Load, modify, and write an XML document in Groovy

You can just modify the node's value property to modify the values of elements.

/* input:<root>  <foo>    <bar id="test">      test    </bar>    <baz id="test">      test    </baz>  </foo></root>*/def xmlFile = "/tmp/test.xml"def xml = new XmlParser().parse(xmlFile)xml.foo[0].each {     it.@id = "test2"    it.value = "test2"}new XmlNodePrinter(new PrintWriter(new FileWriter(xmlFile))).print(xml)/* output:<root>  <foo>    <bar id="test2">      test2    </bar>    <baz id="test2">      test2    </baz>  </foo></root>*/

If you want to use the XmlSlurper:

//Open filedef xml = new XmlSlurper().parse('/tmp/file.xml')//Edit File e.g. append an element called foo with attribute barxml.appendNode {   foo(bar: "bar value")}//Save Filedef writer = new FileWriter('/tmp/file.xml')//Option 1: Write XML all on one linedef builder = new StreamingMarkupBuilder()writer << builder.bind {  mkp.yield xml}//Option 2: Pretty print XMLXmlUtil.serialize(xml, writer)

Note:XmlUtil can also be used with the XmlParser as used in @John Wagenleitner's example.

References:

• Option 1
• Option 2

There's a pretty exhaustive set of examples for reading/writing XML using Groovy here. Regarding the loading/saving the data to/from a file, the various methods/properties that Groovy adds to java.io.File, should provide the functionality you need. Examples include:

File.write(text)File.textFile.withWriter(Closure closure) 

See here for a complete list of these methods/properties.