Child node name in a xml

Question

I am trying to write a piece of code that can parse any xml and print its contents. I am using DOM parser. I am able to get the name of the root tag of the xml, but cant obtain tag name of the immediate child. This can be done easily in case the node names are known by using the method 'getElementsByTagName' . Is there any way out of this dilemma ?

My code goes like this :

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(file);
doc.getDocumentElement().normalize();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
doc.getDocumentElement().getNodeName() // this gets me the name of the root node.

Now how can i get the name of the immediate child node so that i can traverse the xml using getElementsByTagName("x").

Thanks in advance.

Andreas Dolk · Accepted Answer · 2011-07-06 11:25:01Z

3

getChildNodes() returns all children of an element. The list will contain more then just elements so you'll have to check each child node if it is an element:

NodeList nodes = doc.getDocumentElement().getChildNodes();
for (int i = 0; i < nodes.getLength(); i++) {
  Node node = nodes.get(i);
  if (node instanceof Element) {
    Element childElement = (Element) node;
    System.out.println("tag name: " + childElement.getTagName());
  }
}

answered Jul 6, 2011 at 11:25

Andreas Dolk

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2 Comments

mallardz Over a year ago

Maybe this has changed but shouldn't it be: nodes.item(i)

Zeb Over a year ago

@Andreas_D ! I found two method in NodeList APIs. You can see docs.oracle.com/javase/7/docs/api/org/w3c/dom/NodeList.html . The point is that the method nodes.get(i); is not define in NodeList.

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