<?xml version="1.0" encoding="UTF-8"?><books>	<book id="book1">		<title>JAVA编程思想</title>		<price>80.00</price>	</book>	<book id="book2">		<title>JAVA核心技术</title>		<price>100.00</price>	</book></books>

package com.chen.dom;import java.io.File;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.OutputStreamWriter;import java.util.Iterator;import java.util.List;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;import org.junit.Test;public class Dom4jTest {    @Test    public void read() throws Exception {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("resource/book.xml"));        Element root = document.getRootElement();        Element book1 = (Element) root.elements("book").get(0);        String id1 = book1.attributeValue("id");        String titleText = book1.element("title").getTextTrim();        System.out.println(id1 + "---" + titleText);    }    /*     * 将整个xml使用递归完整输出     */    @Test    public void readIterator() throws Exception {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("resource/book.xml"));        Element root = document.getRootElement();        // 递归解析xml        parse(root);    }    // 递归解析xml    public void parse(Element element) {        System.out.print("<" + element.getName());        // 遍历节点的属性        List<Attribute> attributes = element.attributes();        for (int i = 0; i < attributes.size(); i++) {            Attribute attr = attributes.get(i);            String name = attr.getName();            String value = attr.getValue();            System.out.print(" " + name + "=\"" + value + "\"");        }        System.out.println(">");        // 获取节点的文本信息        if (element.getTextTrim() != null && !"".equals(element.getTextTrim())) {            System.out.println(element.getTextTrim());        }        // 对该节点进行递归        for (Iterator i = element.elementIterator(); i.hasNext();) {            parse((Element) i.next());        }        System.out.println("</" + element.getName() + ">");    }    @Test    public void add() throws Exception {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("resource/book.xml"));        Element root = document.getRootElement();        Element book1 = (Element) root.elements("book").get(1);        Element authorElement = book1.addElement("author")                .addAttribute("id", "author2").addText("张三");                        OutputFormat format = OutputFormat.createPrettyPrint();        //从这里可以看出dom4j默认的编码方式为utf-8        System.out.println(format.getEncoding());        //设置编码格式防止乱码   <?xml version="1.0" encoding="gb2312"?>         format.setEncoding("utf-8");                //使用FileWriter会乱码，因为使用了默认的gb2312编码输出，而dom4j使用的是默认的UTF-8编码        //如果format.setEncoding("gb2312"); 使用FileWriter就不会乱码        //XMLWriter writer = new XMLWriter(new FileWriter("resource/book.xml"),format);                //使用FileOutputStream输出时指定编码  这个编码要和format.setEncoding("utf-8"); 一样        //XMLWriter writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream("resource/book.xml"), "utf-8"),format);        //最简单的方法是设置format.setEncoding("utf-8");然后使用字节流输出        XMLWriter writer = new XMLWriter(new FileOutputStream("resource/book.xml"),format);                writer.write(document);        writer.close();    }        //在指定位置上添加个新节点(改变list集合的顺序)    @Test    public void add2() throws Exception {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("resource/book.xml"));        Element element = document.getRootElement().element("book");        List list = element.elements();        Element publishElement = DocumentHelper.createElement("publish");        publishElement.addText("机械工业出版社");        //改变list集合的顺序，就可以达到在指定位置添加新节点        list.add(1, publishElement);                OutputFormat format = OutputFormat.createPrettyPrint();        format.setEncoding("utf-8");                XMLWriter writer = new XMLWriter(new FileOutputStream("resource/book.xml"),format);        writer.write(document);        writer.close();    }}