struts2中js实现把后台的list传到前台页面显示

我想做一个点击一个下拉框中的选项，然后在这个页面的下方显示该选项下的一些字段信息。高手帮帮忙，搞了快两天了。在线等啊！！！！

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onchange出发js，用ajax发送下拉框选中选项的value给struts，返回一段文字，回调函数写进div
能具体点吗？我刚学这玩意
function redirect(){
  alert("000000000");
   $.ajax({
        type:"get",
        url:"../CategoryFileManagerO/cfmaction8.action",
        data:{achid:$("#cglb").val()},
        dataType:"json",
        success: function(data) {

          $.each(data,function(apptargetlist, apptarget) {
           alert(apptarget.tarname);
     })

}
},"json");
}
我得到了后台的数据，但怎么显示到页面？还有得到的可能是字符串形式的
我的qq是774087258，你能不能加qq详细给我说一下，我这时间比较紧
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 't.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  <script type="text/javascript" src="jquery-1.4.min.js"></script>
  <script type="text/javascript">
   $(document).ready(function(){
   $("#test").click(function(){
   $.ajax({
   url:"testAction!ajax.action",
   type:"post",
   data:{id:1},
   success:function(result){
   $("#div").html(result);
   }
   });
   });
   });
  </script>
  </head>

  <body>
    <input type="button" id="test" value="show">
    <div id="div"></div>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 't.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  <script type="text/javascript" src="jquery-1.4.min.js"></script>
  <script type="text/javascript">
   $(document).ready(function(){
   $("#test").click(function(){
   $.ajax({
   url:"testAction!ajax.action",
   type:"post",
   data:{id:1},
   success:function(result){
   $("#div").html(result);
   }
   });
   });
   });
  </script>
  </head>

  <body>
    <input type="button" id="test" value="show">
    <div id="div"></div>
  </body>
</html>
result是什么数据类型？String还是list？如果是list的话，我想用迭代器在页面上显示出来，该怎么写？
public String querryAppTarget(){
System.out.println("进入action的querryAppTarget方法");
System.out.println("01");
System.out.println(achid);
apptargetlist = new ArrayList<AppTarget>();
apptargetlist = cfmdao.querryAppTarget(achid);
jsonrusult=JSONArray.fromObject(apptargetlist);
System.out.println("02");
return this.SUCCESS;
}
---------------------这是我后台的action-------------------------------
function redirect(){
  alert("000000000");   $.ajax({
        type:"get",
        url:"../CategoryFileManagerO/cfmaction8.action",
        data:{achid:$("#cglb").val()},
        dataType:"json",
        success: function(data) {

        alert(data);
        $("#resultId").html(data);
                   }});
}
--------------前台的jquery------------------
[com.hanet.sip.pojo.AppTarget@5fe9c4, com.hanet.sip.pojo.AppTarget@ec5584]
------------------这是alert出来的data-----------------
可以把你的List拼成json字符串，再转成js对象操作
能不能具体点？我从后台得到的数据和前台打印出来的完全一样，但是我在前台想输出对象的属性时报defined。