How to retrieve specific element (or nodelist) within an existing element from DOM in Java

I am trying to parse an XML file which contains multiple records of name A. Each A has multiple group records with name B . The various records within B have names x, y an开发者_如何转开发d z.

My questions are:

• How do I navigate to B and
• how do I obtain all values of x in loop.

The DOM is set to the document (i.e. elements of name "A")

I am using a DOM parser in Java.

Sample record:

<A>
  <B><x>123</x><y>asdf</y><z>A345</z></B>
  <B><x>987</x><y>ytre</y><z>Z959</z></B>
</A>

    Document yourDom = ....;

    XPathFactory xpf = XPathFactory.newInstance();
    XPath xp = xpf.newXPath();

    XPathExpression xpe = xp.compile("//A/B/*");
    NodeList nodes = (NodeList) xpe.evaluate(yourDom, XPathConstants.NODESET);

Apart from using the standard DOM API directly which is usually a bit verbose for these tasks, you could also use jOOX as a jquery-like wrapper for DOM. Here's an example how to use it:

// Loop over all x element values within B using css-style selectors
for (String x : $(document).find("B x").texts()) {
  // ...
}

// Loop over all x element values within B using XPath
for (String x : $(document).xpath("//B/x").texts()) {
  // ...
}

// Loop over all x element values within B using the jOOX API
for (String x : $(document).find("B").children("x").texts()) {
  // ...
}