Reading XML using Java

Question

I want to read all <temp >nodes map them to some variable and create one more XML.
I am stuck up in the first place itself where i need to read the data :( . I am getting null pointer exception, please find the code also.
<?xml version="1.0" encoding="UTF-8"?>
<ftpl id="47" name="XXXXXXXX xxx xxxxxxxx">
<abc-cab name="Systems" id="43434">
<abc-dr name="zzzzz" id="4545454">
<temp key="Type">null</param>
<temp key="Folder">/ZVZ/XXXXX - xyz</param>
<temp key="Author">XYZ,ABC</param>
<temp key="Comments">null</param>
<temp key="Mailed_By">XYZ,ABC</param>
<temp key="Subject">null</param>
<temp key="Key_Words">null</param>
<abc-page name="1" id="3524012">
<file text="/asas/asasa/asa/asas/Oxxxxxx2276744.txt" count="1"/>
</abc-page>
</abc-dr>
</abc-cab>
</ftpl>
try {
File file = new File("source-file");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(file);
doc.getDocumentElement().normalize();
System.out.println("Root element " + doc.getDocumentElement().getNodeName());
NodeList nodeLst = doc.getElementsByTagName("abc-dr");
for (int s = 0; s < nodeLst.getLength(); s++) {
Node fstNode = nodeLst.item(s);
if (fstNode.getNodeType() == Node.ELEMENT_NODE) {
Element fstElmnt = (Element) fstNode;
NodeList fstNmElmntLst = fstElmnt.getElementsByTagName("abc-dr");
Element fstNmElmnt = (Element) fstNmElmntLst.item(1);
NodeList fstNm = fstNmElmnt.getChildNodes();
System.out.println("First Node : " + ((Node) fstNm.item(1)).getNodeValue());
NodeList lstNmElmntLst = fstElmnt.getElementsByTagName("Folder");
Element lstNmElmnt = (Element) lstNmElmntLst.item(0);
NodeList lstNm = lstNmElmnt.getChildNodes();
} catch (Exception e) {
e.printStackTrace();
Please help.. let me know the code which read XML I have tried with all SAX/DOM i am getting same NUllPointerExcetion
Message was edited by:
JavaNewUser

Answer 1

Hi
Thanks patricknz
pls find the XMl and the java code
I have again modified the code .. but got the same result as below
[temp: null]----------------------param =
[temp: null]----------------------param =
[temp: null]----------------------param =
[temp: null]----------------------param =
[temp: null]----------------------param =
[temp: null]----------------------param =
[temp: null]----------------------param =
[abc-page: null]----------------------abc-page=
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import java.lang.*;
public class SampleDOM
    public static void main(String s[]){
        try{
            DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document document = docBuilder.parse("C:\\demo.xml");
               NodeList nodeList = document.getElementsByTagName("abc-dr");
      for (int i = 0, length1 = nodeList.getLength(); i < length1; i++) {
        final Element rDoc = (Element)nodeList.item(i);
        final NodeList rDocC = rDoc.getChildNodes();
        for (int j = 0, length2 = rDocC.getLength(); j < length2; j++) {
          final Node child = rDocC.item(j);
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            Element element = (Element)child;
            System.out.println(element.getChildNodes() + "----------------------" +
                                      new StringBuffer(element.getNodeName()).append(" = "));
        }catch(Exception e){
            e.printStackTrace();
}XML FIle:-
<?xml version="1.0" encoding="UTF-8"?>
<ftpl id="47" name="XXXXXXXX xxx xxxxxxxx">
     <abc-cab name="Systems" id="43434">
          <abc-dr name="zzzzz" id="4545454">
               <temp key="Type">null</param>
               <temp key="Folder">/ZVZ/XXXXX - xyz</param>
               <temp key="Author">XYZ,ABC</param>
               <temp key="Comments">null</param>
               <temp key="Mailed_By">XYZ,ABC</param>
               <temp key="Subject">null</param>
               <temp key="Key_Words">null</param>
               <abc-page name="1" id="3524012">
                    <file text="/asas/asasa/asa/asas/Oxxxxxx2276744.txt" count="1"/>
               </abc-page>
          </abc-dr>
     </abc-cab>
</ftpl>Message was edited by:
JavaNewUser
Message was edited by:
JavaNewUser