dom4j创建xml文件

<!-- dom4j的jar包 -->
        <dependency>
            <groupId>org.dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>2.1.1</version>
        </dependency>
        <!-- dom4j使用XPath需要的jar包 -->
        <dependency>
            <groupId>jaxen</groupId>
            <artifactId>jaxen</artifactId>
            <version>1.1.6</version>
        </dependency>

public class NewXmlFile {
    public static void main(String[] args) throws IOException {
        // 创建Document对象
        Document document = DocumentHelper.createDocument();
        // 添加根节点
        Element root = document.addElement("members");

        // 添加一级节点
        Element studentsElement = root.addElement("students");
        Element teachersElement = root.addElement("teachers");

        // 添加二级节点并设置属性，dom4j改造了w3c的DOM接口，极大地简化了我们对节点的操作
        studentsElement.addElement("student").addAttribute("name", "张三").addAttribute("age", "18").addAttribute("location", "河南");
        studentsElement.addElement("student").addAttribute("name", "李四").addAttribute("age", "26").addAttribute("location", "新疆");
        studentsElement.addElement("student").addAttribute("name", "王五").addAttribute("age", "20").addAttribute("location", "北京");
        teachersElement.addElement("teacher").addAttribute("name", "zzs").addAttribute("age", "18").addAttribute("location", "河南");
        teachersElement.addElement("teacher").addAttribute("name", "zzf").addAttribute("age", "26").addAttribute("location", "新疆");
        teachersElement.addElement("teacher").addAttribute("name", "lt").addAttribute("age", "20").addAttribute("location", "北京");

        // ------------指定输出文件---------------
        File file = new File("members.xml");
        if (!file.exists()){
            file.createNewFile();
        }
        // 创建输出格式，不设置的话不会有缩进效果
        OutputFormat format = OutputFormat.createPrettyPrint();
        // format.setEncoding("UTF-8");
        // 获得XMLWriter
        XMLWriter writer = new XMLWriter(new FileWriter(file), format);
        // 打印Document
        writer.write(document);
        // 释放资源
        writer.close();

    }
}

结果

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

<members>
  <students>
    <student name="张三" age="18" location="河南"/>
    <student name="李四" age="26" location="新疆"/>
    <student name="王五" age="20" location="北京"/>
  </students>
  <teachers>
    <teacher name="zzs" age="18" location="河南"/>
    <teacher name="zzf" age="26" location="新疆"/>
    <teacher name="lt" age="20" location="北京"/>
  </teachers>
</members>