Java tutorial
//Example XML document /* An XML Document Containing a Simple Contact List Start example <?xml version="1.0" standalone="yes"?> <folks> <person> <phone>306 555-9999</phone> <email>joe@webserver.net</email> <name>Wang, Joe</name> </person> <person> <phone>704 555-0000</phone> <name>Pet, Rob</name> <email>rob@server.com</email> </person> </folks> */ import java.io.IOException; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.Attr; import org.w3c.dom.CDATASection; import org.w3c.dom.Comment; import org.w3c.dom.Document; import org.w3c.dom.DocumentFragment; import org.w3c.dom.DocumentType; import org.w3c.dom.Element; import org.w3c.dom.Entity; import org.w3c.dom.EntityReference; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.w3c.dom.Notation; 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 TreeDumper2 { public void dump(Document doc) { dumpLoop((Node) doc, ""); } private void dumpLoop(Node node, String indent) { switch (node.getNodeType()) { case Node.ATTRIBUTE_NODE: dumpAttributeNode((Attr) node, indent); break; case Node.CDATA_SECTION_NODE: dumpCDATASectionNode((CDATASection) node, indent); break; case Node.COMMENT_NODE: dumpCommentNode((Comment) node, indent); break; case Node.DOCUMENT_NODE: dumpDocument((Document) node, indent); break; case Node.DOCUMENT_FRAGMENT_NODE: dumpDocumentFragment((DocumentFragment) node, indent); break; case Node.DOCUMENT_TYPE_NODE: dumpDocumentType((DocumentType) node, indent); break; case Node.ELEMENT_NODE: dumpElement((Element) node, indent); break; case Node.ENTITY_NODE: dumpEntityNode((Entity) node, indent); break; case Node.ENTITY_REFERENCE_NODE: dumpEntityReferenceNode((EntityReference) node, indent); break; case Node.NOTATION_NODE: dumpNotationNode((Notation) node, indent); break; case Node.PROCESSING_INSTRUCTION_NODE: dumpProcessingInstructionNode((ProcessingInstruction) node, indent); break; case Node.TEXT_NODE: dumpTextNode((Text) node, indent); 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 + " "); } /* Display the contents of a ATTRIBUTE_NODE */ private void dumpAttributeNode(Attr node, String indent) { System.out.println(indent + "ATTRIBUTE " + node.getName() + "=\"" + node.getValue() + "\""); } /* Display the contents of a CDATA_SECTION_NODE */ private void dumpCDATASectionNode(CDATASection node, String indent) { System.out.println(indent + "CDATA SECTION length=" + node.getLength()); System.out.println(indent + "\"" + node.getData() + "\""); } /* Display the contents of a COMMENT_NODE */ private void dumpCommentNode(Comment node, String indent) { System.out.println(indent + "COMMENT length=" + node.getLength()); System.out.println(indent + " " + node.getData()); } /* Display the contents of a DOCUMENT_NODE */ private void dumpDocument(Document node, String indent) { System.out.println(indent + "DOCUMENT"); } /* Display the contents of a DOCUMENT_FRAGMENT_NODE */ private void dumpDocumentFragment(DocumentFragment node, String indent) { System.out.println(indent + "DOCUMENT FRAGMENT"); } /* Display the contents of a DOCUMENT_TYPE_NODE */ private void dumpDocumentType(DocumentType node, String indent) { System.out.println(indent + "DOCUMENT_TYPE: " + node.getName()); if (node.getPublicId() != null) System.out.println(indent + " Public ID: " + node.getPublicId()); if (node.getSystemId() != null) System.out.println(indent + " System ID: " + node.getSystemId()); NamedNodeMap entities = node.getEntities(); if (entities.getLength() > 0) { for (int i = 0; i < entities.getLength(); i++) { dumpLoop(entities.item(i), indent + " "); } } NamedNodeMap notations = node.getNotations(); if (notations.getLength() > 0) { for (int i = 0; i < notations.getLength(); i++) dumpLoop(notations.item(i), indent + " "); } } /* Display the contents of a ELEMENT_NODE */ private void dumpElement(Element node, String indent) { System.out.println(indent + "ELEMENT: " + node.getTagName()); NamedNodeMap nm = node.getAttributes(); for (int i = 0; i < nm.getLength(); i++) dumpLoop(nm.item(i), indent + " "); } /* Display the contents of a ENTITY_NODE */ private void dumpEntityNode(Entity node, String indent) { System.out.println(indent + "ENTITY: " + node.getNodeName()); } /* Display the contents of a ENTITY_REFERENCE_NODE */ private void dumpEntityReferenceNode(EntityReference node, String indent) { System.out.println(indent + "ENTITY REFERENCE: " + node.getNodeName()); } /* Display the contents of a NOTATION_NODE */ private void dumpNotationNode(Notation node, String indent) { System.out.println(indent + "NOTATION"); System.out.print(indent + " " + node.getNodeName() + "="); if (node.getPublicId() != null) System.out.println(node.getPublicId()); else System.out.println(node.getSystemId()); } /* Display the contents of a PROCESSING_INSTRUCTION_NODE */ private void dumpProcessingInstructionNode(ProcessingInstruction node, String indent) { System.out.println(indent + "PI: target=" + node.getTarget()); System.out.println(indent + " " + node.getData()); } /* Display the contents of a TEXT_NODE */ private void dumpTextNode(Text node, String indent) { System.out.println(indent + "TEXT length=" + node.getLength()); System.out.println(indent + " " + node.getData()); } static public void main(String[] arg) { String filename = null; boolean validate = false; if (arg.length == 1) { filename = arg[0]; } else if (arg.length == 2) { if (!arg[0].equals("-v")) usage(); validate = true; filename = arg[1]; } else { usage(); } 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(); builder.setErrorHandler(new MyErrorHandler()); InputSource is = new InputSource(filename); 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); } // Use a TreeDumper to list the tree TreeDumper2 td = new TreeDumper2(); td.dump(doc); } private static void usage() { System.err.println("Usage: DOMCheck [-v] <filename>"); System.exit(1); } } 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()); } }