Create a Jar file programatically using Groovy

JarMaker.groovy

import java.util.jar.*

def outputFile = "MyLib.jar"
def distDir = "path/to/content/MyLib"

/*Manifest manifest = new Manifest()
manifest.mainAttributes[Attributes.Name.MANIFEST_VERSION] = "1.0"*/

def jar = new JarOutputStream(new File("${new File(distDir).parent}/${outputFile}").newOutputStream()/*, manifest*/)
new File(distDir).eachFileRecurse {
	addFile(it, jar, distDir)
}
jar.close()

def addFile(File file, JarOutputStream jar, distDir){
	def name = file.path.replace('\\', '/').replace(distDir+'/', '')
	if (file.isDirectory())
		if (!name.endsWith('/'))
			name += '/'
	def entry = new JarEntry(name)
	entry.setTime(file.lastModified())
	jar.putNextEntry(entry)
	jar.closeEntry()
}