如何使用Java代码将XML文件转换为CSV？

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

public class XMLtoCSVConverter {
    public static void main(String[] args) {
        String xmlFilePath = "input.xml";
        String csvFilePath = "output.csv";

        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(xmlFilePath);

            FileWriter csvWriter = new FileWriter(csvFilePath);

            NodeList nodeList = document.getDocumentElement().getChildNodes();
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    Element element = (Element) node;
                    List<String> rowData = new ArrayList<>();
                    NodeList childNodes = element.getChildNodes();
                    for (int j = 0; j < childNodes.getLength(); j++) {
                        Node childNode = childNodes.item(j);
                        if (childNode.getNodeType() == Node.ELEMENT_NODE) {
                            rowData.add(childNode.getTextContent());
                        }
                    }
                    csvWriter.append(String.join(",", rowData));
                    csvWriter.append("\n");
                }
            }

            csvWriter.flush();
            csvWriter.close();

            System.out.println("XML to CSV conversion completed.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}