code to read the xml and also overide the value of certain attributes in xml at runtime itself

[Saral Saxena]

Hi Folks ,

I have got the following xml ...

<?xml version="1.0" encoding="UTF-8" standalone="no" ?> 
<company>
   <staff id="2">
	<lastname>mook< /lastname>
	<nickname>abhgr</nickname>
	<salary>2000000</salary> 
        <age>28</age> 
   </staff>
</company>

Now I need java code that wil read the values of the attributes like lastname ,nickname,salary,age at the runtime and also I want to override the value of the lastname from mook to saral saxena then MY JAVA CLASS WOULD DO IT AT RUNTIME..!!! Please guide me for the code of java class..!!

[fred rosenberger]

There should be plenty of xml parsers out there. Have you tried googling for any of them? The very first hit I got looks promising for what you need.

[Saral Saxena]

Hi Fred ,

yeah I have seen sax parser and dom parser ....I need if somebody can come up with the java code through which I can look upon and see the flow..!!this will make my understanding more clearer..!! thanks in advance..!!

[fred rosenberger]

If you expect someone to provide you the code, you are in the wrong place. That isn't what we do here.

We will help YOU write the code yourself. I suggest you spend some time reading our HowToAskQuestionsOnJavaRanch FAQ. Specifically:

ShowSomeEffort
PatienceIsAVirtue
NotACodeMill
DoYourOwnHomework
PostRealCode

[Saral Saxena]

Hi ,
I have written the folowing code...

import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
 
public class ModifyXMLFile {
 
	public static void main(String argv[]) {
 
	   try {
		String filepath = "c:\\file.xml";
		DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
		Document doc = docBuilder.parse(filepath);
 
		// Get the root element
		Node company = doc.getFirstChild();
 
		// Get the staff element , it may not working if tag has spaces, or
		// whatever weird characters in front...it's better to use
		// getElementsByTagName() to get it directly.
		// Node staff = company.getFirstChild();
 
		// Get the staff element by tag name directly
		Node staff = doc.getElementsByTagName("staff").item(0);
 
		// update staff attribute
		NamedNodeMap attr = staff.getAttributes();
		Node nodeAttr = attr.getNamedItem("id");
		nodeAttr.setTextContent("2");
 
		// append a new node to staff
		Element age = doc.createElement("age");
		age.appendChild(doc.createTextNode("28"));
		staff.appendChild(age);
 
		// loop the staff child node
		NodeList list = staff.getChildNodes();
 
		for (int i = 0; i < list.getLength(); i++) {
 
                   Node node = list.item(i);
 
		   // get the salary element, and update the value
		   if ("salary".equals(node.getNodeName())) {
			node.setTextContent("2000000");
		   }
 
                   //remove firstname
		   if ("firstname".equals(node.getNodeName())) {
			staff.removeChild(node);
		   }
 
		}
 
		// write the content into xml file
		TransformerFactory transformerFactory = TransformerFactory.newInstance();
		Transformer transformer = transformerFactory.newTransformer();
		DOMSource source = new DOMSource(doc);
		StreamResult result = new StreamResult(new File(filepath));
		transformer.transform(source, result);
 
		System.out.println("Done");
 
	   } catch (ParserConfigurationException pce) {
		pce.printStackTrace();
	   } catch (TransformerException tfe) {
		tfe.printStackTrace();
	   } catch (IOException ioe) {
		ioe.printStackTrace();
	   } catch (SAXException sae) {
		sae.printStackTrace();
	   }
	}
}

[Saral Saxena]

Hi Folks,

Please advise on this ..I am stuck up on this...doing R&D..!!

[John Jai]

Ok - please explain what the code does; what is the output you got; exceptions thrown, etc.

[fred rosenberger]

Does the code compile? Do you know HOW to compile it? Does it run? Does it crash?

Clearly, you didn't read the FAQ as I suggested. If so, you'd know to TellTheDetails.

Folks around here tend to put as much effort into answering your question as you put into asking it. Since you are putting in almost nothing, you are getting out almost nothing. You should make it easy for us to help you, and you are not. So, most folks figure they can either spend a LOT of time trying to figure out what help you need and ultimately help one person, or spend a little time helping each of a lot of folks. Most people I know will choose the latter.