Java tutorial
import java.io.IOException; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Attr; import org.w3c.dom.CDATASection; import org.w3c.dom.Comment; import org.w3c.dom.Document; import org.w3c.dom.DocumentType; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.w3c.dom.ProcessingInstruction; import org.w3c.dom.Text; import org.xml.sax.ErrorHandler; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; public class DOMEdit { static public void main(String[] arg) { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setValidating(true); dbf.setNamespaceAware(true); dbf.setIgnoringElementContentWhitespace(true); Document doc = null; try { DocumentBuilder builder = dbf.newDocumentBuilder(); builder.setErrorHandler(new MyErrorHandler()); InputSource is = new InputSource("personWithDTD.xml"); doc = builder.parse(is); dupAttributes(doc); write(doc); } catch (Exception e) { System.err.println(e); } } public static void dupAttributes(Document doc) { Element root = doc.getDocumentElement(); Element personOne = (Element) root.getFirstChild(); Attr deptAttr = personOne.getAttributeNode("dept"); personOne.removeAttributeNode(deptAttr); String deptString = deptAttr.getValue(); personOne.setAttribute("dept", deptString + " updated"); String mailString = personOne.getAttribute("mail"); personOne.setAttribute("mail", mailString + " updated"); String titleString = personOne.getAttribute("title"); //personOne.removeAttribute("title"); personOne.setAttribute("title", titleString + " updated"); } private static final String TAB = " "; private static void write(Document doc) throws IOException { outputHeading(doc); outputElement(doc.getDocumentElement(), ""); } private static void outputHeading(Document doc) { System.out.print("<?xml version=\"1.0\""); DocumentType doctype = doc.getDoctype(); if (doctype != null) { if ((doctype.getPublicId() == null) && (doctype.getSystemId() == null)) { System.out.println(" standalone=\"yes\"?>"); } else { System.out.println(" standalone=\"no\"?>"); } } else { System.out.println("?>"); } } private static void outputElement(Element node, String indent) { System.out.print(indent + "<" + node.getTagName()); NamedNodeMap nm = node.getAttributes(); for (int i = 0; i < nm.getLength(); i++) { Attr attr = (Attr) nm.item(i); System.out.print(" " + attr.getName() + "=\"" + attr.getValue() + "\""); } System.out.println(">"); NodeList list = node.getChildNodes(); for (int i = 0; i < list.getLength(); i++) outputloop(list.item(i), indent + TAB); System.out.println(indent + "</" + node.getTagName() + ">"); } private static void outputText(Text node, String indent) { System.out.println(indent + node.getData()); } private static void outputCDATASection(CDATASection node, String indent) { System.out.println(indent + node.getData()); } private static void outputComment(Comment node, String indent) { System.out.println(indent + "<!-- " + node.getData() + " -->"); } private static void outputProcessingInstructionNode(ProcessingInstruction node, String indent) { System.out.println(indent + "<?" + node.getTarget() + " " + node.getData() + "?>"); } private static void outputloop(Node node, String indent) { switch (node.getNodeType()) { case Node.ELEMENT_NODE: outputElement((Element) node, indent); break; case Node.TEXT_NODE: outputText((Text) node, indent); break; case Node.CDATA_SECTION_NODE: outputCDATASection((CDATASection) node, indent); break; case Node.COMMENT_NODE: outputComment((Comment) node, indent); break; case Node.PROCESSING_INSTRUCTION_NODE: outputProcessingInstructionNode((ProcessingInstruction) node, indent); break; default: System.out.println("Unknown node type: " + node.getNodeType()); break; } } } class MyErrorHandler implements ErrorHandler { public void warning(SAXParseException e) throws SAXException { show("Warning", e); throw (e); } public void error(SAXParseException e) throws SAXException { show("Error", e); throw (e); } public void fatalError(SAXParseException e) throws SAXException { show("Fatal Error", e); throw (e); } private void show(String type, SAXParseException e) { System.out.println(type + ": " + e.getMessage()); System.out.println("Line " + e.getLineNumber() + " Column " + e.getColumnNumber()); System.out.println("System ID: " + e.getSystemId()); } } //File: personDTD.xml <?xml version="1.0"standalone="yes"?> <!-- This document is both well formed and valid--> <!DOCTYPE folks[<!ELEMENT folks (person)*> <!ELEMENT person (name, phone, email)> <!ELEMENT name (#PCDATA)> <!ELEMENT phone (#PCDATA)> <!ELEMENT email (#PCDATA)> <!ATTLIST person number CDATA #IMPLIED dept CDATA #IMPLIED mail CDATA #IMPLIED title CDATA #IMPLIED> ]> <folks> <person number="3412" dept="medical" mail="mailValue" title="titleValue"> <name>B D</name> <phone>999 555-8888</phone> <email>b@xyz.net</email> </person> </folks>