Java XML Tutorial - Java DOM Edit

Attribute

The following code shows how to add attribute to an element.

import java.io.StringWriter;
/*www.java2s.com*/
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class Main {
 public static void main(String[] argv) throws Exception {
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 DocumentBuilder builder = factory.newDocumentBuilder();
 DOMImplementation impl = builder.getDOMImplementation();
 Document doc = impl.createDocument(null, null, null);
 Element e1 = doc.createElement("api");
 doc.appendChild(e1);
 Element e2 = doc.createElement("java");
 e1.appendChild(e2);
 e2.setAttribute("url", "http://www.java2s.com");
 //transform the DOM for showing the result in console
 DOMSource domSource = new DOMSource(doc);
 Transformer transformer = TransformerFactory.newInstance().newTransformer();
 transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
 transformer.setOutputProperty(OutputKeys.METHOD, "xml");
 transformer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1");
 transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 StringWriter sw = new StringWriter();
 StreamResult sr = new StreamResult(sw);
 transformer.transform(domSource, sr);
 System.out.println(sw.toString());
 }
}

The code above generates the following result.

Copying Attributes

 public void dupAttributes(Document doc) {
 Element root = doc.getDocumentElement();
 Element personOne = (Element)root.getFirstChild();
 Element personTwo = (Element)personOne.getNextSibling();
 Element personThree = (Element)personTwo.getNextSibling();
 Attr deptAttr = personOne.getAttributeNode("dept");
 personOne.removeAttributeNode(deptAttr);
 String deptString = deptAttr.getValue();
 personTwo.setAttribute("dept",deptString);
 personThree.setAttribute("dept",deptString);
 String mailString = personOne.getAttribute("mail");
 personTwo.setAttribute("mail",mailString);
 String titleString = personOne.getAttribute("title");
 personOne.removeAttribute("title");
 personThree.setAttribute("title",titleString);
 }

Deleting Two Attributes

 public void delAttribute(Document doc) {
 Element root = doc.getDocumentElement();
 Element person = (Element)root.getFirstChild();
 person.removeAttribute("extension");
 person.removeAttribute("dept");
 }

Element

import java.io.StringWriter;
/*www.java2s.com*/
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
public class Main {
 public static void main(String[] argv) throws Exception {
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 DocumentBuilder builder = factory.newDocumentBuilder();
 DOMImplementation impl = builder.getDOMImplementation();
 Document doc = impl.createDocument(null, null, null);
 Node root = doc.createElement("A");
 doc.appendChild(root);
 Node stanza = doc.createElement("B");
 root.appendChild(stanza);
 Node line = doc.createElement("C");
 stanza.appendChild(line);
 line.appendChild(doc.createTextNode("test"));
 line = doc.createElement("Line");
 stanza.appendChild(line);
 line.appendChild(doc.createTextNode("test"));
 //transform the DOM for showing the result in console
 DOMSource domSource = new DOMSource(doc);
 Transformer transformer = TransformerFactory.newInstance().newTransformer();
 transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
 transformer.setOutputProperty(OutputKeys.METHOD, "xml");
 transformer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1");
 transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 StringWriter sw = new StringWriter();
 StreamResult sr = new StreamResult(sw);
 transformer.transform(domSource, sr);
 System.out.println(sw.toString());
 }
}

The code above generates the following result.

The following code shows how to remove an element from parent.

 public void deleteFirstElement(Document doc) {
 Element root = doc.getDocumentElement();
 Element child = (Element)root.getFirstChild();
 root.removeChild(child);
 }

Text Node

The following code shows how to add text node to an element.

import java.io.StringWriter;
//fromwww.java2s.com
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;
public class Main {
 public static void main(String[] argv) throws Exception {
 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
 dbf.setNamespaceAware(true);
 DocumentBuilder db = dbf.newDocumentBuilder();
 Document doc = db.newDocument();
 Element root = doc.createElementNS(null, "person"); // Create Root Element
 Element item = doc.createElementNS(null, "name"); // Create element
 item.appendChild(doc.createTextNode("Jeff"));
 root.appendChild(item); // Attach element to Root element
 item = doc.createElementNS(null, "age"); // Create another Element
 item.appendChild(doc.createTextNode("28"));
 root.appendChild(item); // Attach Element to previous element down tree
 item = doc.createElementNS(null, "height");
 item.appendChild(doc.createTextNode("1.80"));
 root.appendChild(item); // Attach another Element - grandaugther
 doc.appendChild(root); // Add Root to Document

 DOMImplementationRegistry registry = DOMImplementationRegistry
 .newInstance();
 DOMImplementationLS domImplLS = (DOMImplementationLS) registry
 .getDOMImplementation("LS");
 LSSerializer ser = domImplLS.createLSSerializer(); // Create a serializer
 // for the DOM
 LSOutput out = domImplLS.createLSOutput();
 StringWriter stringOut = new StringWriter(); // Writer will be a String
 out.setCharacterStream(stringOut);
 ser.write(doc, out); // Serialize the DOM

 System.out.println("STRXML = " + stringOut.toString()); // DOM as a String
 }
}

The code above generates the following result.

The following code shows how to edit text by insertion and replacement.

 public void edit3(Document doc) {
 int count;
 int offset;
 Element root = doc.getDocumentElement();
 Element place = (Element)root.getFirstChild();
 Text name = (Text)place.getFirstChild().getFirstChild();
 Text directions = (Text)place.getLastChild().getFirstChild();
 offset = 7;
 name.insertData(offset," black");
 offset = 5;
 count = 4;
 directions.replaceData(offset,count,"right");
 }

Modifying Text by Cutting and Pasting

 public void edit(Document doc) {
 int length;
 int count;
 int offset;
 Element root = doc.getDocumentElement();
 Element place = (Element)root.getFirstChild();
 Text name = (Text)place.getFirstChild().getFirstChild();
 Text directions = (Text)place.getLastChild().getFirstChild();
 length = name.getLength();
 count = 4;
 offset = length - 4;
 name.deleteData(offset,count);
 length = directions.getLength();
 count = 6;
 offset = length - count;
 String bridge = directions.substringData(offset,count);
 name.appendData(bridge);
 count = 5;
 offset = 4;
 directions.deleteData(offset,count);
 }

Modifying Text by Replacement

 public void edit(Document doc) {
 Element root = doc.getDocumentElement();
 Element place = (Element)root.getFirstChild();
 Text name = (Text)place.getFirstChild().getFirstChild();
 Text directions = (Text)place.getLastChild().getFirstChild();
 name.setData("AAA");
 directions.setData("BBB");
 }

Comment

The following code shows how to create comments node for XML.

import java.io.File;
/*fromwww.java2s.com*/
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class Main {
 public static void main(String[] argv) throws Exception {
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 factory.setValidating(true);
 factory.setExpandEntityReferences(false);
 Document doc = factory.newDocumentBuilder().parse(new File("filename"));
 Element element = doc.getDocumentElement();
 Comment comment = doc.createComment("A Document Comment");
 element.getParentNode().insertBefore(comment, element);
 }
}

Processing Instruction

The following code shows how to add ProcessingInstruction.

 public void addProcessingInstruction(Document doc) {
 Element root = doc.getDocumentElement();
 Element folks = (Element)root.getLastChild();
 ProcessingInstruction pi;
 pi = (ProcessingInstruction)doc.createProcessingInstruction(
 "validate",
 "phone=\"lookup\"");
 root.insertBefore(pi,folks);
 }

CDATA

The following code shows how to add CDATA to XML document.

 public void addCDATA(Document doc) {
 Element root = doc.getDocumentElement();
 Element place = (Element)root.getFirstChild();
 Element directions = (Element)place.getLastChild();
 String dirtext =/*fromwww.java2s.com*/
 ">>>\n" +
 "<<<\n" +
 "&&&\n" +
 "<><><>.";
 CDATASection dirdata = doc.createCDATASection(dirtext);
 directions.replaceChild(dirdata,directions.getFirstChild());
 }

Clone

 public void duplicatePerson(Document doc) {
 Element root = doc.getDocumentElement();
 Element origPerson = (Element)root.getFirstChild();
 Element newPerson = (Element)origPerson.cloneNode(true);
 root.appendChild(newPerson);
 }