代码如下：

import java.io.FileOutputStream;import java.util.Properties;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.OutputKeys;import javax.xml.transform.Result;import javax.xml.transform.Source;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 Test {	public static void main(String[] args) {		String path = "D:/demo.xml";		try {			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 			DocumentBuilder builder = factory.newDocumentBuilder(); 			Document document = builder.newDocument();						Element root = document.createElement("subject"); 			root.setAttribute("version", "2.3");			root.setAttribute("type", "0");			document.appendChild(root); 						Element options = document.createElement("options"); 			Element option_lockdbtable = document.createElement("option"); 			option_lockdbtable.setAttribute("name", "lockdbtable");			option_lockdbtable.setAttribute("value", "中文测试");			options.appendChild(option_lockdbtable); 			root.appendChild(options); 						Transformer tf = TransformerFactory.newInstance().newTransformer();		    Properties properties = tf.getOutputProperties();			properties.setProperty(OutputKeys.ENCODING, "UTF-8");//设置编码方式		    properties.setProperty(OutputKeys.INDENT, "yes");		    tf.setOutputProperties(properties);		    		    /* 	以下这种方式设置无效：		     *  Transformer transformer = tf.newTransformer();			 *	transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); 			 *	transformer.setOutputProperty(OutputKeys.INDENT, "yes");		     */		    		    Source xmlSource = new DOMSource(document);		    Result result = new StreamResult(new FileOutputStream(path));		    tf.transform(xmlSource, result);		} catch (Exception e) {			e.printStackTrace();		}	}}