<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE 书架 SYSTEM "book.dtd">

<书架>

    <书>

        <书名>Java就业培训教程</书名>

        <作者>张孝祥</作者>

        <售价>39.00</售价>

    </书>

    <书>

        <书名>JavaScript网页开发</书名>

        <作者>张孝祥</作者>

        <售价>28.00</售价>

    </书>

        <狗></狗>

</书架>

package com.swift.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 DemoXML {

    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

        DocumentBuilder builder = factory.newDocumentBuilder();

        Document document = builder.parse("src/index.xml");

        NodeList list = document.getElementsByTagName("书");

        Node node = list.item(1);

        // 拿到书的所有文本

        String text = node.getTextContent();

        System.out.println(text);

        // 得到根节点

        Node root = document.getElementsByTagName("书架").item(0);

        // 递归遍历不包括文本

        traverse(root);

    }

    private static void traverse(Node root) {

        if (root instanceof Element) {

            System.out.println(root.getNodeName());

        }

        NodeList list = root.getChildNodes();

        for (int i = 0; i < list.getLength(); i++) {

            Node node = list.item(i);

            traverse(node);

        }

    }

}