java - 在 xml 字符串的第二行添加 xml-stylesheet

Question

如何在xml文件的第二行添加样式表，我已经编写了代码，但它在我的xml字符串文件的第一行添加了样式表，请参阅我的代码，它是工作代码，但它在xml字符串的第一行添加样式表，我的要求是在xml字符串的第二行添加xml样式表，请帮助

public class StringToDocumentToString {

    public static void main(String[] args)
            throws TransformerConfigurationException {
        String xmlstring = null;
        String filepath = "E:/C-CDA/MU2_CDA_WORKSPACE/AddingStylesheetTOxml/documentfile.txt";
        final String xmlStr = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n"
                + "<Emp id=\"1\"><name>Pankaj</name><age>25</age>\n"
                + "<role>Developer</role><gen>Male</gen></Emp>";

        Document doc2 = convertStringToDocument(xmlStr);
        Document doc1 = null;
        try {
            doc1 = addingStylesheet(doc2);
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String str = convertDocumentToString(doc1);
        System.out.println(str);
    }

    private static <ProcessingInstructionImpl> Document addingStylesheet(
            Document doc) throws TransformerConfigurationException,
            ParserConfigurationException {

        ProcessingInstructionImpl pi = (ProcessingInstructionImpl) doc
                .createProcessingInstruction("xml-stylesheet",
                        "type=\"text/xsl\" href=\"cda.xsl\"");
        Element root = doc.getDocumentElement();
        doc.insertBefore((Node) pi, root);
        return doc;

    }

    private static String convertDocumentToString(Document doc) {
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer;
        try {
            transformer = tf.newTransformer();
            // below code to remove XML declaration
            // transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION,
            // "yes");
            StringWriter writer = new StringWriter();
            transformer.transform(new DOMSource(doc), new StreamResult(writer));
            String output = writer.getBuffer().toString();
            return output;
        } catch (TransformerException e) {
            e.printStackTrace();
        }

        return null;
    }

    private static Document convertStringToDocument(String xmlStr) {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder;
        Document doc = null;
        try {
            builder = factory.newDocumentBuilder();
            doc = builder.parse(new InputSource(new StringReader(xmlStr)));

        } catch (Exception e) {
            e.printStackTrace();
        }
        return doc;
    }
}

Answer 1

改造前

transformer.transform(new DOMSource(doc), new StreamResult(writer));

尝试使用以下输出属性，

transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");