首先得到:得到 DOM 解析器的工厂实例
DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();
然后从 DOM 工厂获得 DOM 解析器
DocumentBuilder dombuilder=domfac.newDocumentBuilder();
3 )把要解析的 XML 文档转化为输入流,以便 DOM 解析器解析它
File xmlFile = new File("d:\\test1.xml");
( 4 )解析 XML 文档的输入流,得到一个 Document
Document doc=dombuilder.parse(xmlFile );
( 5 )得到 XML 文档的根节点
Element root=doc.getDocumentElement();
( 6 )得到节点的子节点
NodeList books=root.getChildNodes();
Java代码 package com.st.demo; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; public class XmlReader { public static void main(String[] args) { XmlReader reader = new XmlReader(); } public XmlReader(){ DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance(); try { DocumentBuilder domBuilder = domfac.newDocumentBuilder(); File xmlFile = new File("d:\\test1.xml"); Document doc = domBuilder.parse(xmlFile); Element root = doc.getDocumentElement(); NodeList books = root.getChildNodes(); if(books!=null){ for (int i = 0; i < books.getLength(); i++) { Node book = books.item(i); if(book.getNodeType()==Node.ELEMENT_NODE) { //(7)取得节点的属性值 String email=book.getAttributes().getNamedItem("email").getNodeValue(); System.out.println(email); //注意,节点的属性也是它的子节点。它的节点类型也是Node.ELEMENT_NODE //(8)轮循子节点 for(Node node=book.getFirstChild();node!=null;node=node.getNextSibling()) { if(node.getNodeType()==Node.ELEMENT_NODE) { if(node.getNodeName().equals("name")) { String name=node.getFirstChild().getNodeValue(); System.out.println(name); } if(node.getNodeName().equals("price")) { String price=node.getFirstChild().getNodeValue(); System.out.println(price); } } } } } } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } Xml代码 <?xml version="1.0" encoding="GB2312" standalone="no"?> <books> <book email="zhoujunhui"> <name>gsf</name> <price>445</price> </book> </books> 另一种实现方式: public Map<String, Double> getFormulaList(String pathA) { // TODO Auto-generated method stub List<List> formulaList = new ArrayList<List>(); // 创建解析的xml文档对象, File xmlFile = new File(pathA); // 声明一个 DocumentBuilder对象. 抽象类,不能直接构建,可以通过 DocumentFactory 来构建。 DocumentBuilder builder = null; // 声明一个 DocumentBuilderFactory对象. 通过单例模式创建 DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance(); Map<String, Double>results=new HashMap<String, Double>(); // 取得默认的 DocumentBuilder. try { builder = builderFactory.newDocumentBuilder(); // 解析文件 Document document = builder.parse(xmlFile); // 获得根元素 Element root = document.getDocumentElement(); System.out.println("根元素:" + root.getNodeName()); // 获得根元素下的子节点 // NodeList childNodes = root.getChildNodes(); NodeList childNodes=root.getElementsByTagName("Formula"); // 遍历这些子节点 for (int i = 0; i < childNodes.getLength(); i++) { String key=root.getElementsByTagName("name").item(i).getFirstChild().getNodeValue(); Double value=Double.parseDouble(root.getElementsByTagName("percent").item(i).getFirstChild().getNodeValue()); results.put(key, value); } }catch (Exception e) { e.printStackTrace(); } return results; } xml代码: <?xml version="1.0" encoding="UTF-8"?> <FormulaList> <Formula> <name>完成度</name> <percent>0.4</percent> </Formula> <Formula> <name>知晓度</name> <percent>0.2</percent> </Formula> <Formula> <name>参与度</name> <percent>0.2</percent> </Formula> <Formula> <name>满意度</name> <percent>0.2</percent> </Formula> </FormulaList>