Java2Html

@Grapes(
    @Grab(group='de.java2html', module='java2html', version='5.0')
)
import de.java2html.*;
import de.java2html.options.*;

String javaText = '''
/**
 * This is about ClassName.
 * {@link com.yourCompany.aPackage.SuperClass}
 * @author author
 */
public class ClassName extends SuperClass {
  /* This comment may span multiple lines. */
  private int integer = 0;
  public final static char character = 'A';
  // This comment may span only this line
  private String string = "zero";
}
'''

JavaSourceConversionSettings conversionOptions = new JavaSourceConversionSettings(new JavaSourceConversionOptions());
String htmlText = Java2Html.convertToHtmlPage(javaText, conversionOptions);
println (htmlText)

XML Filter and Printer

def filename = "C:\\test.xml" // will create a file on your system here!

def example="""
<contacts>
   <campuscontact>
      <firstname>Jane</firstname>
      <lastname>Doe</lastname>
      <storenumber>123</storenumber>
   </campuscontact>
   <campuscontact>
      <firstname>Mike</firstname>
      <lastname>Jones</lastname>
      <storenumber>789</storenumber>
   </campuscontact>
   <campuscontact>
      <firstname>Joe</firstname>
      <lastname>Smith</lastname>
      <storenumber>555</storenumber>
   </campuscontact>
</contacts>"""

def nodes = new XmlParser().parseText(example)
def filterBy = ['555','123']

inList = nodes.CampusContact.grep {it.StoreNumber.text() in filterBy}
notInList = nodes.CampusContact.grep {!(it.StoreNumber.text() in filterBy)}
assert inList.size() == 2
assert notInList.size() == 1

//or

notInList = nodes.CampusContact.grep {!(it in inList)}
assert notInList.size() == 1

new PrintWriter(filename).with {
    append("<root>\n")
    p = new XmlNodePrinter(delegate)
    p.preserveWhitespace = true
    p.namespaceAware = false
    inList.each { p.print(it) }
    append("</root>").close()
}

/*
<root>
<campuscontact>
  <firstname>Jane</firstname>
  <lastname>Doe</lastname>
  <storenumber>123</storenumber>
</campuscontact>
<campuscontact>
  <firstname>Joe</firstname>
  <lastname>Smith</lastname>
  <storenumber>555</storenumber>
</campuscontact>
</root>
*/

http://groovyconsole.appspot.com/script/447002