添加到lwburk的解决方案中，要将DOM节点转换为字符串形式，可以使用Transformer：
private static String nodeToString(Node node)throws TransformerException{ StringWriter buf = new StringWriter(); Transformer xform = TransformerFactory.newInstance().newTransformer(); xform.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes"); xform.transform(new DOMSource(node), new StreamResult(buf)); return(buf.toString());}完整的例子：
public static void main(String... args)throws Exception{ String xml = "<A><B><id>0</id></B><B><id>1</id></B></A>"; documentBuilderFactory dbf = documentBuilderFactory.newInstance(); document doc = dbf.newdocumentBuilder().parse(new InputSource(new StringReader(xml))); XPath xPath = XPathFactory.newInstance().newXPath(); Node result = (Node)xPath.evaluate("A/B[id = '1']", doc, XPathConstants.NODE); System.out.println(nodeToString(result));}private static String nodeToString(Node node)throws TransformerException{ StringWriter buf = new StringWriter(); Transformer xform = TransformerFactory.newInstance().newTransformer(); xform.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes"); xform.transform(new DOMSource(node), new StreamResult(buf)); return(buf.toString());}
