DOM方式保存xml为UTF-8格式

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();
		}
	}

}