jaxp dom-setTextContent 修改标签的文本内容

<?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>

package jizuiku.xml_F;

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.Node;
import org.w3c.dom.NodeList;

/**
 * jaxp 修改xml中一个标签的文本内容
 * 
 * @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_F\\shopping.xml";
		// Document -> import org.w3c.dom.Document;
		Document document = builder.parse(uri);

		// 得到所有的sales元素
		NodeList salesNodeList = document.getElementsByTagName("sales");

		// 修改第一个sales标签的内容
		Node firstSalesNode = salesNodeList.item(0);
		firstSalesNode.setTextContent("2000");

		// 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));

		/*
		 * 别看上面的程序很简单都是套路，但是 给最苦 在写的时候 也是经历了一些困难的
		 * 
		 */
	}
}

<?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>2000</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>