Java で XML 読み書き

よく忘れてしまいます。今一度、メモ。

import java.io.BufferedOutputStream;
import java.io.File;
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;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Sample {

	public static void main(String[] args) throws Exception {
		Element rootElement = null;
		{
			// read xml
			final DocumentBuilder builder = DocumentBuilderFactory
					.newInstance().newDocumentBuilder();
			final Document document = builder.parse(new File("./build.xml"));
			rootElement = document.getDocumentElement();
		}

		final NodeList nodeList = rootElement.getChildNodes();
		for (int index = 0; index < nodeList.getLength(); index++) {
			final Node look = nodeList.item(index);
			System.out.println(look.toString());
		}

		{
			// write xml
			final Transformer transformer = TransformerFactory.newInstance()
					.newTransformer();
			final DOMSource source = new DOMSource(rootElement);
			final OutputStream outStream = new BufferedOutputStream(
					new FileOutputStream(new File("./build-test.xml")));
			final StreamResult target = new StreamResult(outStream);
			transformer.transform(source, target);
		}
	}
}