java用dom更新xml的问题，怎么在子节点下添加节点？

Question

有原始xml如下: <?xml version="1.0" encoding="UTF-8" standalone="no"?> <students> <student> <name sn="03" sn2="0322"/> </student> </students> 我想要得到修改后的结果为： <?xml version="1.0" encoding="UTF-8" standalone="no"?> <students> <student> <name sn="03" sn2="0322"/> <name sn="04" sn2="0422"/> </student> </students> 我的代码为： public static void main(String[] args) { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); try { DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse("D:/students.xml"); Element eltName = doc.createElement("name"); Attr attr = doc.createAttribute("sn"); attr.setValue("04"); Attr attr2 = doc.createAttribute("sn2"); attr2.setValue("0422"); eltName.setAttributeNode(attr); eltName.setAttributeNode(attr2); Element eltRoot=doc.getDocumentElement(); eltRoot.appendChild(eltName); doc2XmlFile(doc, "D:/students.xml"); } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 将Document对象修改后写入到xml里面 * @param document Document对象 * @param filename xml文件路径 * @return */ public boolean doc2XmlFile(Document document, String filename) { boolean flag = true; try { /** 将document中的内容写入文件中 */ TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer transformer = tFactory.newTransformer(); /** 编码 */ transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); DOMSource source = new DOMSource(document); StreamResult result = new StreamResult(new File(filename)); transformer.transform(source, result); } catch (Exception ex) { flag = false; System.out.println("更新" + filename + "出错：" + ex); log.error("更新" + filename + "出错：" + ex); ex.printStackTrace(); } return flag; } 这样得到的结果为： <?xml version="1.0" encoding="UTF-8" standalone="no"?> <students> <student> <name sn="03" sn2="0322"/> </student> <name sn="04" sn2="0422"/> </students> 弄了一天了也没能把添加的name节点放到student节点下面，请教各位大侠了！