一、DOM读取
import ***;
public class ReadXML {
public static void main(String[] args) {
try { //DOM DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse(new File("languages.xml")); Element root = document.getDocumentElement(); System.out.println("cat="+root.getAttribute("cat")); NodeList list = root.getElementsByTagName("lan"); for (int i = 0; i < list.getLength(); i++) { Element lan = (Element) list.item(i); System.out.println("---------------"); System.out.println("id="+lan.getAttribute("id")); NodeList clist = lan.getChildNodes(); for (int j = 0; j < clist.getLength(); j++) { Node c = clist.item(j); if (c instanceof Element) {//这一行的作用是将元素键的回车换行等不可见的元素如#text去掉 System.out.println(c.getNodeName()+"="+c.getTextContent()); } } } } catch (**){...}}
xml文件如下
<?xml version="1.0" encoding="UTF-8"?>
<Languages cat="it"> <lan id="1"> <name>Java</name> <ide>Eclipse</ide> </lan> <lan id="2"> <name>Swift</name> <ide>Xcode</ide> </lan> <lan id="3"> <name>C#</name> <ide>Visual Studio</ide> </lan></Languages>
二、DOM创建XML
//DOM
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.newDocument(); Element root = document.createElement("Languages"); root.setAttribute("cat", "it"); Element lan1 = document.createElement("lan"); lan1.setAttribute("id", "1"); Element name1 = document.createElement("name"); name1.setTextContent("Java"); Element ide1 = document.createElement("ide"); ide1.setTextContent("Eclipse"); lan1.appendChild(name1); lan1.appendChild(ide1); Element lan2 = document.createElement("lan"); lan2.setAttribute("id", "2"); Element name2 = document.createElement("name"); name2.setTextContent("Swift"); Element ide2 = document.createElement("ide"); ide2.setTextContent("XCode"); lan2.appendChild(name2); lan2.appendChild(ide2); Element lan3 = document.createElement("lan"); lan3.setAttribute("id", "3"); Element name3 = document.createElement("name"); name3.setTextContent("C#"); Element ide3 = document.createElement("ide"); ide3.setTextContent("Visual Studio"); lan3.appendChild(name3); lan3.appendChild(ide3); root.appendChild(lan1); root.appendChild(lan2); root.appendChild(lan3); document.appendChild(root); //------------- TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); transformer.setOutputProperty("encoding", "UTF-8"); StringWriter writer = new StringWriter(); transformer.transform(new DOMSource(document), new StreamResult(writer)); System.out.println(writer.toString()); transformer.transform(new DOMSource(document), new StreamResult(new File("newxml.xml")));