使用单个Java程序将多个XML文件转换为CSV？

Question

首先，我为一个工作正常的XML编写了代码。现在，我正在尝试转换多个文件，这会导致错误。我把代码放在多个文件中。 诸如未报告的异常ParserConfigurationException，SAXException之类的错误；

import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.w3c.dom.Document;
class Xml2Csv {
    public static void main(String args[]) throws IOException {
        // Path of folder where files are located 
        String folder_path = "C:\\Users\\SPARK\\Desktop\\javaf\\flir"; 
        // creating new folder 
        File flir = new File(folder_path); 
        File[] file_array = flir.listFiles(); 
        for (int i = 0; i < file_array.length; i++) 
        { 
            if (file_array[i].isFile()) 
            { 
                //xsl stylesheet
                File stylesheet = new File("C:\\Users\\SPARK\\Desktop\\javaf\\style.xsl");
                File xmlSource = new File(folder_path + "\\" + file_array[i]);
                String file_name = file_array[i].getName();
                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                DocumentBuilder builder = factory.newDocumentBuilder();
                Document document = builder.parse(xmlSource);
                StreamSource stylesource = new StreamSource(stylesheet);
                Transformer transformer = TransformerFactory.newInstance()
            .newTransformer(stylesource);
                Source source = new DOMSource(document);
                Result outputTarget = new StreamResult(new File(file_name + ".csv"));
                transformer.transform(source, outputTarget);
                }
            }
    }
}