Dom4j格式化转义字符问题

<?xml version="1.0" encoding="UTF-8"?> 
<person> 
        <name>张三</name> 
        <addr><![CDATA[经三路<鑫苑>19F]]></addr> 
</person>

<?xml version="1.0" encoding="GBK"?>

<person>
  <toname>&lt;![CDATA[经三路&lt;鑫苑&gt;19F]]&gt;</toname>
</person>

import org.dom4j.Document; 
import org.dom4j.DocumentHelper; 
import org.dom4j.Element; 
import org.dom4j.io.OutputFormat; 
import org.dom4j.io.XMLWriter; 

import java.io.IOException; 
import java.io.StringWriter; 
import java.util.Date; 

/** 
* Created by IntelliJ IDEA. 
* 
* @author leizhimin 2010-7-10 16:03:39 
*/ 
public class Person { 
        private String name; 
        private String addr; 

        public Person(String name, String addr) { 
                this.name = name; 
                this.addr = addr; 
        } 

        public static void main(String[] args) { 
                Person p = new Person("张三", "经三路<鑫苑>19F"); 
                p.showXml(); 
        } 

        public void showXml() { 
                String xml1, xml2, xml3; 
                Document doc = DocumentHelper.createDocument(); 
                doc.setXMLEncoding("GBK"); 
                Element root = doc.addElement("person"); 
                if (addr != null) 
                        addElement(root, "toname", "<![CDATA[" + this.addr + "]]>"); 
                else 
                        addElement(root, "toname", this.addr); 

                xml1 = doc.asXML();                                        //默认转义 
                xml2 = formatXml(doc, "GBK", true);        //转义 
                xml3 = formatXml(doc, "GBK", false);     //不转义 
                System.out.println(xml1); 
                System.out.println("-------------------------"); 
                System.out.println(xml2); 
                System.out.println("-------------------------"); 
                System.out.println(xml3); 
        } 

        /** 
         * 在指定的元素下添加一个新的子元素 
         * 
         * @param e         父元素 
         * @param name    子元素名 
         * @param value 子元素值 
         * @return 新加子元素 
         */ 
        public static Element addElement(Element e, String name, Object value) { 
                Element x = e.addElement(name); 
                if (value == null || "".equals(value.toString().trim())) { 
                        x.setText(""); 
                } else if (value instanceof Date) { 
                        x.setText(DateToolkit.toISOFormat((Date) value)); 
                } else { 
                        x.setText(value.toString()); 
                } 
                return x; 
        } 

        /** 
         * 格式化XML文档 
         * 
         * @param document xml文档 
         * @param charset    字符串的编码 
         * @param istrans    是否对属性和元素值进行转移 
         * @return 格式化后XML字符串 
         */ 
        public static String formatXml(Document document, String charset, boolean istrans) { 
                OutputFormat format = OutputFormat.createPrettyPrint(); 
                format.setEncoding(charset); 
                StringWriter sw = new StringWriter(); 
                XMLWriter xw = new XMLWriter(sw, format); 
                xw.setEscapeText(istrans); 
                try { 
                        xw.write(document); 
                        xw.flush(); 
                        xw.close(); 
                } catch (IOException e) { 
                        System.out.println("格式化XML文档发生异常，请检查！"); 
                        e.printStackTrace(); 
                } 
                return sw.toString(); 
        } 
}