A Groovy code to recuse every file (of specific type) in a directory

resurseFile.groovy

import groovy.io.FileType

File fooDirectory = new File("/some-path-to-the-parent-directory")

// Recurse only *.html file (for example)
def reportNamePattern = ~/.*\.html/
fooDirectory.eachFileMatch(FileType.FILES, reportNamePattern) { File myFile ->
    // Use myFile as you want
    println myFile.name
}