Well, the truth is, there is no one step way to do this. This is what users tend to do:
- Extract the Jar file
- Delete the Jar file
- Run the Jar command to re-create the Jar file.
So yeah, I can make a batch file for this but since I have no idea how to make one, I decided to use Ant.
Here is my script.
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<?xml version="1.0" encoding="UTF-8"?> <project name="recreate-jar" default="list_jarfiles" basedir="."> <taskdef resource="net/sf/antcontrib/antcontrib.properties"/> <target name="list_jarfiles" description="list jar files in all subfolders"> <foreach target="rejar" param="the_file"> <path> <fileset id="dist.contents" dir="." includes="**/*.jar"/> </path> </foreach> </target> <target name="rejar" description="unsigns signed jar file"> <basename property="the_file.filename" file="${the_file}"/> <dirname property="absolute.path" file="${the_file}"/> <property name="folder_name" value="${absolute.path}_folder"/> <!-- delete folder for extracted jar file if exists before proceeding to recreate folder and extract jar contents. the folder name should be like JARNAME_folder --> <if> <available file="${folder_name}" type="dir" /> <then> <delete includeemptydirs="true"> <fileset dir="${folder_name}" includes="**/**"/> </delete> </then> </if> <mkdir dir="${folder_name}" /> <!-- extract all jar file contents to folder --> <unzip src="${the_file}" dest="${folder_name}"/> <!-- delete jar file --> <delete file="${the_file}" /> <!-- create jar file using custom manifest. make sure you change the path if ever the folder is different in your workstation. --> <jar destfile="${the_file}" duplicate="preserve" manifest="manifest.mf" basedir="${folder_name}" excludes="META-INF/**" includes="**" > </jar> <!-- after creating jar, delete folder of extracted files --> <delete includeemptydirs="true"> <fileset dir="${folder_name}" includes="**/**"/> </delete> </target> </project> |
The following explains the steps that the build script executes:
- Go over all folders recursively to look for existing jar files.
- Extracts them one by one in a folder name that is the name of the Jar file + “_folder”.
- Delete the old Jar file
- Re-create the Jar file
- Delete the folder
That’s it! Simply put the build script file in any folder you want it to start searching for Jar files and it does the rest.
