Write XML response to a file

I have the code as a 'script assertion' in the XML file. I have now changed this to an event handler but i cannot see any logs. I am attempting to use dates/times as a directory structure do to the sheer volume of tests that we run. Can anyone see a problem with the below event handler?

//new File(directory).mkdirs() 

def time() {
  date = new Date()
  dateFormat = new java.text.SimpleDateFormat('HH-mm-ss-SSS')
  shortDateName = dateFormat.format(date)  
  return shortDateName
}

def date() {
  date = new Date()
  dateFormat = new java.text.SimpleDateFormat('ddMMyyyy')
  shortDateName = dateFormat.format(date)  
  return shortDateName
}
def directory = "C:/SoapOutput/" + date() + "/"+ time()

fos = new FileOutputStream( directory + testStepResult.testStep.label + '.txt', true )
pw = new PrintWriter( fos )
testStepResult.writeTo( pw )
pw.close()
fos.close()