利用XML的dom进行数据的增删改查

时间：2017-12-14 11:08:19 阅读：172 评论：0 收藏：0 [点我收藏+]

import java.io.FileOutputStream; import javax.swing.event.DocumentListener; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.junit.Test; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; //使用DOM方式对XML文档进行CRUD public class Demo2 { //查询数据 @Test public void read() throws Exception{ //1：创建工厂 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); //2：得到DOM解析器 DocumentBuilder builder = factory.newDocumentBuilder(); //3：解析XML文档，得到代表文档的document Document document = builder.parse("src/book.xml"); NodeList list = document.getElementsByTagName("书名"); Node node = list.item(1); String content = node.getTextContent(); System.out.println(content); } //添加数据 @Test public void add() throws Exception{ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse("src/book.xml"); //创建节点 Element price = document.createElement("售价"); price.setTextContent("3.15元"); //把创建的节点挂在第一本书上 Element book =(Element) document.getElementsByTagName("书").item(0); book.appendChild(price); //把更新后内存写会到XML文档 TransformerFactory tffactory = TransformerFactory.newInstance(); Transformer tf = tffactory.newTransformer(); tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml"))); } //向指定位置添加节点 @Test public void add1() throws Exception{ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse("src/book.xml"); //创建节点 Element price = document.createElement("售价"); price.setTextContent("5.25元"); //得到参考节点 Element refNode=(Element)document.getElementsByTagName("售价").item(0); //得到要挂载的节点 Element book = (Element) document.getElementsByTagName("书").item(0); //往book节点的指定位置插入 book.insertBefore(price, refNode); //把更新后内存写会到XML文档 TransformerFactory tffactory = TransformerFactory.newInstance(); Transformer tf = tffactory.newTransformer(); tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml"))); } //向XML文档节点上添加属性 @Test public void addattr() throws Exception{ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse("src/book.xml"); //得到参考节点 Element bookName=(Element)document.getElementsByTagName("书名"); bookName.setAttribute("name", "XXXXX"); //把更新后内存写会到XML文档 TransformerFactory tffactory = TransformerFactory.newInstance(); Transformer tf = tffactory.newTransformer(); tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml"))); } //删除单个节点 @Test public void delete() throws Exception{ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse("src/book.xml"); //先得到要删除的节点 Element delE = (Element) document.getElementsByTagName("售价").item(0); //得到要删除节点的爸爸 Element book = (Element) document.getElementsByTagName("书").item(0); //爸爸删除 book.removeChild(delE); } //删除全部节点 @Test public void deleteAll() throws Exception{ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse("src/book.xml"); //先得到要删除的节点 Element book = (Element) document.getElementsByTagName("售价").item(0); book.getParentNode().getParentNode().getParentNode().removeChild(book.getParentNode().getParentNode()); //把更新后内存写会到XML文档 TransformerFactory tffactory = TransformerFactory.newInstance(); Transformer tf = tffactory.newTransformer(); tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml"))); } //更新售价 @Test public void update() throws Exception{ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse("src/book.xml"); Element book = (Element) document.getElementsByTagName("售价").item(0); book.setTextContent("105"); //把更新后内存写会到XML文档 TransformerFactory tffactory = TransformerFactory.newInstance(); Transformer tf = tffactory.newTransformer(); tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml"))); } }

书的XML

<?xml version="1.0" encoding="UTF-8" standalone="no"?><书架>
	<书>
		<书名>Java培训</书名>
		<作者>张扬</作者>
		<售价>5.25元</售价>
	</书>

	<书>
		<书名>Java培训2</书名>
		<作者>张扬</作者>
		<售价>21.5</售价>
	</书>
</书架>

利用XML的dom进行数据的增删改查

标签：xml ； dom ；java基础

原文地址：http://blog.51cto.com/meyangyang/2050524

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