Java – ant: jar and zipfileset – copy files from one jar to another

I am currently doing this:

<jar update="yes"
     jarfile="${pwd}/dist/${release}_installer.jar">
   <zipfileset src="${pwd}/dist/app.jar" includes="com/izforge/izpack/panels/**"/>
   <zipfileset src="${pwd}/dist/app.jar" includes="com/xyz/img/logo.png"/>
</jar>

My existing installer jar has been updated to include files extracted from the application jar as needed

So far, it's very good

However, I want to modify the behavior so that the path of the image file is different from the path copied from it:

Currently:

com/izforge/izpack/panels/MyIzPanel.class
com/xyz/img/logo.png

What I want is:

com/izforge/izpack/panels/MyIzPanel.class
blah/img/logo.png

So I need to copy the files, but use < zipfileset > and < jar > in a way that I can modify the directory structure

Is there a way to do this, except to unzip the entire content, copy the file, and then pull it back again?

Edit:

Link to the previous related question: ant task to remove files from a jar

Solution

You can use the fullpath attribute:

<zipfileset src="${pwd}/dist/app.jar"
    includes="com/xyz/img/logo.png" fullpath="blah/img/logo.img"/>

If you need to copy multiple files, you may need to view prefix properties, for example:

<zipfileset src="${pwd}/dist/app.jar"
    includes="**/*.png" prefix="blah/img"/>