XML Schemas Definition Hands On

XML Schema Definition Theory

XML An Introduction

Create XML File in JAVA using DOM

package com.test;

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class CreateXMLInJava {

public static void main(String argv[]) {
        CreateXMLInJava createXml = new CreateXMLInJava();
        createXml.createXML();
}

public void createXML() {
    try {
         DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
         DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

        // root elements
        Document doc = docBuilder.newDocument();
        Element rootElement = doc.createElement(“Company”);
       doc.appendChild(rootElement);

       // staff elements
       Element staff = doc.createElement(“Dept”);
       rootElement.appendChild(staff);

       // set attribute to staff element
       Attr attr = doc.createAttribute(“id”);
       attr.setValue(“1″);
       staff.setAttributeNode(attr);

       // can be written as
       // staff.setAttribute(“id”, “1″);

       // firstname elements
      Element firstname = doc.createElement(“Firstname”);
       firstname.appendChild(doc.createTextNode(“mallik”));
       staff.appendChild(firstname);

      // lastname elements
      Element lastname = doc.createElement(“Lastname”);
      lastname.appendChild(doc.createTextNode(“Gunda”));
      staff.appendChild(lastname);

        // salary elements
      Element salary = doc.createElement(“Salary”);
      salary.appendChild(doc.createTextNode(“100000″));
      staff.appendChild(salary);

      // write the content into xml file
      TransformerFactory transformerFactory = TransformerFactory.newInstance();
      Transformer transformer = transformerFactory.newTransformer();
      DOMSource source = new DOMSource(doc);
      StreamResult result = new StreamResult(new File(“D:\\test.xml”));

     // Output to console for testing
     // StreamResult result = new StreamResult(System.out);

       transformer.transform(source, result);

      System.out.println(“File saved!”);

   } catch (ParserConfigurationException pce) {
       pce.printStackTrace();
  } catch (TransformerException tfe) {
    tfe.printStackTrace();
  }
 }
}

XML Parsing Example using DOM in Java

package com.test;


import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.CharacterData;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
public class XMLParsing {
  public static void main(String arg[]) throws Exception{

          String xmlRecords = "<data><employee><name>A</name>"
        + "<title>Manager</title></employee></data>";


    DocumentBuilder db = DocumentBuilderFactory.newInstance().
newDocumentBuilder();
    InputSource is = new InputSource();
    is.setCharacterStream(new StringReader(xmlRecords));


    Document doc = db.parse(is);
    NodeList nodes = doc.getElementsByTagName("employee");


    for (int i = 0; i < nodes.getLength(); i++) {
      Element element = (Element) nodes.item(i);


      NodeList name = element.getElementsByTagName("name");
      Element line = (Element) name.item(0);
      System.out.println("Name: " + getCharacterDataFromElement(line));


      NodeList title = element.getElementsByTagName("title");
      line = (Element) title.item(0);
      System.out.println("Title: " + getCharacterDataFromElement(line));
    }
  }
  public static String getCharacterDataFromElement(Element e) {
    Node child = e.getFirstChild();
    if (child instanceof CharacterData) {
      CharacterData cd = (CharacterData) child;
      return cd.getData();
    }
    return "";
  }
}




Related Links:
                   XML Parsing using SAX Parser in Java
           Read Properties File in java
                   J2EE Design Patterns