用JDOM解析XML文件时如何解决中文问题？如何解析？

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.transform.OutputKeys;
 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 DOMTest {
     private String inFile = "D:\\test.xml";
     private String outFile = "D:\\test.xml";

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

     public DOMTest() {
         try {
             //1、获取DOM解析器工厂，以便产生解析器；2、获取DOM解析器，以便解析DOM
             DocumentBuilder builder = DocumentBuilderFactory
                     .newInstance().newDocumentBuilder();
             Document doc = builder.newDocument();
             //创建元素
             Element root = doc.createElement("person");
             Element a = doc.createElement("name");
             Element b = doc.createElement("age");
             //向指定元素节点中增加子元素节点或增加元素到子节点
             a.appendChild(doc.createTextNode("小白"));
             b.appendChild(doc.createTextNode("18岁"));
             root.appendChild(a);
             root.appendChild(b);
             doc.appendChild(root);
             //设置后要把DOM写回XML文件
             Transformer transformer = TransformerFactory
                     .newInstance().newTransformer();
             //编码指定Transformer应该使用的首选字符编码，将字符序列作为字节序列进行编码
             transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312");
             //缩进指定Transformer是否可以添加额外的空白，同时输出
             transformer.setOutputProperty(OutputKeys.INDENT, "yes");
             transformer.transform(new DOMSource(doc), new StreamResult(outFile));
         } catch (Exception e) {
             System.out.println(e.getMessage());
         }
     }