这是我能想到的***答案:

Here's the best answer I've been able to come up with:

<delete includeemptydirs="true">
  <fileset dir="${dirToStartFrom}"  >
    <and>
      <size value="0"/>
      <type type="dir"/>
     </and>
  </fileset>
</delete>

然后我将它包装在一个宏中，以便我可以从任何目标传入目录名称:

I then wrapped it in a macro so I can pass the dir name in from any target:

<!-- Find and delete empty folders under dir -->
<macrodef name="deleteEmptyFolders">
    <attribute name="dir"/>
    <sequential>
        <delete includeemptydirs="true">
            <fileset dir="@{dir}"  >
                <and>
                    <size value="0"/>
                    <type type="dir"/>
                </and>
            </fileset>
        </delete>
    </sequential>
</macrodef>

像这样:

<target name="clean">
  <deleteEmptyFolders dir="build"/>
  <deleteEmptyFolders dir="common"/>
  <deleteEmptyFolders dir="lib"/>
</target>