如何在Java中漂亮地打印XML属性？

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class PrettyPrintXML {
    public static void main(String[] args) {
        try {
            // 创建XML文档对象
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
            Document doc = docBuilder.newDocument();

            // 创建根元素
            Element rootElement = doc.createElement("root");
            doc.appendChild(rootElement);

            // 创建子元素
            Element childElement = doc.createElement("child");
            childElement.setAttribute("attribute1", "value1");
            childElement.setAttribute("attribute2", "value2");
            rootElement.appendChild(childElement);

            // 创建Transformer对象，用于输出XML
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes"); // 设置缩进
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4"); // 设置缩进空格数

            // 将XML文档转换为DOMSource对象
            DOMSource source = new DOMSource(doc);

            // 将DOMSource对象输出为XML文件或其他目标
            StreamResult result = new StreamResult(System.out); // 输出到控制台
            transformer.transform(source, result);

        } catch (ParserConfigurationException | TransformerException e) {
            e.printStackTrace();
        }
    }
}