战争，耳朵和罐子只是ZIP文件。您可以使用解压任务来破解它打开。
你需要在你的榜样成多个任务，打破了unix命令。

How to put this unix command in ant script?

jar -xvf test.ear out.war | jar -x ; cd directory ; jar -xvf ../out.war

Will this work?

<target name="unear">
    <echo>***Un-tarring***</echo>
    <exec executable="jar" outputproperty="noOfFiles">
         <arg value="-xvf" />
         <arg value="test.ear out.war" />
         <arg value="|" />
         <arg value="jar" />
         <arg value="-x" />
         <arg value=";" />
         <arg value="cd directory" />
         <arg value=";" />
         <arg value="jar" />
         <arg value="-xvf" />
         <arg value="../out.war" />
    </exec>
</target>

wars, ears and jars are simply zip files. you can use the unzip task to crack it open. You'll need to break up the unix command in your example into multiple tasks.