Java HTML / XML How to - Remove attribute by name








Question

We would like to know how to remove attribute by name.

Answer

/*from   ww  w. ja  va  2 s . c om*/
import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;

public class Main {
  public static String getXMLData() {
    return "<a attr='value'></a>";
  }

  public static void main(String[] argv) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    Document doc = factory.newDocumentBuilder().parse(
        new InputSource(new StringReader(getXMLData())));

    removeAttribute(doc.getDocumentElement(),"attr");

    System.out.println(documentToString(doc));

  }
  public static void removeAttribute( Node node, String attName ) {
    NamedNodeMap attributes=node.getAttributes();
    attributes.removeNamedItem(attName);                
  }
  public static String documentToString(Document document) {
    try {
      TransformerFactory tf = TransformerFactory.newInstance();
      Transformer trans = tf.newTransformer();
      StringWriter sw = new StringWriter();
      trans.transform(new DOMSource(document), new StreamResult(sw));
      return sw.toString();
    } catch (TransformerException tEx) {
      tEx.printStackTrace();
    }
    return null;
  }
}

The code above generates the following result.