Re: [xml-dev] adding new attribute to an existing xml fileusing JAXPwith DOM

[Prakash <prakash.subramaniam@oracle.com>]

Hi Rahil,

I don't see anything wrong in your code.

This may be a stupid question, but it is better for conform:

Did you finally persist the DOM tree back to test.xml after modifications?

Thanks,
Prakash



Rahil wrote:

Hi

This is my first post to this forum and Im hoping to get some suggestions as Im completely exhausted trying to resolve my query.

My query is to add a new attribute to a selected node in an existing xml file.

I have a test.xml file whose structure is such:

<Top>
   <Tags>
        <Tag id="123" name="Home">
           <Value>Inner Text</Value>
       </Tag>
   </Tags>
</Top>

Now using the JAXP DocumentBuilder I am able to access the attribute @name from the <Tag> node. I then want to insert a new attribute @new="some value" to this <Tag> node. But despite trying out several options Im not able to. I want to do something similar with the <Value> node as well and append some InnerText to the existing one.

My code so far is:
--------------------------------
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(test.xml);

NodeList list = doc.getElementsByTagName("Tag");

for(int i=0; i<list.getLength();i++){
Element tagNode = (Element)list.item(i); //<Tag>
nm = tagNode.getAttributes();

for(int j=0;j<nm.getLength();j++){
   Node ndNm = nm.item(j); // id, name --attributes names
   nodeLocNm = ndNm.getNodeName();

   if(nodeLocNm.equals(new String("name"))){
       String nodeVal = nm.item(j).getNodeValue(); //@name value -- do something
       String newRes = "new value";
       tagNode.setAttribute("new", "new value");
   }
}
}

--------------------------------------------------

Of course no attribute @name gets added to test.xml which is my problem !

Could someone please help.

Thanks in advance to everyone for helping out!
Rahil


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