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Groovy provides a number of Wiki Markup{link:helper methods|http://groovy.codehaus.org/groovy-jdk.html}{link} for working with I/O. All of these work with standard Java Reader/Writer and InputStream/OutputStream and File and URL classes.
The use of closures allows resources to be processed ensuring that things are properly closed irrespective of exceptions. e.g. to iterate through each line of a file the following can be used...

...

Code Block
def count=0, MAXSIZE=100
new File("foo.txt").withReader { reader ->
  while (reader.readLine() != null) {
    if (++count > MAXSIZE) throw new RuntimeException('File too large!')
   }
}

and

Code Block
def fields = ["a":"1", "b":"2", "c":"3"]
new File("foo.ini").withWriter { out ->
    fields.each() { key, value ->
        out.writeLine("${key}=${value}")
    }
}

...