Java 用流结果覆盖文件

Question

我创建了一个简单的类来创建 XML 文档。但是，如果我在创建同名文档时多次调用该方法，则该文件不会被覆盖。如何使该类自动覆盖同名的现有文件？

import java.io.File;
import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;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 XMLCreater {    public static void CreateXMLDoc(String name, String root, String[] elements, String[] children) throws TransformerConfigurationException {        try {            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();            Document doc = docBuilder.newDocument();            Element rootElement = doc.createElement(root);            doc.appendChild(rootElement);
        for (int i = 0; i < elements.length; i ++) {
            Element element = doc.createElement(elements[i]);
                element.appendChild(doc.createTextNode(children[i]));
            rootElement.appendChild(element);
        }
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        DOMSource source = new DOMSource(doc);
        File dir = new File(System.getProperty("user.dir"));
        StreamResult result =  new StreamResult(new File(dir + "\\XML\\" + name + ".xml"));
        transformer.transform(source, result);
    }
    catch(ParserConfigurationException pce){
          pce.printStackTrace();
    } catch(TransformerException tfe) {
         tfe.printStackTrace();
    }
}

}

Answer 1

我使用以下语句执行了您的代码:

public static void main (String[] args) 
{
    XMLCreater x = new XMLCreater();
    String[] s = {"A","B","C"};
    try 
    {
        x.CreateXMLDoc("k","root",s,s);
        x.CreateXMLDoc("k","root",s,s);
        x.CreateXMLDoc("fakih","root",s,s);
    }
    catch (TransformerConfigurationException exception) 
    { exception.printStackTrace(); }
}

而且它很好地覆盖了现有的文件，覆盖没有问题，你自己检查一下。