JAXP DOM 操作xml

package com.lan.xml;import java.io.IOException;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.junit.Test;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.xml.sax.SAXException;//使用dom方式对xml文档crudpublic class Demo3 {@Testpublic void create() throws SAXException, IOException, ParserConfigurationException{//1.创建工厂DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");//创建节点Element pricElement = document.createElement("二手价");pricElement.setTextContent("88888888元");//把创建的节点挂到第一本书上(只是改内存)Element book = (Element) document.getElementsByTagName("书").item(0);book.appendChild(pricElement);//把更新后的内存写回到xml               TransformerFactory tFactory = TransformerFactory.newInstance();Transformer tf = tFactory.newTransformer();tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));}}

<?xml version="1.0" encoding="UTF-8" ?><书架><书><书名 name="xxxxx">lan</书名><作者>lan</作者><售价>100000000000000000元</售价></书><书><书名 name="yyyyy">lll</书名><作者>lll</作者><售价>200000000000000000元</售价></书></书架>