Find and extract file in zip

unzip.groovy

import groovy.io.FileType

String targetFileName = 'someFileName'
String filter = 'someFilter'

def dir = new File(".")

dir.eachFileRecurse(FileType.FILES){ file ->       
  if (file.name.endsWith(filter)) {	   
    def zipFile = new java.util.zip.ZipFile(file)
    zipFile.entries().each{ entry ->
      if(entry.name.indexOf(targetFileName) > 0){
        def out = new BufferedOutputStream(new FileOutputStream(entry.name))
        out << zipFile.getInputStream(entry)
        out.close()			
      }	   
    }
  }
}