Demo2.java
import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document;public class Demo2 {public static void main(String args[])throws Exception {//1.创建工程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documentDocument document = builder.parse("src/book.xml");}}
xml解析技术概述和使用Jaxp对xml文档进行dom解析
package cn.lysine;import org.junit.Test;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;//使用dom方式对xml文档进行 增删查改 CRUDpublic class Demo3 {// 读取xml文档中；<书名>java就业培训中心</书名> 节点的值@Testpublic void read1() throws Exception {DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();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); //输出 java就业培训中心 }//得到xml中标签属性的值@Testpublic void read2() throws Exception {DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");// 得到根结点Node root = document.getElementsByTagName("书架").item(0);list(root);}private void list(Node node) {System.out.println(node.getNodeName());NodeList list = node.getChildNodes();for(int i = 0; i <list.getLength(); i++ ){Node childe = list.item(i);list(childe);}}//得到xml文档中标签属性的值：<书名 name="xxxx">java就业培训教材</书名>@Testpublic void read3() throws Exception{DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");Element bookname = (Element)document.getElementsByTagName("书名").item(0);String value = bookname.getAttribute("name");System.out.println(value);} //输出 xxxx}
import java.io.FileOutputStream;import java.io.IOException;import org.junit.Test;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;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;//使用dom方式对xml文档进行 增删查改 CRUDpublic class Demo3 {// 读取xml文档中；<书名>java就业培训中心</书名> 节点的值@Testpublic void read1() throws Exception {DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");NodeList list = document.getElementsByTagName("书名");Node node = list.item(0);String content = node.getTextContent();System.out.println(content);}//得到xml中标签属性的值@Testpublic void read2() throws Exception {DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");// 得到根结点Node root = document.getElementsByTagName("书架").item(0);list(root);}private void list(Node node) {System.out.println(node.getNodeName());NodeList list = node.getChildNodes();for(int i = 0; i <list.getLength(); i++ ){Node childe = list.item(i);list(childe);}}//得到xml文档中标签属性的值：<书名 name="xxxx">java就业培训教材</书名>@Testpublic void read3() throws Exception{DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");Element bookname = (Element)document.getElementsByTagName("书名").item(0);String value = bookname.getAttribute("name");System.out.println(value);}//向xml文档中添加节点：<售价>59.00元</售价>@Testpublic 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("59.00元");//得到参考节点Element refNode = (Element) document.getElementsByTagName("售价").item(0);//得到要挂崽的节点 把创建的节点挂到第一本书上Element book = (Element)document.getElementsByTagName("书").item(0);//往book节点的指定位置插崽book.insertBefore(price,refNode);//把更新后内存写回到xml文档TransformerFactory tffactory = TransformerFactory.newInstance();Transformer tf = tffactory.newTransformer();tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));}//add 向xml文档中添加节点：<书名>java就业培训教程</书名> 上添加name=“xxxx”属性@Testpublic void addAttr() throws Exception{DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");Element bookname = (Element) document.getElementsByTagName("书名").item(0);bookname.setAttribute("name", "xxxxx");//把更新后内存写回到xml文档TransformerFactory tffactory = TransformerFactory.newInstance();Transformer tf = tffactory.newTransformer();tf.transform(new DOMSource(document),new StreamResult(new FileOutputStream("src/book.xml")));}//删除整个xml@Testpublic void delete1() throws Exception{DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");//得到要删除的结点Element e = (Element) document.getElementsByTagName("售价").item(0);//得到要删除的结点的爸爸Element book = (Element) document.getElementsByTagName("书").item(0);//爸爸再删崽book.removeChild(e);//把更新后内存写回到xml文档TransformerFactory tffactory = TransformerFactory.newInstance();Transformer tf = tffactory.newTransformer();tf.transform(new DOMSource(document),new StreamResult(new FileOutputStream("src/book.xml")));}public void delete2() throws Exception{DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");//得到要删除的结点Element e = (Element) document.getElementsByTagName("售价").item(0);e.getParentNode().getParentNode().getParentNode().removeChild(e.getParentNode().getParentNode());//把更新后内存写回到xml文档TransformerFactory tffactory = TransformerFactory.newInstance();Transformer tf = tffactory.newTransformer();tf.transform(new DOMSource(document),new StreamResult(new FileOutputStream("src/book.xml")));}//update 更新public void update()throws ParserConfigurationException, SAXException, IOException,Exception{DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("src/book.xml");//得到要更新的结点Element e = (Element) document.getElementsByTagName("售价").item(0);e.setTextContent("109元");//把更新后内存写回到xml文档TransformerFactory tffactory = TransformerFactory.newInstance();Transformer tf = tffactory.newTransformer();tf.transform(new DOMSource(document),new StreamResult(new FileOutputStream("src/book.xml")));}}
