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());
        }
    }