import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;

public class DomTest {
    private static Document document;

    public static void main(String[] args)
            throws ParserConfigurationException, SAXException, IOException {
        // 引数で XML を指定
        String xmlUri = args[0];

        // XML ファイルをパースして Document オブジェクトを取得
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        document = builder.parse(xmlUri);

        // ルート要素を取得
        Element root = document.getDocumentElement();
        System.out.println("NodeName of root element: " + root.getNodeName());
    }
}