Extract an Element Value from an XML document.

[luthriaajay]

How can I get the value of a particular element in the flwg XML
using Java?

Value of Document newSingleOrderDocument is:

<?xml version="1.0" encoding="UTF-8"?>
<FIXML xmlns="http://www.fixprotocol.org/FIXML-4-4">
    <Order Acct="1" ExDest="ExchDest">
        <Hdr Snt="2007-04-05T13:34:47"/>
        <Instrmt Issr="Barclays" MMY="200903"/>
    </Order>
</FIXML>
 
 
I am getting a NullPointerException when I use this:
 
Element eissr= newSingleOrderDocument.getElementById("Issr");
System.out.println("ISSR Value is " + eissr.getNodeValue());
 
 
How can I get the value of  Element Issr? Please help.
 

[dorinbogdan]

You must read the Instrmt node, and then the Issr attribute.
Follow this procedure style:

import org.w3c.dom.Document;
import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Element;
....
public void showElementAttribs(Node node){
NamedNodeMap nNMap = node.getAttributes();
for (int i = 0; i < nNMap.getLength(); i++){
String item = nNMap.item(i).getNodeValue();
String name = nNMap.item(i).getNodeName();
System.out.println("ATTRIBUTE NAME :"+name+" \nVALUE :"+item);
}
System.out.println("*************");
 
}
 
//author: shamikjava 
 

[luthriaajay]

I am getting the nNMap.getLength() as NullPointer.

 
showElementAttribs(singleOrderDocument);
 
public void showElementAttribs(Node node){
NamedNodeMap nNMap = node.getAttributes();
 
for (int i = 0; i < nNMap.getLength(); i++){
String item = nNMap.item(i).getNodeValue();
String name = nNMap.item(i).getNodeName();
System.out.println("ATTRIBUTE NAME :"+name+" \nVALUE :"+item);
}
System.out.println("*************");
 
 

Any idea why this can be happening?

[r035198x]

I am getting the nNMap.getLength() as NullPointer.

 
showElementAttribs(singleOrderDocument);
 
public void showElementAttribs(Node node){
NamedNodeMap nNMap = node.getAttributes();
 
for (int i = 0; i < nNMap.getLength(); i++){
String item = nNMap.item(i).getNodeValue();
String name = nNMap.item(i).getNodeName();
System.out.println("ATTRIBUTE NAME :"+name+" \nVALUE :"+item);
}
System.out.println("*************");
 
 

Any idea why this can be happening?

the node.getAttributes() method returns null if the node is not an Element. are you sure this is not the case?

[luthriaajay]

I have solved the problem,
Thanks

[r035198x]

I have solved the problem,
Thanks

Care to share your solution?

[luthriaajay]

Sure.
This what I have done

The XML being returned to me is:

<?xml version="1.0" encoding="UTF-8"?>
<FIXML xmlns="http://www.fixprotocol.org/FIXML-4-4">
    <Order Acct="1" ExDest="ExchDest">
        <Hdr Snt="2007-04-05T13:34:47"/>
        <Instrmt Issr="Barclays" MMY="200903"/>
    </Order>
</FIXML>
 
 

So what I did was this :

private void extractValues(Node n){
 
Node firstChildNode=null;
Node n3;
 
NodeList nodeList = n.getChildNodes();
for (int i=0; i< nodeList.getLength(); i++) {
firstChildNode = nodeList.item(i);
}
 
// Get the Second child which is Order
NodeList nodeList2 = firstChildNode.getChildNodes();
 
for (int i=0; i< nodeList2.getLength(); i++) {
 
   n3 = nodeList2.item(i);
 
   NamedNodeMap nNMapOrder =  n3.getAttributes();
 
   for (int x = 0; x < nNMapOrder.getLength(); x++){
 
 
   String nodeName = nNMapOrder.item(x).getNodeName();
 
   if(nodeName.equals("Acct")){
   String acct = nNMapOrder.item(x).getNodeValue();
   }
 
   if(nodeName.equals(" ExDest")){
   String exch = nNMapOrder.item(x).getNodeValue();
    }
 
}