generating XML document using Java

[Varalakshmi Ramanarayan]

Hi all,

How can I genrate a XML document using Java? What are the imports that I have to use? Also, Please let me know JAXP is helpful in this.
Please Help me with a few examples..

Thanks in advance

[Ulf Dittmer]

Here's an example of how to create XML using DOM and the JAXP API.

[Varalakshmi Ramanarayan]

Ulf,

This is exaclty what I was looking for.
Thanks very much for your help.

Regards.

[Varalakshmi Ramanarayan]

Ulf,

I have one more problem now . After generating and populating the XML, from other part of my program I need to read the text in each element node.
and i tried using the below code

  NodeList var1 = doc.getElementsByTagName("optionsIndex");
        Element ele1 = (Element)var1.item(0); 
        NodeList text1 = ele1.getChildNodes();// here
        String optionsIndexString = ((Node)text1.item(0)).getNodeValue();
        

But on the line marked 'here' I am getting a nullPointer exception (the ele1 is null). For this method I am passing (Document doc,Element root) as the parameters. I am not able to figure out why ele1 is not getting a value.
I am using this code to generete the XML

  DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = dbfac.newDocumentBuilder();
            doc = docBuilder.newDocument();
 
            //Creating the XML tree 
            //create the root element and add it to the document
            Element root = doc.createElement("root");
            doc.appendChild(root);
 
            //create a comment and put it in the root element
            
            Element child1 = doc.createElement("OptionsIndex");
            root.appendChild(child1);
            Text text1 = doc.createTextNode(String.valueOf(optionsIndex));
            child1.appendChild(text1);
            
            Element child2 = doc.createElement("inputRoute");
            root.appendChild(child2);
            Text text2 = doc.createTextNode(inputRoute);
            child2.appendChild(text2);  
            ....

A sample of my XML document is below.

  
<base>
<OptionsIndex>0</OptionsIndex>
<inputRoute>a,b</inputRoute>
...
</base>
  

PLease help me to solve this problem.

Thanks.

[Ulf Dittmer]

Could the problem be that the document contains "OptionsIndex" elements, while the code looks for "optionsIndex"?

[Varalakshmi Ramanarayan]

Ulf,

You are right. That was the problem.
I should have looked at the code more carefully.
thanks again for your help.

Regards.