Java - 如何将XML字符串转换为XML文件？

Question

我想将xml字符串转换为xml文件.我得到一个xml字符串作为输出,我到目前为止有以下代码:

public static void stringToDom(String xmlSource) 
    throws SAXException, ParserConfigurationException, IOException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document doc = builder.parse(new InputSource(new StringReader(xmlSource)));
        //return builder.parse(new InputSource(new StringReader(xmlSource)));
    }

但是我不太确定我从哪里开始.我不是在任何地方创建文件,所以如何将其合并到其中？

我将我的xml字符串传递给xmlSource.

Answer 1

如果您只想将String的内容放在一个文件中,那么它实际上是否与XML无关.您可以跳过解析(这是一个相对昂贵的操作)并只是转储String到文件,如下所示:

public static void stringToDom(String xmlSource) 
        throws IOException {
    java.io.FileWriter fw = new java.io.FileWriter("my-file.xml");
    fw.write(xmlSource);
    fw.close();
}

如果你想要安全并避免编码问题,正如Joachim所指出的那样,你需要解析.由于从不信任您的输入的良好做法,这可能是更好的方式.它看起来像这样:

public static void stringToDom(String xmlSource) 
        throws SAXException, ParserConfigurationException, IOException {
    // Parse the given input
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(new InputSource(new StringReader(xmlSource)));

    // Write the parsed document to an xml file
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    DOMSource source = new DOMSource(doc);

    StreamResult result =  new StreamResult(new File("my-file.xml"));
    transformer.transform(source, result);
}