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public static void main(String[] args) throws ParserConfigurationException,
SAXException, IOException, XPathExpressionException {
// DocumentBuilderFactory domFactory = DocumentBuilderFactory
// .newInstance();
// domFactory.setNamespaceAware(true); // never forget this!
// DocumentBuilder builder = domFactory.newDocumentBuilder();
// Document doc = builder.parse("c:/solr.xml");
// XPathFactory factory = XPathFactory.newInstance();
// XPath xpath = factory.newXPath();
// Node nd = (Node)xpath.evaluate("solr/cores/@adminPath", doc, XPathConstants.NODE);
// String txt = nd.getNodeValue();
// System.out.println(txt);
//
// //多核循环读取，属性读取
// XPath mulXpath = factory.newXPath();
// Object o = mulXpath.evaluate("solr/cores/core", doc, XPathConstants.NODESET);
// NodeList nodes = (NodeList) o;
// for (int i = 0; i < nodes.getLength(); i++) {
// Node node = nodes.item(i);
// Node aNode =(Node) node.getAttributes().getNamedItem("name");
// System.out.println(aNode.getNodeValue());
// // String opt = DOMUtil.getAttr(node, "name", null);
// // System.out.println(opt);
// System.out.println(node.getNodeName());
// Node eNode = node.getFirstChild();
// System.out.println(eNode.getNodeValue());
// System.out.println(node.getNodeType());
// }
String strXml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><class><stu><id>1,2,3</id></stu></class>";

DocumentBuilderFactory domFactory = DocumentBuilderFactory
.newInstance();
domFactory.setNamespaceAware(true); // never forget this!
DocumentBuilder builder = domFactory.newDocumentBuilder();
InputStream inputStream = new ByteArrayInputStream(strXml.getBytes());;
Document doc = builder.parse(inputStream);
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
//Node nd = (Node)xpath.evaluate("class/stu/@id", doc, XPathConstants.NODE);
//String txt = nd.getNodeValue();
// System.out.println(txt);

//多核循环读取，属性读取
XPath mulXpath = factory.newXPath();
Object o = mulXpath.evaluate("class/stu/id", doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) o;
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
// Node aNode =(Node) node.getAttributes().getNamedItem("name");
// System.out.println(aNode.getNodeValue());
// String opt = DOMUtil.getAttr(node, "name", null);
// System.out.println(opt);
System.out.println(node.getNodeName());
Node eNode = node.getFirstChild();
System.out.println(eNode.getNodeValue());
System.out.println(node.getNodeType());
}
}