I was trying to parse following strings to form a xml document and then trying to extract all child nodes of and add to a different document object which is already available to me.
<dhruba><test>this</test>that<test2>wang chu</test2> something.... </dhruba> <dhruba>this is text node <test>this</test>that<test2>wang chu</test2> anything..</dhruba>
while I am trying to read the child nodes, it is returning null child for TEXT_NODE for 1st string and null for ELEMENT_NODE for 2nd String, this is wrong, is it API problem ??
I am using following code … it compile , I am using java 6.
Node n = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
db = dbf.newDocumentBuilder();
} catch (ParserConfigurationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
dom = db.newDocument();
Element rootEle = dom.createElement("resources");
// adding the root element to the document
dom.appendChild(rootEle);
Element element = dom.createElement("string");
element.setAttribute("name", "some_name");
try {
n = db.parse(new InputSource(new StringReader("<dhruba><test>this</test>that<test2>node value</test2> some text</dhruba>"))).getDocumentElement();
n = dom.importNode(n, true);
NodeList nodeList = n.getChildNodes();
int length = nodeList.getLength();
System.out.println("Total no of childs : "+length);
for(int count = 0 ; count < length ; count++ ){
Node node = nodeList.item(count);
if(node != null ){
element.appendChild(node);
}
}
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
rootEle.appendChild(element);
INPUT :: as string
<dhruba><string name="some_name">
that
<test>this</test>
<test2>node value</test2>
some text
</string>
</dhruba>
EXPECTED OUTPUT :: as document
<string>
<string name="some_name">
<test>this</test>
<test2>node value</test2>
</string>
</string>
if I try to parse
<test>this</test>that<test2>wang chu</test2> something....
then output comes as “thiswang chu”
Why is this happening? what needs to be done if I want to add following node under another document element, i.e. <string>.
<test>this</test>
that
<test2>node value</test2>
some text
[notice that it does not have <dhruba>] inside parent node of another
document.
Hope I am clear. Above code compiles in Java 6
Answer
Probably you want Node.cloneNode() method:
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document dom = db.newDocument();
Element element = dom.createElement("string");
element.setAttribute("name", "some_name");
String inputXMLString =
"<dhruba><test>this</test>that<test2>node value</test2> some text</dhruba>";
Node n = db.parse(new InputSource(new StringReader(inputXMLString))).getDocumentElement();
n = dom.importNode(n, true);
NodeList nodeList = n.getChildNodes();
for (int i = 0; i < nodeList.getLength(); ++i)
{
Node node = nodeList.item(i);
element.appendChild(node.cloneNode(true));
}
dom.appendChild(element);
To get dom into stdout or file you could write:
TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer transformer = tFactory.newTransformer(); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes"); DOMSource source = new DOMSource(dom); StreamResult result = new StreamResult(System.out); transformer.transform(source, result);
Result:
<string name="some_name"> <test>this</test>that<test2>node value</test2> some text</string>