<?xml version="1.0"?>
      <personaldetails>
          <phno>1553294232</phno>
          <email>
                <official>xya@gmail.com</official>
                <personal>bk@yahoo.com</personal>
          </email>
      </personaldetails>

1553294232
xya@gmail.com
bk@yahoo.com

public void parseXML(){
    try{
        DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document doc;

        doc = documentBuilder.parse(new File("test.xml"));
        getData(null, doc.getDocumentElement());
    }catch(Exception exe){
        exe.printStackTrace();
    }
}

private void getData(Node parentNode, Node node){

    switch(node.getNodeType()){
        case Node.ELEMENT_NODE:{

            if(node.hasChildNodes()){
                NodeList list = node.getChildNodes();
                int size = list.getLength();

                for(int index = 0; index < size; index++){
                    getData(node, list.item(index));
                }
            }

            break;
        }

        case Node.TEXT_NODE:{
            String data = node.getNodeValue();

            if(data.trim().length() > 0){
                /*
                 * Here you need to check the data against your ruleset and perform your operation
                 */
                System.out.println(parentNode.getNodeName()+" :: "+node.getNodeValue());
            }
            break;
        }

    }
}