual/Tasks/jar.html
<jar destfile="project.jar"
basedir="${build.path}"
includes="**/*.*"
/>