xml解析方式和优缺点_xml需要什么软件打开

2024年 8月 3日上午11:14 • 激活谷笔记

XML 的4种解析方式　　package com.ys.xml; import java.io.FileOutputStream; 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; public class DomParser{ / * 解析器读入整个文档，然后构建一个驻留内存的树结构， * 该方法返回 Document 对象，然后我们可以通过这个对象来操作文档 */ public Document getDocument(String fileName) throws Exception{ //1.创建解析工厂 DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); //2.得到解析器 DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); //3.得到文档对象 Document document = dBuilder.parse(fileName); return document; } //读取xml文档中的数据 public void read(String fileName) throws Exception{ // Document 对象 Document document = new DomParser().getDocument(fileName); //<name></name>的节点 NodeList nameNode = document.getElementsByTagName(“name”); //<name sex=”xxx”></name>节点的sex属性 Element element = (Element) document.getElementsByTagName(“name”).item(0); System.out.println(element.getAttribute(“sex”));//xxx for(int i = 0 ; i < nameNode.getLength() ;i++){ System.out.println(nameNode.item(i).getTextContent()); } /结果为 * Tom * Bob * Marry */ //文档的根素对象 Element rootElementName = document.getDocumentElement(); System.out.println(rootElementName.getNodeName()); //students //得到根节点 Node root = document.getElementsByTagName(rootElementName.getNodeName()).item(0); list(root); } //打印所有标签 private void list(Node root) { if(root instanceof Element){ System.out.println(root.getNodeName()); } NodeList list = root.getChildNodes(); for(int i = 0 ; i < list.getLength() ; i++){ Node child = list.item(i); list(child); } } //向 xml 文件中增加节点和属性 public void add(String fileName) throws Exception{ // Document 对象 Document document = new DomParser().getDocument(fileName); //创建节点 Element sex = document.createElement(“sex”); sex.setTextContent(“男”); //把创建的节点添加到第一个<student></student>标签上 Element student = (Element) document.getElementsByTagName(“student”).item(0); student.appendChild(sex); //在<name></name>中增加属性 <name address=”xxx”></name> Element name = (Element) document.getElementsByTagName(“name”).item(0); name.setAttribute(“address”, “xxx”); //把更新后的内存写入xml文档中 TransformerFactory tfFactory = TransformerFactory.newInstance(); Transformer tFormer = tfFactory.newTransformer(); tFormer.transform(new DOMSource(document), new StreamResult(new FileOutputStream(“src/student.xml”))); } //向 xml 文件中删除节点和属性 public void delete(String fileName) throws Exception{ // Document 对象 Document document = new DomParser().getDocument(fileName); //得到要删除的第一个<name></name>节点 Element name = (Element) document.getElementsByTagName(“name”).item(0); //得到要删除的第一个<name></name>节点的父节点 //Element student = (Element) document.getElementsByTagName(“student”).item(0); //student.removeChild(name); //上面两步可以简写为 name.getParentNode().removeChild(name); //在<name></name>中删除属性 <name address=”xxx”></name> name.removeAttribute(“address”); //把更新后的内存写入xml文档中 TransformerFactory tfFactory = TransformerFactory.newInstance(); Transformer tFormer = tfFactory.newTransformer(); tFormer.transform(new DOMSource(document), new StreamResult(new FileOutputStream(“src/student.xml”))); } //向 xml 文件中更新节点和属性 public void update(String fileName) throws Exception{ // Document 对象 Document document = new DomParser().getDocument(fileName); //得到要删除的第一个<name></name>节点 Element name = (Element) document.getElementsByTagName(“name”).item(0); //在<name></name>中更新属性 <name address=”xxx”></name>为<name address=”yyy”></name> name.setAttribute(“address”, “yyy”); //更新name节点的文字为VAE,即<name>vae</name> name.setTextContent(“vae”); //把更新后的内存写入xml文档中 TransformerFactory tfFactory = TransformerFactory.newInstance(); Transformer tFormer = tfFactory.newTransformer(); tFormer.transform(new DOMSource(document), new StreamResult(new FileOutputStream(“src/student.xml”))); } }

xml解析方式和优缺点_xml需要什么软件打开

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