Java How to extract a complete XML block

Question

Using this XML example:

  
    0
  
  
    1
  

<         


        

Answer 1

The expression needed to refer to that second B element should look something like this:

/*/B[id='1']

Or, if the target node is at an unknown position in the document, use:

//B[id='1']

Full Java example (assuming the XML is in a file called workbook.xml):

DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document doc = builder.parse("workbook.xml");
XPath xpath = XPathFactory.newInstance().newXPath();
XPathExpression expr = xpath.compile("//B[id='1']");        

NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodes.getLength(); i++) {
    System.out.println("[" + nodes.item(i) + "]");
}