Question

我有xml字符串文件，我想在xml字符串文件的seconed行添加xml-stylesheet。但是下面给出的代码给出了这样的输出：首先是xml-string文件，然后在xml字符串文件的末尾附加xml-stylesheet，但我希望样式表位于我的xml-string的seconed行。请告诉我该怎么做。感谢。

我的代码是：

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=\"my.stylesheet.xsl\"");
    Element root = doc.createElement("root-element");
    doc.appendChild(root);

    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

语句Element root = doc.createElement("root-element");创建一个名为root-element的新元素，当您调用doc.appendChild(root);时，实际上是将其附加到文档的末尾。因此，在这两个声明之后，您的文档将是这样的：

<?xml version="1.0" encoding="UTF-8"?>
<Emp id="1">
    <name>Pankaj</name>
    <age>25</age>
    <role>Developer</role>
    <gen>Male</gen>
</Emp>
<root-element/>

然后你有doc.insertBefore((Node) pi, root);导致在这个新添加的元素之前添加样式表处理指令。

要解决此问题，您必须检索指向文档根元素的指针（而不是添加名为root-element的新元素），然后在它之前添加pi。这可以通过调用getDocumentElement()对象的doc方法来实现。因此，为了解决问题，您只需在main方法中使用以下代码：

Element root = doc.getDocumentElement();
doc.insertBefore((Node) pi, root);

在第二行的现有xml文件中添加xml-stylesheet

1 个答案: