XML parsing with dom

[sanjeev kumar mandal]

Hi All,

I am new to xml parsing and i have written a java program to dynamically add element to an existing xml. But the program is not adding element. Please any body correct me if i have done any mistake in the code .

I am sending the sample xml and java code below.

AddElement.java code below====

DocumentBuilder db = dbf.newDocumentBuilder();
Document dom = db.parse("C:/DspaceAndMoodleProject/workspace/vocab/srsc.xml");
Element docEle = dom.getDocumentElement();
NodeList nl = docEle.getElementsByTagName("node");
if(nl != null && nl.getLength() > 0) {
for(int i = 0 ; i < nl.getLength();i++) {


Element el = (Element)nl.item(i);

if(el.getAttribute("label").equalsIgnoreCase("Church studies")){
System.out.println(" print label : " +el.getAttribute("label"));
System.out.println(" print id : " +el.getAttribute("id"));
Element createIsComposedByTag = dom.createElement("isComposedBy");
el.appendChild(createIsComposedByTag);
Element newNodeTag = dom.createElement("node");
newNodeTag.setAttribute("id", "0099019");
newNodeTag.setAttribute("label", "lecture on cristionity");
Element newHasNote = dom.createElement("hasNote");
newHasNote.setNodeValue("value shilong");
newNodeTag.appendChild(newHasNote);
createIsComposedByTag.appendChild(newNodeTag);
}
}
}

// end of java code


//==== srsc.xml file===

<?xml version="1.0" encoding="UTF-8"?>
<node id="ResearchSubjectCategories" label="Research Subject Categories">
<isComposedBy>
<node id="SCB11" label="HUMANITIES and RELIGION">
<isComposedBy>

<node id="VR110103" label="Church studies">
<hasNote>Kyrkovetenskap</hasNote>
</node>
<node id="VR110105" label="Systematic theology">
<hasNote>Systematisk teologi</hasNote>
</node>

<node id="VR110106" label="Islamology">
<hasNote>Islamologi</hasNote>
</node>
</isComposedBy>
<hasNote>publisher</hasNote>
</node>

<node id="SCB15" label="socisl science">
<isComposedBy>

<node id="VR11016" label="socisl studies">
<hasNote>socisl</hasNote>
</node>
<node id="VR1107" label="socisl abc">
<hasNote>abc</hasNote>
</node>

<node id="VR118" label="magnetism">
<hasNote>magnetic</hasNote>
</node>
</isComposedBy>
<hasNote>social studies by mit</hasNote>
</node>


</isComposedBy>
<hasNote>Research stusies</hasNote>
</node>

[William Brogden]

But the program is not adding element.

You may have changed the DOM in memory but the original document file will be unchanged unless you write the new DOM over it.

Using the code tags would make it a lot easier to read your post.

Bill