Get the content after make a change ?

[grayworld]

Here's my code :
After i used a NodeVisitor to modify the content , i have done as following to get the content and print to console or do something else . but it returned nothing ! can any body tell me why ?

My idea is to process a html file , change the "src" attributes of the <img> tag and return a String contains the document after modified .I just haven't known which is the easiest way to do it . Cound any one give me an advice ?

thanks in advance !

public class MyVisitor extends NodeVisitor
{
    public MyVisitor ()
    {
    }

    public void visitTag (Tag tag)
    {
         if (tag.getTagName().equals ("img") || tag.getTagName().equals ("IMG")){
             String imgPath = tag.getAttribute("src") ;
             imgPath = "something" + imgPath  ;
             tag.setAttribute("src" ,imgPath );
           
                                              
         }
     //   System.out.println ("\n" + tag.getTagName () + tag.getStartPosition ());
    }

    public void visitStringNode (Text string)
    {
      //   System.out.println (string);
    }

    public static void main (String[] args) throws ParserException
    {
        Parser parser = new Parser ("c:/index.html");
        NodeVisitor visitor = new MyVisitor ();
        parser.visitAllNodesWith (visitor);
       
        NodeList list = new NodeList ();       
        NodeIterator iterator =  parser.elements();
       
        while (iterator.hasMoreNodes ())
            list.add (iterator.nextNode()); // ok got the node list
       
       
        System.out.println("list :\n" + list.toHtml()) ; // print nothing !
       
    }
}

[grayworld]

Oh ,I got it .

I need to gather all the nodes first, then apply the filter and process it and then print out the full list:
NodeList all = parser.Parse (null);
Nodelist imgNodeList = all.extractAllNodesThatMatch (imgFilter);
// ... processing as above
System.out.println (all.toHtml ());

Thanks Derrick Oswald so much for the solution .