看如下代码,用编码方式加以解决
package test; 
import java.io.*; 
public class DOMTest 
{ 
private String inFile = "c:\\people.xml" 
private String outFile = "c:\\people.xml" 
public static void main(String args[]) 
{ 
new DOMTest(); 
} 
public DOMTest() 
{ 
try 
{ 
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("王");
org.w3c.dom.Element liu = doc.createElement("刘");
wang.appendChild(doc.createTextNode("我是王老师"));
root.appendChild(wang); 
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(newjavax.xml.transform.dom.DOMSource(doc),
new
javax.xml.transform.stream.StreamResult(outFile));
} 
catch (Exception e) 
{ 
System.out.println (e.getMessage()); 
}