This post originated from an RSS feed registered with Java Buzz by dion. Original Post: Gravy: Using Ant from Groovy for short non-build scripts Feed Title: techno.blog(Dion) Feed URL: http://feeds.feedburner.com/dion Feed Description: blogging about life the universe and everything tech Latest Java Buzz Posts Latest Java Buzz Posts by dion Latest Posts From techno.blog(Dion)

I recently had to whip out a one/few-off script that took a directory, and recursively grabbed jar files from it, and put all of the classes in one place. I looked at JarJar and Uberjar, but in the end it was easier to whip together a few lines of Groovy to make it happen (although I could have used Ruby, JavaScript/Rhino, Perl, etc etc).

When it came to jar'ing and unjaring files, instead of using the Java APIs, it was easier to just use ant via the AntBuilder. This allowed me in one simple line to use the tasks available there:

ant.unjar(src: file.path, dest: structure[typeOfJar].outputDir)

Example

def buildJar(String typeOfJar) {
	println "Building a jar file for the type: $typeOfJar"
	new java.io.File(structure[typeOfJar].dir).eachFileRecurse { file ->
		try {
			//println file.path
			if (file.path =~ "\\.jar") {
				println "jar xf $file.path $structure[typeOfJar].outputDir";
				ant.unjar(src: file.path, dest: structure[typeOfJar].outputDir)
			}
		} catch (Exception e) {
			println e
		}
	}

	ant.jar(destfile: structure[typeOfJar].jar, basedir: structure[typeOfJar].outputDir)
	ant.delete(dir: structure[typeOfJar].outputDir)
}