Java HTML / XML How to - Dump DOM node

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Question

We would like to know how to dump DOM node.

Answer

/*  w ww.  j  av a2  s  . c  o  m*/

import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class Main {
  public static String getXMLData(){
    return "<x></x>";
  }
  static public void main(String[] arg) {
    boolean validate = true;

    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    dbf.setValidating(validate);
    dbf.setNamespaceAware(true);
    dbf.setIgnoringElementContentWhitespace(true);

    // Parse the input to produce a parse tree with its root
    // in the form of a Document object
    Document doc = null;
    try {
      DocumentBuilder builder = dbf.newDocumentBuilder();
      InputSource is = new InputSource(new StringReader(getXMLData()));
      doc = builder.parse(is);
    } catch (SAXException e) {
      System.exit(1);
    } catch (ParserConfigurationException e) {
      System.err.println(e);
      System.exit(1);
    } catch (IOException e) {
      System.err.println(e);
      System.exit(1);
    }
    dump(doc);
  }

  private static void dump(Document doc) {
    dumpLoop((Node) doc, "");
  }

  private static void dumpLoop(Node node, String indent) {
    switch (node.getNodeType()) {
    case Node.CDATA_SECTION_NODE:
      System.out.println(indent + "CDATA_SECTION_NODE");
      break;
    case Node.COMMENT_NODE:
      System.out.println(indent + "COMMENT_NODE");
      break;
    case Node.DOCUMENT_FRAGMENT_NODE:
      System.out.println(indent + "DOCUMENT_FRAGMENT_NODE");
      break;
    case Node.DOCUMENT_NODE:
      System.out.println(indent + "DOCUMENT_NODE");
      break;
    case Node.DOCUMENT_TYPE_NODE:
      System.out.println(indent + "DOCUMENT_TYPE_NODE");
      break;
    case Node.ELEMENT_NODE:
      System.out.println(indent + "ELEMENT_NODE");
      break;
    case Node.ENTITY_NODE:
      System.out.println(indent + "ENTITY_NODE");
      break;
    case Node.ENTITY_REFERENCE_NODE:
      System.out.println(indent + "ENTITY_REFERENCE_NODE");
      break;
    case Node.NOTATION_NODE:
      System.out.println(indent + "NOTATION_NODE");
      break;
    case Node.PROCESSING_INSTRUCTION_NODE:
      System.out.println(indent + "PROCESSING_INSTRUCTION_NODE");
      break;
    case Node.TEXT_NODE:
      System.out.print(indent + "TEXT_NODE");
      System.out.println(" : "+node.getTextContent());
      break;
    default:
      System.out.println(indent + "Unknown node");
      break;
    }

    NodeList list = node.getChildNodes();
    for (int i = 0; i < list.getLength(); i++){
      dumpLoop(list.item(i), indent + "   ");
    }
  }
}

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