Create and writing xml file

Question

Hi all.
I'm starting to learn Java. In my project, I have a class data structure, and I want to save its information into xml file for record. But I'm not sure how to do..
Does java provide easier interface to construct an XML file ? or I need to use OutputStream ?
Can anyone give me some examples or teach me how to do?
many thanks

Answer 1

Hi,
The code you have written looks great and nothing really needs to be changed. I will offer a couple of comments though.
The first is that there is an easier API for adding attributes that you might wish to use. The following:
rootElement.setAttribute(Tag_Version, "3");Is equivalent to:
Attr atr = document.createAttribute(Tag_Version);
atr.setValue("3");
rootElement.setAttributeNode(atr);Also whenever possible I prefer to use standard APIs rather than proprietary ones. I took your code and rewrote it using JAXP APIs, more code is required since JAXP does not offer the same convenience as the XDK but multiple parsers support the JAXP standard (including the XDK) and this makes your code portable across different parser implementations.
import java.io.FileOutputStream;
import java.io.OutputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
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.Document;
import org.w3c.dom.Element;
public class Example {
    private static String Tag_Main = "main";
    private static String Tag_Version = "version";
    private static String Tag_SetupName = "setup-name";
    private static String Tag_Remarks = "remarks";
    public static void main(String[] args) throws Exception {
        OutputStream outStream = new FileOutputStream("abc.xml");
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
        Document document = documentBuilder.newDocument();
        Element rootElement = document.createElement(Tag_Main);
        rootElement.setAttribute(Tag_Version, "3");
        document.appendChild(rootElement);
        Element em = document.createElement(Tag_SetupName);
        em.appendChild(document.createTextNode("Setup 1"));
        rootElement.appendChild(em);
        em = document.createElement(Tag_Remarks);
        em.appendChild(document.createTextNode("My Testing"));
        rootElement.appendChild(em);
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        DOMSource source = new DOMSource(document);
        StreamResult result = new StreamResult(outStream);
        transformer.transform(source, result);
        outStream.flush();
        outStream.close();
}-Blaise