关于jsp页面请求ajax之后数据返回不正确的疑问

本人java纯零基础，今天写了自己的第一个jsp代码，但是在请求ajax数据时，老是获取不到想要的数据。

需求是这样的，用户输入请求的页面，服务端解析请求的页面返回请求页面的html给客户端，我的代码是这样的

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
   pageEncoding="ISO-8859-1"%>
<%@ page import="java.io.*"%>
<%@ page language="java" import="java.net.*"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script language="JavaScript" src="js/jquery-1.7.2.min.js"></script>
<script language="JavaScript" src="js/connectToServer.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Web Security</title>
</head>
<body>

   <%
       String url = request.getParameter("url");
       String html = "";
       if (url != null && url != "") {
           String htmpath = null;
           BufferedReader in = null;
           InputStreamReader isr = null;
           InputStream is = null;
           PrintWriter pw = null;
           HttpURLConnection huc = null;

           try {
               htmpath = request.getParameter("username");

               URL urlObj = new URL(url); //åå»º URL
               System.out.println(url);
               huc = (HttpURLConnection) urlObj.openConnection();
               is = huc.getInputStream();
               isr = new InputStreamReader(is);
               in = new BufferedReader(isr);
               String line = null;

               while (((line = in.readLine()) != null)) {
                   if (line.length() == 0)
                       continue;
                   //System.out.println(line);
                   html += line;
               }
               System.out.println(html);
               System.out.println("hello");

           }

           catch (Exception e) {
               //System.err.println(e);
               out.println("xxx:" + e.getMessage());
           } finally { //æ è®ºå¦ä½é½è¦å³éæµ
               try {
                   is.close();
                   isr.close();
                   in.close();
                   huc.disconnect();
                   pw.close();
               } catch (Exception e) {
               }
           }
       }
   %>
   <table style="width: 50%" align='center'>
       <tr>
           <td width=60%><input id='txtUrl' value='http://www.baidu.com'></td>
           <td width=40%><input id='btnStart' type='button' value='Start'></td>
       </tr>
       <tr>
           <td colspan="2"><textarea style="width: 100%; height: 100px;">

           </textarea></td>
       </tr>
       <tr>
           <td colspan="2"><iframe id='ifm1'
                   style="width: 100%; height: 100%;"></iframe></td>
       </tr>
   </table>

</body>
</html>

$(function(){
    $("#btnStart").click(function(){

        var theURL = $("#txtUrl").val();
        alert("come in start URL:" + theURL);

        $.ajax({
            url: ' http://localhost:8080/index.jsp',
            type: 'post',
            data: 'url=' + theURL,
            dataType: 'text',
            error: function(XMLHttpRequest, textStatus, errorThrown){
                console.log('Error occurs at server.' + errorThrown);
                alert('Error occurs at server.' + errorThrown);
            },

            success: function(data){
               var s='<%=html %>';
               alert(s)
                alert("success:"+data);
                console.log("" + data);
                $("#ifm1").attr("srcdoc", data);
                //           if(data == "success"){


            }
        });
    })
})
上面标红的地方的数据不是想要的数据，求高手指导。

绝地无双

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关于jsp页面请求ajax之后数据返回不正确的疑问

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