Xml parsing using sun parser with servlet

Xml parsing using sun parser with servlet are given below:

Import following packages:

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Element;

Then parsing your xml data which is given by parameter:

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
String xmlRequest = new String(request.getParameter("xml")); // get parameter
Document doc = db.parse(new InputSource(new StringReader(xmlRequest)));
NodeList nodeLst = doc.getElementsByTagName("clientUpdate");
Node fstNode = nodeLst.item(0);
Element fstElmnt = (Element) fstNode;

String clcref="";
    NodeList fstNmElmntLst = fstElmnt.getElementsByTagName("CL.CREF");
    Element fstNmElmnt = (Element) fstNmElmntLst.item(0);
    NodeList fstNm = fstNmElmnt.getChildNodes();
    clcref=((Node) fstNm.item(0)).getNodeValue();
}catch(Exception e ){

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