jaxp dom-appendChild 某一个标签下创建 有内容无属性的标签

<?xml version="1.0" encoding="UTF-8"?>

<shopping>

	<book>
		<name id="0001">灵枢</name>
		<price discount="90" originalPrice="100">90</price>
		<count>3</count>
		<comment>默认好评</comment>
	</book>

	<book>
		<name id="0002">素问</name>
		<price discount="90" originalPrice="200">180</price>
		<count>5</count>
		<comment>默认好评</comment>
	</book>

	<book>
		<name id="0003">伤寒杂病论</name>
		<price discount="90" originalPrice="300">270</price>
		<count>7</count>
		<comment>默认好评</comment>
	</book>

</shopping>

package jizuiku.xml_E;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

/**
 * jaxp 在某一个标签下创建 有内容无属性的标签
 * 
 * @author 给最苦
 * @version V17.10.10
 */
public class JaxpDemo {
	public static void main(String[] args) throws Exception{
		// 创建解析器工厂
		DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

		// 创建解析器
		DocumentBuilder builder = builderFactory.newDocumentBuilder();

		// 解析xml返回document
		// uri为相对路径
		String uri = "src\\jizuiku\\xml_E\\shopping.xml";
		// Document -> import org.w3c.dom.Document;
		Document document = builder.parse(uri);

		// 得到所有的book元素
		NodeList bookNodeList = document.getElementsByTagName("book");

		// 在第一个book标签下，创建<sales>1000</sales>
		Node firstBookNode = bookNodeList.item(0);

		// 创建标签
		Element salesNode = document.createElement("sales");
		Text salesNodeText = document.createTextNode("1000");
		
		// 把文本加到标签下
		salesNode.appendChild(salesNodeText);
		
		// 把标签加到标签下
		firstBookNode.appendChild(salesNode);
		
		// 回写操作，感觉好复杂呀
		TransformerFactory transformerFactory = TransformerFactory.newInstance();
		Transformer transformer = transformerFactory.newTransformer();
		
		transformer.transform(new DOMSource(document), new StreamResult(uri));
	}
}

<?xml version="1.0" encoding="UTF-8" standalone="no"?><shopping>

	<book>
		<name id="0001">灵枢</name>
		<price discount="90" originalPrice="100">90</price>
		<count>3</count>
		<comment>默认好评</comment>
	<sales>1000</sales></book>

	<book>
		<name id="0002">素问</name>
		<price discount="90" originalPrice="200">180</price>
		<count>5</count>
		<comment>默认好评</comment>
	</book>

	<book>
		<name id="0003">伤寒杂病论</name>
		<price discount="90" originalPrice="300">270</price>
		<count>7</count>
		<comment>默认好评</comment>
	</book>

</shopping>