1.引入依赖

<dependency>
    <groupId>org.dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>2.1.3</version>
</dependency>

2.生成xml

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.junit.Test;

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

public class Dom4jXml {
    @Test
    public void test() {
        long start = System.currentTimeMillis();
        createXml();
        System.out.println("运行时间: "+ (System.currentTimeMillis() - start) / 1000 + "s");
    }

    public static void createXml() {
        try {
            // 创建document对象
            Document document = DocumentHelper.createDocument();
            // 创建根节点rss
            Element rss = document.addElement("rss");
            // 向rss节点添加属性
            rss.addAttribute("version", "2.0");
            // 向rss节点添加子节点
            Element channel = rss.addElement("channel");
            Element title = channel.addElement("title");
            title.setText("国内最新新闻");
            // 设置生成xml的格式
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF-8");
            // 生成xml文件
            File file = new File("rss.xml");
            System.out.println("file = " + file.getAbsolutePath());
            XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
            // 设置是否转义，默认使用转义字符
            writer.setEscapeText(false);
            writer.write(document);
            writer.close();
            System.out.println("生成xml文件成功");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("生成xml文件失败");
        }
    }
}

3.生成结果

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

<rss version="2.0">
  <channel>
    <title>国内最新新闻</title>
  </channel>
</rss>