Code to generate an XML document from a portion of a DOM tree
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// xmlfromdom.java ||
// ||
// This code generates an XML document from a portion of a DOM tree. ||
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// Written 17 February 2000 by Doug Tidwell. ||
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// ||
// (C) Copyright IBM Corp. 1999, 2000. All rights reserved. ||
// ||
// US Government Users Restricted Rights Use, duplication or ||
// disclosure restricted by GSA ADP Schedule Contract with IBM Corp. ||
// ||
// The program is provided "as is" without any warranty express or ||
// implied, including the warranty of non-infringement and the implied ||
// warranties of merchantibility and fitness for a particular purpose. ||
// IBM will not be liable for any damages suffered by you as a result ||
// of using the Program. In no event will IBM be liable for any ||
// special, indirect or consequential damages or lost profits even if ||
// IBM has been advised of the possibility of their occurrence. IBM ||
// will not be liable for any third party claims against you. ||
// ||
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import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.w3c.dom.Attr;
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;
import org.apache.xerces.parsers.*;
public class xmlfromdom extends HttpServlet
{
Document doc = null;
Element author = null;
Element lines = null;
Element title = null;
public void initialize()
{
try
{
doc = (Document)Class.
forName("org.apache.xerces.dom.DocumentImpl").
newInstance();
}
catch (ClassNotFoundException cnfe)
{
System.err.println(cnfe);
}
catch (IllegalAccessException iae)
{
System.err.println(iae);
}
catch (InstantiationException ie)
{
System.err.println(ie);
}
if (doc != null)
{
Element root = doc.createElement("sonnet");
root.setAttribute("type", "Shakespearean");
author = doc.createElement("author");
Element lastName = doc.createElement("last-name");
lastName.appendChild(doc.createTextNode("Shakespeare"));
author.appendChild(lastName);
Element firstName = doc.createElement("first-name");
firstName.appendChild(doc.createTextNode("William"));
author.appendChild(firstName);
Element nationality = doc.createElement("nationality");
nationality.appendChild(doc.createTextNode("British"));
author.appendChild(nationality);
Element yearOfBirth = doc.createElement("year-of-birth");
yearOfBirth.appendChild(doc.createTextNode("1564"));
author.appendChild(yearOfBirth);
Element yearOfDeath = doc.createElement("year-of-death");
yearOfDeath.appendChild(doc.createTextNode("1616"));
author.appendChild(yearOfDeath);
root.appendChild(author);
title = doc.createElement("title");
title.appendChild(doc.createTextNode("Sonnet 130"));
root.appendChild(title);
lines = doc.createElement("lines");
Element line01 = doc.createElement("line");
line01.appendChild(doc.createTextNode("My mistress' eyes are nothing like the sun,"));
lines.appendChild(line01);
Element line02 = doc.createElement("line");
line02.appendChild(doc.createTextNode("Coral is far more red than her lips red."));
lines.appendChild(line02);
Element line03 = doc.createElement("line");
line03.appendChild(doc.createTextNode("If snow be white, why then her breasts are dun,"));
lines.appendChild(line03);
Element line04 = doc.createElement("line");
line04.appendChild(doc.createTextNode("If hairs be wires, black wires grow on her head."));
lines.appendChild(line04);
Element line05 = doc.createElement("line");
line05.appendChild(doc.createTextNode("I have seen roses damasked, red and white,"));
lines.appendChild(line05);
Element line06 = doc.createElement("line");
line06.appendChild(doc.createTextNode("But no such roses see I in her cheeks."));
lines.appendChild(line06);
Element line07 = doc.createElement("line");
line07.appendChild(doc.createTextNode("And in some perfumes is there more delight"));
lines.appendChild(line07);
Element line08 = doc.createElement("line");
line08.appendChild(doc.createTextNode("Than in the breath that from my mistress reeks."));
lines.appendChild(line08);
Element line09 = doc.createElement("line");
line09.appendChild(doc.createTextNode("I love to hear her speak, yet well I know"));
lines.appendChild(line09);
Element line10 = doc.createElement("line");
line10.appendChild(doc.createTextNode("That music hath a far more pleasing sound."));
lines.appendChild(line10);
Element line11 = doc.createElement("line");
line11.appendChild(doc.createTextNode("I grant I never saw a goddess go,"));
lines.appendChild(line11);
Element line12 = doc.createElement("line");
line12.appendChild(doc.createTextNode("My mistress when she walks, treads on the ground."));
lines.appendChild(line12);
Element line13 = doc.createElement("line");
line13.appendChild(doc.createTextNode("And yet, by Heaven, I think my love as rare"));
lines.appendChild(line13);
Element line14 = doc.createElement("line");
line14.appendChild(doc.createTextNode("As any she belied with false compare."));
lines.appendChild(line14);
root.appendChild(lines);
doc.appendChild(root);
}
}
/** Prints the specified node, recursively. */
public void printDOMTree(Node node, PrintWriter out)
{
int type = node.getNodeType();
switch (type)
{
// print the document element
case Node.DOCUMENT_NODE:
{
printDOMTree(((Document)node).getDocumentElement(), out);
break;
}
// print element with attributes
case Node.ELEMENT_NODE:
{
out.print("<");
out.print(node.getNodeName());
NamedNodeMap attrs = node.getAttributes();
for (int i = 0; i < attrs.getLength(); i++)
{
Node attr = attrs.item(i);
out.print(" " + attr.getNodeName() +
"=\"" + attr.getNodeValue() +
"\"");
}
out.print(">");
NodeList children = node.getChildNodes();
if (children != null)
{
int len = children.getLength();
for (int i = 0; i < len; i++)
printDOMTree(children.item(i), out);
}
break;
}
// handle entity reference nodes
case Node.ENTITY_REFERENCE_NODE:
{
out.print("&");
out.print(node.getNodeName());
out.print(";");
break;
}
// print cdata sections
case Node.CDATA_SECTION_NODE:
{
out.print("<![CDATA[");
out.print(node.getNodeValue());
out.print("]]>");
break;
}
// print text
case Node.TEXT_NODE:
{
out.print(node.getNodeValue());
break;
}
// print processing instruction
case Node.PROCESSING_INSTRUCTION_NODE:
{
out.print("<?");
out.print(node.getNodeName());
String data = node.getNodeValue();
{
out.print(" ");
out.print(data);
}
out.print("?>");
break;
}
}
if (type == Node.ELEMENT_NODE)
{
out.print("</");
out.print(node.getNodeName());
out.print('>');
}
} // printDOMTree(Node, PrintWriter)
public void service(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
if (doc == null)
initialize();
response.setContentType("text/xml");
PrintWriter out = response.getWriter();
Enumeration keys;
String key;
String requestedSubtree = "";
keys = request.getParameterNames();
while (keys.hasMoreElements())
{
key = (String) keys.nextElement();
if (key.equalsIgnoreCase("subtree"))
requestedSubtree = request.getParameter(key);
}
out.println("<?xml version=\"1.0\" ?>");
if (requestedSubtree.equalsIgnoreCase("author"))
printDOMTree(author, out);
else if (requestedSubtree.equalsIgnoreCase("lines"))
printDOMTree(lines, out);
else if (requestedSubtree.equalsIgnoreCase("title"))
printDOMTree(title, out);
else
printDOMTree(doc, out);
}
}
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