かずひらさんから拝借
XmlSlurper slurper = new groovy.util.XmlSlurper()
String url = "http://yyyank.blogspot.com/feeds/posts/default?max-results=1"
slurper.parse(url)
.children()
.grep{it.name() == "entry"}
.each{println("${it.published.text()}:${it.title.text()}")}