user2325154 user2325154 - 6 months ago 190
Java Question

How to remove xmlns attribute from the root element in xml and java

I would like to remove the

xmlns
attribute from following xml string. I have written a
java
program but not sure if it does what needs to be done here.

How do I remove the
xmlns
attribute and get the modified xml string ?

Input XML string:

<?xml version="1.0" encoding="UTF-8"?>
<Payment xmlns="http://api.com/schema/store/1.0">
<Store>abc</Store>
</Payment>


Expected XML Output string:

<?xml version="1.0" encoding="UTF-8"?>
<Payment>
<Store>abc</Store>
</Payment>


Java Class:

public class XPathUtils {

public static void main(String[] args) {
String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Payment xmlns=\"http://api.com/schema/store/1.0\"><Store>abc</Store></Payment>";
String afterNsRemoval = removeNameSpace(xml);
System.out.println("afterNsRemoval = " + afterNsRemoval);
}

public static String removeNameSpace(String xml) {
try {
System.out.println("before xml = " + xml);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
InputSource inputSource = new InputSource(new StringReader(xml));
Document xmlDoc = builder.parse(inputSource);
Node root = xmlDoc.getDocumentElement();
NodeList rootchildren = root.getChildNodes();
Element newroot = xmlDoc.createElement(root.getNodeName());
for (int i = 0; i < rootchildren.getLength(); i++) {
newroot.appendChild(rootchildren.item(i).cloneNode(true));
}
xmlDoc.replaceChild(newroot, root);
return xmlDoc.toString();
} catch (Exception e) {
System.out.println("Could not parse message as xml: " + e.getMessage());
}
return "";
}
}


Output:

before xml = <?xml version="1.0" encoding="UTF-8"?><Payment xmlns="http://api.com/schema/store/1.0"><Store>abc</Store></Payment>

afterNsRemoval = [#document: null]

Answer

This is the code to do it with XPath and vtd-xml( of which I am the author)...

import com.ximpleware.*;
import java.io.*;

public class removeAttrNode {
    public static void main(String[] s) throws VTDException, Exception{
        VTDGen vg = new VTDGen(); ByteArrayOutputStream baos = new ByteArrayOutputStream();
        String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Payment xmlns=\"http://api.com/schema/store/1.0\"><Store>abc</Store></Payment>";
        vg.setDoc(xml.getBytes());
        vg.parse(false); // turn off namespace awareness so that 
        VTDNav vn = vg.getNav();
        AutoPilot ap = new AutoPilot(vn);
        XMLModifier xm = new XMLModifier(vn);
        ap.selectXPath("//@xmlns");
        int i=0;
        while((i=ap.evalXPath())!=-1){
            xm.remove();
        }
        xm.output(baos);
        System.out.println(baos.toString());    
    }
}