使用dom4j在xml文档上添加元素

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

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.dom4j.io.OutputFormat;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class Dom4jExample {
    public static void main(String[] args) {
        try {
            // 读取现有的 XML 文件
            File inputFile = new File("input.xml");
            SAXReader reader = new SAXReader();
            Document document = reader.read(inputFile);

            // 获取根元素
            Element root = document.getRootElement();

            // 创建新的元素并添加到根元素
            Element newElement = root.addElement("newElement");
            newElement.addAttribute("attribute", "value");
            newElement.addText("This is a new element");

            // 输出修改后的 XML 到文件
            OutputFormat format = OutputFormat.createPrettyPrint();
            XMLWriter writer = new XMLWriter(new FileWriter("output.xml"), format);
            writer.write(document);
            writer.close();

            System.out.println("New element added and XML file updated successfully.");
        } catch (DocumentException | IOException e) {
            e.printStackTrace();
        }
    }
}

<root>
    <existingElement>Existing content</existingElement>
</root>

<root>
    <existingElement>Existing content</existingElement>
    <newElement attribute="value">This is a new element</newElement>
</root>