Java写Xml文件中文乱码问题

Java写Xml文件中文乱码的问题不仅仅是设置Encoding那么简单，请看如下实例：

import java.io.File; 
import java.io.FileOutputStream; 
import java.io.OutputStreamWriter; 
import java.io.Writer;  
 
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.TransformerConfigurationException; 
import javax.xml.transform.TransformerException; 
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; 
import org.w3c.dom.Text; 
 
public class WriteXml { 
    private void writeXMLFile(String xmlfile) { 
        File file = new File("E:/tryfile/xml"); 
        file.listFiles(); 
        if(!file.exists()) {              
            file.mkdirs(); 
        } 
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
        DocumentBuilder dbuilder = null; 
        try { 
            dbuilder = dbf.newDocumentBuilder(); 
        }catch(Exception ex) { 
            ex.printStackTrace(); 
        } 
         
        Document doc = dbuilder.newDocument();          
        Element root = doc.createElement("学生花名册"); 
        doc.appendChild(root); 
         
        Element stu = doc.createElement("学生"); 
        stu.setAttribute("性别","男"); 
        root.appendChild(stu); 
         
        Element stu_name = doc.createElement("姓名"); 
        stu.appendChild(stu_name); 
        Text name_text = doc.createTextNode("罗文雯"); 
        stu_name.appendChild(name_text); 
         
        Element stu_age = doc.createElement("年龄"); 
        stu.appendChild(stu_age); 
        Text age_text = doc.createTextNode("25"); 
        stu_age.appendChild(age_text); 
        try { 
            FileOutputStream fos = new FileOutputStream(xmlfile + "/test.xml"); 
            OutputStreamWriter osw = new OutputStreamWriter(fos); // 注意。。。 
            callDomWriter(doc, osw, "UTF-8"); 
            osw.close(); 
            fos.close(); 
        }catch(Exception ex) { 
            ex.printStackTrace(); 
        }                   
    } 
     
    private void callDomWriter(Document dom , Writer writer, String encoding) { 
        try {              
            Source source = new DOMSource(dom); 
            Result res = new StreamResult(writer); 
            Transformer xformer = TransformerFactory.newInstance().newTransformer(); 
            xformer.setOutputProperty(OutputKeys.ENCODING, encoding); 
            xformer.transform(source, res); 
        }catch (TransformerConfigurationException e) { 
            e.printStackTrace(); 
        } catch (TransformerException e) { 
            e.printStackTrace(); 
        }          
    } 
     
    public static void main(String []args) { 
        WriteXml writeins = new WriteXml(); 
        String outfile = "E:/tryfile/xml"; 
        writeins.writeXMLFile(outfile); 
        System.out.println("finished"); 
    } 
}