jaxp添加结点
eg：
//在第一个下面添加nv
/
1.创建解析器工厂
* 2.根据解析器工厂创建解析器
* 3.解析xml返回document
*
* 4.得到第一个p1
* -得到所有p1使用item方法得到第一个p1
*
* 5.创建sex标签 createElement
* 6.创建文本 createTextNode
* 7.把文本添加到sex下面appendChild方法
* 8.把sex添加到第一个p1的下面
*
* 9.回写xml
* */
private static void addNode() throws ParserConfigurationException, SAXException, IOException,TransformerFactoryConfigurationError, TransformerConfigurationException, TransformerException {//创建解析器工厂DocumentBuilderFactory builderFactoty = DocumentBuilderFactory.newInstance();//创建解析器DocumentBuilder builder = builderFactoty.newDocumentBuilder();//解析xml返回documentDocument document = builder.parse("src/person.xml");//得到第一个p1元素NodeList nodeLists = document.getElementsByTagName("p1");Node p1 = nodeLists.item(0);//System.out.println(nodeLists.item(0).getTextContent());//创建sex标签Element sex1 = document.createElement("sex");//创建nv文本Text nv = document.createTextNode("nv");sex1.appendChild(nv);//Node nv = sex.createTextNode("nv");//添加到p1下p1.appendChild(sex1);System.out.println(p1.getTextContent());//回写xmlTransformerFactory transformFactory = TransformerFactory.newInstance();Transformer transformer = transformFactory.newTransformer();transformer.transform(new DOMSource(document), new StreamResult("src/person.xml"));}
)
