xml dom解析器 遍历打印标签

package com.lan.xml;import java.io.IOException;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;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;public class Demo2 {public static void main(String[] args) {//1.创建工厂DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();//2.得到dom解析器DocumentBuilder builder = null;try { builder = factory.newDocumentBuilder();} catch (ParserConfigurationException e) {e.printStackTrace();}//3.解析xml文档，得到代表文档的documenttry {Document document = builder.parse("src/book.xml");NodeList nlist = document.getElementsByTagName("书名");Node bookname = nlist.item(0);String content = bookname.getTextContent();System.out.println(content);System.out.println();//强行转换Element(前提是知道获取的Node为ElementElement bookNameChange = (Element) nlist.item(0);String value = bookNameChange.getAttribute("name");System.out.println(value);System.out.println();//递归遍历打印标签//得到根结点Node root = document.getElementsByTagName("书架").item(0);list(root);} catch (SAXException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//递归遍历打印标签private static void list(Node root) {if (root instanceof Element) {System.out.println(root.getNodeName());}//System.out.println(root.getNodeName());NodeList list = root.getChildNodes();for(int i=0;i<list.getLength();i++){Node Child = list.item(i);list(Child);}}}

<?xml version="1.0" encoding="UTF-8" ?><书架><书><书名 name="xxxxx">lan</书名><作者>lan</作者><售价>100000000000000000元</售价></书></书架>