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

<books id="aaa">

   <book id="1">

       <name>书名1</name>

       <price>100</price>

   </book>

   <book id="2">

       <name>书名2</name>

       <price>300</price>

   </book>

</books>

import java.io.File;

import java.io.IOException;

import javax.lang.model.element.Element;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.soap.Node;

import org.w3c.dom.Document;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

public class ReadXml {

    public static void main(String[] args) {

        try {

            //java读取xml的方法。DOM方式

            DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();

            DocumentBuilder builder=factory.newDocumentBuilder();

            Document document=builder.parse(new File("NewFile.xml"));

            //获取文档根元素

            org.w3c.dom.Element root=document.getDocumentElement();

            //输出根元素id的值

            System.out.println(root.getAttribute("id"));

            //获取子级元素

            NodeList list= root.getElementsByTagName("book");

            //循环输出xml标签元素的值

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

                org.w3c.dom.Element book=(org.w3c.dom.Element)list.item(i);

                System.out.println("--------");

                System.out.println("id="+book.getAttribute("id"));

                //获取所有子节点

                NodeList list1=book.getChildNodes();

                //循环输出子节点中的元素内容

                for (int j = 0; j < list1.getLength(); j++) {

                    org.w3c.dom.Node child=(org.w3c.dom.Node)list1.item(j);

                    //去掉空白节点

                    if(child instanceof org.w3c.dom.Element){

                    System.out.println(child.getNodeName()+"标签内容是"+child.getTextContent());

                    }

                }

                //读取子节点中元素的值，都要重新创建一个element对象

                /*org.w3c.dom.Element name=(org.w3c.dom.Element) book.getElementsByTagName("name").item(0);

                System.out.println("name="+name.getTextContent());*/

            }

        }

        catch (ParserConfigurationException e)

        {

            e.printStackTrace();

        } catch (SAXException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

aaa

--------

id=1

name标签内容是书名1

price标签内容是100

--------

id=2

name标签内容是书名2

price标签内容是300