Java如何使用DOM4j解析XML呢？

DOM4j简介

dom4j是一个开源库
它用于处理XML、 XPath和XSLT
dom4j基于Java平台，使用Java的集合框架
 全面集成了DOM，SAX和JAXP

//测试xml文件
<?xml version="1.0" encoding="UTF-8"?>
<students name="zhangsan">
    <hello name="lisi">hello Text1</hello>
    <hello name="lisi2">hello Text2</hello>
    <hello name="lisi3">hello Text3</hello>
    <world name="wangwu">world text1</world>
    <world name="wangwu2">world text2</world>
    <world >world text3</world>
</students>
/**
 * dom4j读取并解析xml
 */
public class Dom4JTest2
{
    public static void main(String[] args) throws Exception
    {
        SAXReader saxReader = new SAXReader();
        Document document = saxReader.read(new File("test.xml"));
        // 获取根元素
        Element root = document.getRootElement();
        System.out.println("Root: " + root.getName());

        // 获取所有子元素
        list<Element> childList = root.elements();
        System.out.println("total child count: " + childList.size());

        // 获取特定名称的子元素
        List<Element> childList2 = root.elements("hello");
        System.out.println("hello child: " + childList2.size());

        // 获取名字为指定名称的第一个子元素
        Element firstWorldElement = root.element("world");
        // 输出其属性
        System.out.println("first World Attr: "
                + firstWorldElement.attribute(0).getName() + "="
                + firstWorldElement.attributeValue("name"));
        System.out.println("迭代输出-----------------------");
        // 迭代输出
        for (Iterator iter = root.elementIterator(); iter.hasNext();)
        {
            Element e = (Element) iter.next();
            System.out.println(e.attributeValue("name"));
        }
        System.out.println("用DOMReader-----------------------");
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        // 注意要用完整类名
        org.w3c.dom.Document document2 = db.parse(new File("test.xml "));
        DOMReader domReader = new DOMReader();

        // 将JAXP的Document转换为dom4j的Document
        Document document3 = domReader.read(document2);
        Element rootElement = document3.getRootElement();
        System.out.println("Root: " + rootElement.getName());
    }
}