public class DOMTest {
private String outFile = "c:\abc\people.xml";

public static void main(String[] args) {
    new DOMTest();

}

public DOMTest() {
    try {
        File file = new File(outFile); 
        if(!file.exists()){
            file.createNewFile();
        }

        javax.xml.parsers.DocumentBuilder builder = javax.xml.parsers.DocumentBuilderFactory.newInstance()
                .newDocumentBuilder();
        org.w3c.dom.Document doc = builder.newDocument();
        org.w3c.dom.Element root = doc.createElement("老师");
        org.w3c.dom.Element wang = doc.createElement("苍");
        org.w3c.dom.Element liu = doc.createElement("刘");

        wang.appendChild(doc.createTextNode("我是苍老师"));
        root.appendChild(wang);
        root.appendChild(liu);
        doc.appendChild(root);

        javax.xml.transform.Transformer transformer = javax.xml.transform.TransformerFactory.newInstance()
                .newTransformer();
        transformer.setOutputProperty(javax.xml.transform.OutputKeys.ENCODING,"gb2312");
        transformer.setOutputProperty(javax.xml.transform.OutputKeys.INDENT,"yes");
        transformer.transform(new javax.xml.transform.dom.DOMSource(doc),new javax.xml.transform.stream.StreamResult(outFile));
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
}

}