DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();        try {            DocumentBuilder builder = factory.newDocumentBuilder();            Document doc = builder.parse("tree.xml");            //根据标签名获取节点集合            NodeList nodeList  = doc.getElementsByTagName("item");            for (int i = 0; i < nodeList.getLength(); i++) {                //获取单个节点                Node node = nodeList.item(i);                //获取节点属性集合                NamedNodeMap attrs = node.getAttributes();                //遍历属性                for (int j = 0; j < attrs.getLength(); j++) {                    Node attr = attrs.item(j);                    System.out.println("属性名："+attr.getNodeName());                    System.out.println("属性值："+attr.getNodeValue());                }//                //节点转化为Element对象获取属性值//                Element ele = (Element)node;//                System.out.println("属性值："+ele.getAttribute("id"));                //获取子节点集合                NodeList childList = node.getChildNodes();                for (int k = 0; k < childList.getLength(); k++) {                    Node child = childList.item(k);                    //判断子节点类型为Element类型非Text文本类型                    if (child.getNodeType() == Node.ELEMENT_NODE) {                        System.out.println("节点间文本："+child.getTextContent());                        //或                        System.out.println("节点间文本："+child.getFirstChild().getNodeValue());                        //注：child.getNodeValue()不能获取节点间文本，因节点间文本为节点的子级，是其子节点的NodeValue                    }                }            }        } catch (ParserConfigurationException e) {            e.printStackTrace();        } catch (SAXException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }