<?xml version="1.0" encoding="UTF-8"?> 
<books> 
   <book id="001"> 
      <title>Harry Potter</title> 
      <author>J K. Rowling</author> 
   </book> 
   <book id="002"> 
      <title>Learning XML</title> 
      <author>Erik T. Ray</author> 
   </book> 
</books> 

import java.io.File; import java.util.List,

  。

import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader,

public class Demo { 。

 public static void main(String[] args) throws Exception {   SAXReader reader = new SAXReader();   File file = new File("books.xml");   Document document = reader.read(file);   Element root = document.getRootElement();   List<Element> childElements = root.elements();   for (Element child : childElements) {    //未知属性名情况下    /*List<Attribute> attributeList = child.attributes();    for (Attribute attr : attributeList) {     System.out.println(attr.getName() + ": " + attr.getValue());    }*/    //已知属性名情况下    System.out.println("id: " + child.attributeValue("id"));    //未知子元素名情况下    /*List<Element> elementList = child.elements();    for (Element ele : elementList) {     System.out.println(ele.getName() + ": " + ele.getText());    }    System.out.println();*/    //已知子元素名的情况下    System.out.println("title" + child.elementText("title"));    System.out.println("author" + child.elementText("author"));    //这行是为了格式化美观而存在    System.out.println();   }  } 。

} 。

import java.io.File; import java.util.Iterator,

  。

import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader,

public class Demo {  public static void main(String[] args) throws Exception {   SAXReader reader = new SAXReader();   Document document = reader.read(new File("books.xml"));   Element root = document.getRootElement();   Iterator it = root.elementIterator();   while (it.hasNext()) {    Element element = (Element) it.next();    //未知属性名称情况下    /*Iterator attrIt = element.attributeIterator();    while (attrIt.hasNext()) {     Attribute a  = (Attribute) attrIt.next();     System.out.println(a.getValue());    }*/    //已知属性名称情况下    System.out.println("id: " + element.attributeValue("id"));    //未知元素名情况下    /*Iterator eleIt = element.elementIterator();    while (eleIt.hasNext()) {     Element e = (Element) eleIt.next();     System.out.println(e.getName() + ": " + e.getText());    }    System.out.println();*/    //已知元素名情况下    System.out.println("title: " + element.elementText("title"));    System.out.println("author: " + element.elementText("author"));    System.out.println();   }  } } 。

import java.io.File; import java.io.FileOutputStream,

  。

import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter,

public class Demo {  public static void main(String[] args) throws Exception {   Document doc = DocumentHelper.createDocument();   //增加根节点   Element books = doc.addElement("books");   //增加子元素   Element book1 = books.addElement("book");   Element title1 = book1.addElement("title");   Element author1 = book1.addElement("author");   Element book2 = books.addElement("book");   Element title2 = book2.addElement("title");   Element author2 = book2.addElement("author");   //为子节点添加属性   book1.addAttribute("id", "001");   //为元素添加内容   title1.setText("Harry Potter");   author1.setText("J K. Rowling");   book2.addAttribute("id", "002");   title2.setText("Learning XML");   author2.setText("Erik T. Ray");   //实例化输出格式对象   OutputFormat format = OutputFormat.createPrettyPrint();   //设置输出编码   format.setEncoding("UTF-8");   //创建需要写入的File对象   File file = new File("D:" + File.separator + "books.xml");   //生成XMLWriter对象，构造函数中的参数为需要输出的文件流和格式   XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);   //开始写入，write方法中包含上面创建的Document对象   writer.write(doc);  } } 。