Creating a node in an XML Document

Question

Hi!
i need to insert a new element in an existing xml document. for example,
<bookinfo>
<book>
<bookname>A</bookname>
<author>B</author>
</book>
<book>
<bookname>C</bookname>
<author>D</author>
</book>
</bookinfo>
In this document if i want to insert another element using Xpath, say,<publisher> in <book> node, how to insert it.
I'm using DOM parser for parsing the xml file.
Any help to solve this issue appreciated.
Thanks in advance.

Answer 1

final class Foo {
    private static final String MARKUP =
        "<bookinfo>\n" +
          "<book isbn='1234'>\n" +
          "<bookname>A</bookname>\n" +
          "<author>B</author>\n" +
          "</book>\n" +
          "<book isbn='5678'>\n" +
          "<bookname>C</bookname>\n" +
          "<author>D</author>\n" +
          "</book>\n" +
          "</bookinfo>";
    private Foo() {
        super();
    public static final void main(final String[] args)
        throws XPathExpressionException {
        String isbn = args.length > 0 ? args[0] : "1234";
        String publisher = args.length > 1 ? args[1] : "Sample Publisher";
        Document document = ...  // Initialize somehow
        XPath xpath = XPathFactory.newInstance().newXPath();
        String expression = "//bookinfo/book[@isbn=" + isbn + "]";
        Element book = (Element) xpath.evaluate(expression, document.getDocumentElement(), XPathConstants.NODE);
        if (book == null) {
            throw new RuntimeException("Unable to find ISBN " + isbn);
        Element newPublisher = document.createElement("publisher");
        newPublisher.setAttribute("name", publisher);
        book.appendChild(newPublisher);
}- Saish