public static Node findChildWithAtt(Node parent,
    String elemName,
    String attName,
    String attVal) 
{
        
        Node child=DomUtil.getChild(parent, Node.ELEMENT_NODE);
        if( attVal== null ) {
            while( child!= null &&
                    ( elemName==null || elemName.equals( child.getNodeName())) && 
                    DomUtil.getAttribute(child, attName) != null ) {
                child=getNext(child, elemName, Node.ELEMENT_NODE );
            }
        } else {
            while( child!= null && 
                    ( elemName==null || elemName.equals( child.getNodeName())) && 
                    ! attVal.equals( DomUtil.getAttribute(child, attName)) ) {
                child=getNext(child, elemName, Node.ELEMENT_NODE );
            }
        }
        return child;
}

Find the first direct child with a given attribute.

 public static String getAttribute(Node element,
    String attName) 
{
        NamedNodeMap attrs=element.getAttributes();
        if( attrs==null ) return null;
        Node attN=attrs.getNamedItem(attName);
        if( attN==null ) return null;
        return attN.getNodeValue();
}

 public static Node getChild(Node parent,
    String name) 
{
        if( parent==null ) return null;
        Node first=parent.getFirstChild();
        if( first==null ) return null;
        for (Node node = first; node != null;
             node = node.getNextSibling()) {
            //System.out.println("getNode: " + name + " " + node.getNodeName());
            if( node.getNodeType()!=Node.ELEMENT_NODE)
                continue;
            if( name != null &&
                name.equals( node.getNodeName() ) ) {
                return node;
            }
            if( name == null ) {
                return node;
            }
        }
        return null;
}

Get the first element child.

 public static Node getChild(Node parent,
    int type) 
{
        Node n=parent.getFirstChild();
        while( n!=null && type != n.getNodeType() ) {
            n=n.getNextSibling();
        }
        if( n==null ) return null;
        return n;
}

Get the first direct child with a given type

 public static String getChildContent(Node parent,
    String name) 
{
        Node first=parent.getFirstChild();
        if( first==null ) return null;
        for (Node node = first; node != null;
             node = node.getNextSibling()) {
            //System.out.println("getNode: " + name + " " + node.getNodeName());
            if( name.equals( node.getNodeName() ) ) {
                return getContent( node );
            }
        }
        return null;
}

Get the first child's content ( ie it's included TEXT node ).

 public static String getContent(Node n) 
{
    // -------------------- DOM utils --------------------
        if( n==null ) return null;
        Node n1=DomUtil.getChild(n, Node.TEXT_NODE);
        if( n1==null ) return null;
        String s1=n1.getNodeValue();
        return s1.trim();
}

Get the trimed text content of a node or null if there is no text

 public static Node getNext(Node current) 
{
        String name=current.getNodeName();
        int type=current.getNodeType();
        return getNext( current, name, type);
}

Get the next sibling with the same name and type

 public static Node getNext(Node current,
    String name,
    int type) 
{
        Node first=current.getNextSibling();
        if( first==null ) return null;
        for (Node node = first; node != null;
             node = node.getNextSibling()) {
            if( type  >= 0 && node.getNodeType() != type ) continue;
            //System.out.println("getNode: " + name + " " + node.getNodeName());
            if( name==null )
                return node;
            if( name.equals( node.getNodeName() ) ) {
                return node;
            }
        }
        return null;
}

Return the next sibling with a given name and type

 public static Document readXml(InputStream is) throws IOException, SAXException, ParserConfigurationException 
{
        DocumentBuilderFactory dbf =
            DocumentBuilderFactory.newInstance();
        dbf.setValidating(false);
        dbf.setIgnoringComments(false);
        dbf.setIgnoringElementContentWhitespace(true);
        //dbf.setCoalescing(true);
        //dbf.setExpandEntityReferences(true);
        DocumentBuilder db = null;
        db = dbf.newDocumentBuilder();
        db.setEntityResolver( new NullResolver() );
        // db.setErrorHandler( new MyErrorHandler());
        Document doc = db.parse(is);
        return doc;
}

Read XML as DOM.

 public static  void removeAttribute(Node node,
    String attName) 
{
        NamedNodeMap attributes=node.getAttributes();
        attributes.removeNamedItem(attName);
}

 public static  void setAttribute(Node node,
    String attName,
    String val) 
{
        NamedNodeMap attributes=node.getAttributes();
        Node attNode=node.getOwnerDocument().createAttribute(attName);
        attNode.setNodeValue( val );
        attributes.setNamedItem(attNode);
}

 public static  void setAttributes(Object o,
    Node parent) 
{
        NamedNodeMap attrs=parent.getAttributes();
        if( attrs==null ) return;
        for (int i=0; i< attrs.getLength(); i++ ) {
            Node n=attrs.item(i);
            String name=n.getNodeName();
            String value=n.getNodeValue();
            if( log.isTraceEnabled() )
                log.trace("Attribute " + parent.getNodeName() + " " +
                            name + "=" + value);
            try {
                IntrospectionUtils.setProperty(o, name, value);
            } catch( Exception ex ) {
                ex.printStackTrace();
            }
        }
}

 public static  void setText(Node node,
    String val) 
{
        Node chld=DomUtil.getChild(node, Node.TEXT_NODE);
        if( chld == null ) {
            Node textN=node.getOwnerDocument().createTextNode(val);
            node.appendChild(textN);
            return;
        }
        // change the value
        chld.setNodeValue(val);
}

Set or replace the text value

 public static  void writeXml(Node n,
    OutputStream os) throws TransformerException 
{
        TransformerFactory tf=TransformerFactory.newInstance();
        //identity
        Transformer t=tf.newTransformer();
        t.setOutputProperty(OutputKeys.INDENT, "yes");
        t.transform(new DOMSource( n ), new StreamResult( os ));
}