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A Configuration utility that provides simple, flexible and powerful functionality for managing one or more configurations in a java environment. It uses a combination of a hierarchy of configuration files, substitution variables and property variables.

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package org.igfay.util;

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

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class PrettyPrinter {
    public static void printDoc(String url) throws ParserConfigurationException {
        System.out.println("Pretty printing XML file: " + url + ".");
        // Creating a parser factory (JAXP)
        // It can be configured at runtime, which implementation
        // (Xerces, Crimson, ...) is to be used,
        // for example via the Java systems property.
        DocumentBuilderFactory parserFactory = DocumentBuilderFactory.newInstance();
        // Configuring the parsers that the factory will create (JAXP)
        parserFactory.setValidating(true);
        parserFactory.setNamespaceAware(true);
        parserFactory.setExpandEntityReferences(true);
        // Creating a parser (JAXP)
        DocumentBuilder parser = parserFactory.newDocumentBuilder();
        try {
            // Using the parser to build the DOM document (JAXP)
            Document doc = parser.parse(url);
            // All further computations are based on DOM, no longer on JAXP.
            printNode(doc); // print nodes recursively
        } catch (Exception e) {
            System.out.println("Error in parsing: " + e.getMessage());
        }
    };

    public static void printNode(Node node) {
        // This method uses only DOM functionality.
        switch (node.getNodeType()) {
        case Node.DOCUMENT_NODE:
            System.out.println("");
            Document doc = (Document) node;
            printNode(doc.getDocumentElement());
            break;
        case Node.ELEMENT_NODE:
            Element element = (Element) node;
            element.normalize();
            String name = node.getNodeName();
            System.out.print("<" + name);
            NamedNodeMap attributes = node.getAttributes();
            for (int i = 0; i < attributes.getLength(); i++) {
                Node attr = attributes.item(i);
                System.out.print(" " + attr.getNodeName() + "=\"" + attr.getNodeValue() + "\"");
            }
            ;
            System.out.println(">");
            NodeList children = node.getChildNodes();
            if (children != null) {
                for (int i = 0; i < children.getLength(); i++) {
                    printNode(children.item(i));
                }
                ;
            }
            ;
            System.out.println("");
            break;
        case Node.TEXT_NODE:
        case Node.CDATA_SECTION_NODE:
            System.out.println(node.getNodeValue() + ""); // needs filtering!
            break;
        case Node.PROCESSING_INSTRUCTION_NODE:
            break;
        case Node.ENTITY_REFERENCE_NODE:
            System.out.println("&" + node.getNodeName() + ";");
            break;
        case Node.DOCUMENT_TYPE_NODE:
            break;
        }
        ;
    };

    public static void main(String[] args) {
        if (args.length != 1) {
            System.out.println("Usage: java PrettyPrinter [XML URL]");
            System.exit(0);
        }
        ;

        String url = args[0];

        try {
            PrettyPrinter.printDoc(url);
        } catch (ParserConfigurationException e) {
            System.out.println("Pretty printer failed due to parser" + "configuration error.");
            System.exit(0);
        }
    };
}