how to read and write an xml file using java

Hi Friend,

Try the following code:

1) CreateCDATA.java:

import java.io.*;
import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

public class CreateCDATA {
    public static void main(String[] args) {
        String xml =
                "<root>" +
                "   <messages>" +
                "       <message></message>" +
                "   </messages>" +
                "</root>";

        SAXBuilder builder = new SAXBuilder();
        try {
            Document document = builder.build(new StringReader(xml));
            Element root = document.getRootElement();
            Element comments = root.getChild("messages");

            Element comment = comments.getChild("message");
            comment.setContent(new CDATA("Hello World"));
            Writer writer=new FileWriter(new File("new.xml"));
            XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
            outputter.output(document, writer);
            } 
            catch (Exception e) {
            e.printStackTrace();
        }
    }
}

2)ReadCDATA.java:

import java.io.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;

public class ReadCDATA {
  public static void main(String[] args) throws Exception {
    File file = new File("new.xml");
    DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
    Document doc = builder.parse(file);

    NodeList nodes = doc.getElementsByTagName("messages");
    for (int i = 0; i < nodes.getLength(); i++) {
      Element element = (Element) nodes.item(i);
      NodeList title = element.getElementsByTagName("message");
      Element line = (Element) title.item(0);
      System.out.println("Message: " + getCharacterDataFromElement(line));
        }
  }
  public static String getCharacterDataFromElement(Element e) {
    Node child = e.getFirstChild();
    if (child instanceof CharacterData) {
      CharacterData cd = (CharacterData) child;
      return cd.getData();
    }
    return "";
  }
}

Thanks

how to read a xml file(login file with username and password)verify it and if it is correct pass the control to home page.