A Groovy script that will store the build number of a Jenkins job's last build into a variable

JenkinsGetLastJobBuildNumber.groovy

def address = "http://{jenkinsBase}/job/${jobName}/lastBuild/buildNumber"

try {
    println("${address}")
    def urlInfo = address.toURL()
    response = urlInfo.openConnection()
    if (response.getResponseCode() != 200) {
    	throw new Exception("Unable to connect to " + address) // Throw an exception to get out of loop if response is anything but 200
  	}
    buildNum= response.getInputStream().getText()
  println("buildnum=${buildNum}")
}
catch (Exception ex) {
  println (ex.getMessage()) 
}