关于jQuery的AJAX的load里回调函数的data小问题


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <title>ddd</title>
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
        <script type="text/jscript" src="../js/jquery-1.8.2.js">
        </script>
        <style type="text/css">
            div, span {
                width: 140px;
                height: 140px;
                margin: 20px;
                background: #9999CC;
                border: #000 1px solid;
                float: left;
                font-size: 17px;
                font-family: Roman;
            }
            
            div.mini {
                width: 30px;
                height: 30px;
                background: #CC66FF;
                border: #000 1px solid;
                font-size: 12px;
                font-family: Roman;
            }
            
            div.visible {
                display: none;
            }
        </style>
        <!--引入jquery的js库-->
    </head>
    <body>
        <form action="" name="form1" id="form1">
            <input type="text" name="username" id="username" value="zhang">
            <br>
            <input type="text" name="psw" id="psw" value="">
            <br>
            <input type="button" id="b1" value="登陆">
        </form>
        <div id="one">
        </div>
    </body>
    <script type="text/jscript">
     $(document).ready(function(){
$("#b1").click(function(){
$("#one").load("load01.jsp h1",{username:$("#username").val(),psw:$("#psw").val()},function(data,textStatus,XMLHttpRequest){
alert(data);
});
});
});  
    </script>
</html><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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 'test.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->  </head>
  
  <body>
    <%
     out.println("成功"); 
     String username = request.getParameter("username");
     String psw = request.getParameter("psw");
     System.out.println("username   "+username);
     System.out.println("psw]   "+psw);
    %>
    <h1>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</h1>
  </body>
</html>小弟的问题是在alert(data);  只想取到'成功'这两个字,可是运行代码后alert出来的是jsp整个页面源代码,小弟第一次运行的时候还能alert出来'成功'这两个字,不知怎么搞的就变成这样了。求大神啊！！！