梅花树的动态加载和同一父结点的子结点的交换位置.??

我用的是梅花雪大侠的MzTreeView 1.0 ,我是用jsp实现的,但怎么都显示不出一棵树来.,请问怎么实现梅花树的动态加载和同一父结点的子结点的交换位置.??
最好有代码??  我的代码如下:
页面代码:
<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="tree.Treeview"%>
<%@ page import="java.util.*"%><head>
  
</head>
<body>
<script language="JavaScript" src="d:/MzTreeView10/MzTreeView10.js"></script>
<style>
A.MzTreeview
{
font-size: 9pt;
padding-left: 3px;
}
</style>
<script language="JavaScript">
var tree = new MzTreeView("tree");
tree.icons["property"] = "property.gif";
tree.icons["css"] = "collection.gif";
tree.icons["book"] = "book.gif";
tree.iconsExpand["book"] = "bookopen.gif"; //展开时对应的图片
tree.setIconPath("d://MzTreeView10//"); //可用相对路径
<%
   Treeview treeview=new Treeview();
   String node=treeview.getResultSet();
   out.write(node);
 
%> document.write(tree.toString());
</script></body>
</html>bean的代码:
package tree;import java.sql.*;
import java.util.*;public class Treeview
{
             Connection con=null;
             Statement stmt=null;
             ResultSet rs=null;
             String url="jdbc:mysql://localhost:3310/example?user=root&password=123";             public Treeview()
             {
                  try
                  {
                      Class.forName("org.gjt.mm.mysql.Driver");
                      con=DriverManager.getConnection(url);
                  }catch(Exception e)
                  {
                      e.printStackTrace();
                  }
             }             public String getResultSet()
             {
                String tree="";
                try {
                         stmt = con.createStatement();
                         rs=stmt.executeQuery("select * from tree");
                         while (rs.next())
                         {
                            
                            
                            String id=rs.getString("id");
                         
                        
                            String parentId=rs.getString("parentId");
                             tree+="\n"+"tree.nodes[\""+id+"_"+parentId+"\"]=\"";                            String text=rs.getString("text");
                            if(text!=null&&text.trim()!=(""))
                            {
                                  tree+="text:"+text+";";
                            }                            String data=rs.getString("data");
                            if(data!=null&&data.trim()!=(""))
                            {
                                   tree+="data:id="+id+";";
                            }                            String hint=rs.getString("hint");
                           if(hint!=null&&hint.trim().equals("")==false)
                           {
                                  tree+="hint:"+hint+";";
                           }                           String icon=rs.getString("icon");
                        
                           if(icon!=null&&icon.trim().equals("")==false)
                           {
                                   tree+="icon:"+icon+";";
                           }                           String url=rs.getString("url");
                           if(url!=null&&url.trim().equals("")==false)
                           {
                                    tree+="url:"+url+";";
                           }                           String target=rs.getString("target");
                           if(target!=null&&target.trim().equals("")==false)
                           {
                                    tree+="target:"+target+";";
                           }                           String method=rs.getString("method");
                           if(method!=null&&method.trim().equals("")==false)
                           {
                                     tree+="method:"+method+";";
                           }
                             tree=tree.substring(0,tree.trim().length());
                             tree+="\";";
                         
                           
                          }                         rs.close();
                         stmt.close();
                        
                }
               catch (SQLException sql)
               {
                         sql.printStackTrace();
               }                return tree;
             }}