登录页面 登录失败弹窗提醒帐号密码出错 并调回登陆页面问题

请大神麻烦编写代码 跪谢

@Controller

@RequestMapping("/*")

public class UserAction {

@RequestMapping("login.action")
    public String login(HttpSession session,String username,String password,RedirectAttributes ra,String yzm){
        Map<String, Object> parmas=new HashMap<String, Object>();
        String sessionYzm=(String) session.getAttribute("verCode");
        if(yzm.toLowerCase().equals(sessionYzm)){
        }else{
            return "redirect:/jsp/login.jsp";
        }
        parmas.put("logname", username);
        parmas.put("logpwd", password);
        User user=userService.slectUserByLognameAndLogpwd(parmas);
        if(user==null){
            return "redirect:/jsp/login.jsp";
        }
        String name=user.getLogname();
        String pass=user.getLogpwd();
        if(username.equals(name)&& password.equals(pass)){
            return "main";
            
        }else{
            return "redirect:/jsp/login.jsp";
        }
    }

}

jsp页面：

<%@ 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>登陆页面</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">
-->
<link rel="stylesheet" href="css/bace.css">
<link rel="stylesheet" href="css/common.css">
<link rel="stylesheet" href="css/login.css">
<script type="text/javascript" src="js/jquery.js"></script>

</head>

<body>

<div class="wrapper">
    <!-- 头部logo -->
    <header>
        <img src="images/1.png" alt="logo" class="logo">
        <img src="images/2.png" alt="舆情查询系统" class="title">
    </header>
    <!-- 内容登录区域 -->
    <section style="">
        <div class="nav">
            <!-- 内容区域logo标志 -->
            <img src="images/1.png" alt="">
        </div>
        <p class=""><span></span>用户登录<i></i></p>
        <form action="login.action" method="post" id="myForm" novalidate="novalidate">
            <div class="mt15">
                <label for="">用户名：&nbsp;&nbsp;</label><input type="text" name="username" value="" placeholder="请输入账号" required="required"
         maxlength="20"  data-msg-maxlength="用户名最多为20个字符"  data-msg-required="用户名不能为空"
         minlength="2" data-msg-minlength="用户名最少为2个字符" >
            </div>
            <div class="mt15">
                <label for="" style="margin-right:2px;">密&nbsp;&nbsp;&nbsp;码：&nbsp;&nbsp;</label><input type="text" name="password" value="" placeholder="" class=""
                required="required"  maxlength="20"  data-msg-maxlength="密码最多为20个字符"  data-msg-required="密码不能为空" minlength="2" data-msg-minlength="密码最少为2个字符" >
                <a href="" class="col_el3 p10" >忘记密码</a>
            </div>
            <div class="mt15 ">  
                <label for="">验证码：&nbsp;&nbsp;</label><input type="text" name="yzm" value=""  class="mr15 w90" required="required"
         maxlength="4"  data-msg-maxlength="密码为4个字符"  data-msg-required="密码不能为空"
         minlength="4" data-msg-minlength="密码为4个字符" >
                <!-- <div id="msg">
                
                </div> -->
                <img  id="yzm" alt="点击刷新" title="点击刷新"  src="creatYzm.action" style="height: 30px;width: 74px;position: absolute;cursor:pointer"  onclick="refresh()">
            </div>
            <div class="mt40 btn ml10" >
                <input type="submit" value="注册" class="mr15" >
                <input type="submit" value="登录" class="" >
            </div>
                    
        </form>
    </section>
    <!-- 底部的版权 -->
    <footer>
        <img src="images/3.png" alt="">
    </footer>
</div>

</body>

<script type="text/javascript" src="js/jquery.validate.js"></script>

<script type="text/javascript" src="js/messages_cn.js"></script>

<script type="text/javascript">

function refresh(){

var refreshUrl="creatYzm.action?"+new Date();

$("#yzm").attr("src",refreshUrl);

}

$().ready(function() {

$("#myForm").validate();

});

</script>

</html>

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