634 - JAXP - DOM - 属性の追加

package xml.dom;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
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.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class test {
    public static void main(String[] args){
        try{
            // ドキュメントビルダーの作成
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = dbFactory.newDocumentBuilder();

            // ドキュメントの作成
            DOMImplementation domImpl = builder.getDOMImplementation();
            Document doc = domImpl.createDocument("", "root", null);

            // ルートノードの参照を取得
            Element root = doc.getDocumentElement();
            root.setAttribute("No", "0001");

            // ファイルとして出力（検証用）
            TransformerFactory transFactory = TransformerFactory.newInstance();
            Transformer transformer = transFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            FileOutputStream os = new FileOutputStream(new File("file.xml"));
            StreamResult result = new StreamResult(os);
            transformer.transform(source, result);

        }catch(FileNotFoundException e){
            e.printStackTrace();
        }catch(ParserConfigurationException e){
            e.printStackTrace();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<root No="0001"/>