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
InputStream is= new FileInputStream("test1.xml");
( 4 )解析 XML 文档的输入流,得到一个 Document
Document doc=dombuilder.parse(is);
( 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();
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(); InputStream is = new FileInputStream(new File("D:/test1.xml")); Document doc = domBuilder.parse(is); 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.getNodeValue(); String name1=node.getFirstChild().getNodeValue(); System.out.println(name); System.out.println(name1); } 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: