16 attr.appendChild(subAttr);
17 //给Element添加属性数据
18 attr.setAttribute("attrFirstName", "attrFirstValue");
19 root.appendChild(attr);
20 output(xmldoc, null);
21 output(xmldoc, "D:/Test1_Edited.xml");
22 //通过xpath查找某个节点都是输出找到的子节点。
23 attr = (Element)selectSingleNode("/attributes/attribute3",root);
24 //修改找到节点的其中一个属性
25 attr.getAttributeNode("name").setNodeva lue("Hello");
26 output(attr,null);
27 root.getElementsByTagName("attribute3").item(1).setTextContent("This is other test");
28 output(root,null);
29 //删除其中一个子节点
30 root.removeChild(root.getElementsByTagName("attributeWithText").item(0));
31 output(root,null);
32 //通过xpath方式获取一组节点，之后在逐个删除
33 NodeList attrs = selectNodes("/attributes/attribute3", root);
34 for (int i = 0; i < attrs.getLength(); ++i)
35 attrs.item(i).getParentNode().removeChild(attrs.item(i));
36 root.normalize();
37 output(root,null);
38 } catch (ParserConfigurationException e) {
39 } catch (SAXException e) {
40 } catch (IOException e) {
41 }
42 }
43
44 public static void output(Node node, String filename) {
45 TransformerFactory transFactory = TransformerFactory.newInstance();
46 try {
47 Transformer transformer = transFactory.newTransformer();
48 // 设置各种输出属性 www.2cto.com
49 transformer.setOutputProperty("encoding", "gb2312");
50 transformer.setOutputProperty("indent", "yes");
51 DOMSource source = new DOMSource();
52 // 将待转换输出节点赋值给DOM源模型的持有者(holder)
53 source.setNode(node);
54 StreamResult result = new StreamResult();
55 if (filename == null) {
56 // 设置标准输出流为transformer的底层输出目标
57 result.setOutputStream(System.out);
58 } else {
59 result.setOutputStream(new FileOutputStream(filename));
60 }
61 // 执行转换从源模型到控制台输出流
62 transformer.transform(source, result);
63 } catch (TransformerConfigurationException e) {
64 } catch (TransformerException e) {
65 } catch (FileNotFoundException e) {
66 }
67 }
68
69 public static Node selectSingleNode(String express, Object source) {
70 Node result = null;
71 XPathFactory xpathFactory = XPathFactory.newInstance();
72 XPath xpath = xpathFactory.newXPath();
73 try {
74 //对于只是执行单次的xpath查询，可以不通过compile而直接执行。
75 result = (Node) xpath.eva luate(express, source, XPathConstants.NODE);
76 } catch (XPathExpressionException e) {
77 }
78 return result;
79 }
80
81 public static NodeList se