Question: Java--Xml Modify Node Value



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Java--Xml Modify Node Value
4 Answer(s)      7 years ago
Posted in : Java Beginners
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December 9, 2009 at 12:58 PM

Updating xml node is not sufficient to update that xml. You need to prepare whole xml again after updating the node. Use the following method to update xml.
* Writes the Document object into an XML file.
public static void createXMLFile(Document doc, File fileName)
OutputFormat format = new OutputFormat(doc);
XMLSerializer output = new XMLSerializer(new FileOutputStream(fileName), format);
System.out.println("File updated");
catch(Exception e){

Call this method after updationg node is completed.

Try this. I think this will help you.

December 9, 2009 at 1:26 PM

Thanks for your reply...its not working....Actually I could not even able to retrieve the element name inside the for loop...I am going wrong in the following lines..please correct me

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

for (int i=0; i<list.getLength(); i++) {
// Get element
Element element = (Element)list.item(i);

No Elements are getting printd to Console..Please help me in this regard...

December 9, 2009 at 4:56 PM


The above code works if the updation is successful. That code is not for getting the node values.

Whenever you are trying to update a node, first you need to check whether it is text node or element node.
If xml is like: <node1>
<node2>sample text</node2>

Here node2 is text node and node1 is element node.

setTextcontent() is for updating value in text nodes only. If you do this for element nodes , all nodes under element node are deleted and replaced with specified text content.

Here you are using:
//The following loop iterates only once even though you are gettting node list length 5.
for (int i=0; i<list.getLength(); i++) {
Node element = (Node)list.item(i); //When i=0, This gives root node object <or:AddOrder> as as single node
System.out.println("ele: "+element.getNodeName()); //This gives output as <or:AddOrder> as the first node is <or:AddOrder>
element.setTextContent("Prasanna"); //With this line, all nodes under <or:AddOrder> suppressed and replaced with Prasanna text ie., it changed as : <or:AddOrder>Prasanna</or:AddOrder>. So it wont iterate further.

Here you need put a condition and set text as follows: Replace the above line with following code:

if(element.getNodeName().equals("BuyersID") || element.getNodeName().equals("utcc:IssueDateTime") || element.getNodeName().equals("utcc:KCIType"))
System.out.println("node name: "+element.getNodeName()+"node text:"+element.getTextContent());
//Now set text content as u done above
element.setTextContent("Prasanna"); //This replaces text content for all the mentioned nodes. If you dont need that, put each node name in separate 'if' and do as you need for each node.


Instead of iterating all nodes using *, better getting the node list by specifying tag name.

For example,
if you want to retrieve the values of <BuyersID>,<utcc:IssueDateTime>,and <utcc:KCIType> through NodeList use the following code:

If you know the xml content( ie., if xml is not getting prepared at runtime) before accessing it, try to retrieve the node values as below:
//Getting all <BuyersID> nodes.

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

for (int i=0; i<list.getLength(); i++) {
System.out.println("list lenght: "+list.getLength());
// Get element
Node element = (Node)list.item(i);
System.out.println("node Name:: "+element.getNodeName()+" node text content:"+element.getTextContent()); //Here you will get values as <BuyersID> is text node.

//Update the node here if you want.

December 9, 2009 at 6:19 PM

Really thanks a lot for your patient reply.....Its working now...

I wish you a bright professional career ahead...

Once again thanks a lot...


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