ant task to remove files from a jar

问题:

How to write an ant task that removes files from a previously compiled JAR?

Let's say the files in my JAR are:

aaa/bbb/ccc/Class1
aaa/bbb/ccc/Class2
aaa/bbb/def/Class3
aaa/bbb/def/Class4

... and I want a version of this JAR file without the aaa.bbb.def package, and I need to strip it out using ant, such that I end up with a JAR that contains:

aaa/bbb/ccc/Class1
aaa/bbb/ccc/Class2

Thanks!

回答1:

Have you tried using the zipfileset task?

<jar destfile="stripped.jar">
    <zipfileset src="full.jar" excludes="files/to/exclude/**/*.file"/>
</jar>

---

For example:

<property name="library.dir" value="dist"/>
<property name="library.file" value="YourJavaArchive.jar"/>
<property name="library.path" value="${library.dir}/${library.file}" />
<property name="library.path.new" value="${library.dir}/new-${library.file}"/>

<target name="purge-superfluous">
    <echo>Removing superfluous files from Java archive.</echo>

    <jar destfile="${library.path.new}">
        <zipfileset src="${library.path}" excludes="**/ComicSans.ttf"/>
    </jar>

    <delete file="${library.path}" />
    <move file="${library.path.new}" tofile="${library.path}" />
</target>

回答2:

You have to unjar and rejar.

<unzip src="myjar.jar" dest="/classes/">
<jar destfile="newjar.jar"
    basedir="/classes/"
    includes="**/*"
    excludes="**/def/*"
/>    

回答3:

If a jar-file capable archiver program, like e.g. "zip" on Linux, is available, the task can be done by

<exec executable="zip">            
<arg value="-d"/>            
<arg value="myJarCopyToStrip.jar"/>            
<arg value="aaa/bbb/def/*>            
<arg value="aaa/bbb/def>
</exec>

Subtree deletion depends on the capabilities of the used archiver.
The "os" attribute of the Ant "exec" task allows to use different archivers on different OS's.

回答4:

I came here looking to use ant as a workaround some short comings in gradle unzip.

On the off chance someone else is in the same boat.

Here is an example:

    task antUnzip() << {

            ant.jar(destfile : "stripped.jar") {
                zipfileset (src : "full.jar", excludes : "files/to/exclude/**/*.file") {
                }
            }
}

回答5:

I am not sure if there a direct solution for your requirement. I would recommend to explode the jar to some temp directory and then remove unwanted class files. Finally create a new jar with required class files.

Reference links:

http://ant.apache.org/manual/Tasks/unzip.html

http://ant.apache.org/manual/Tasks/delete.html

http://ant.apache.org/manual/Tasks/jar.html