验证码的问题

iPhone_XiaoC 2010-09-29 07:26:06

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>

<%@page import="beans.FirstBean" %>

<%

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 'MyJsp.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 onload="createCode()">



<style type="text/css">  

        .code   

        {   

            background-image:url(code.jpg);   

            font-family:Arial;   

            font-style:italic;   

            color:Red;   

            border:0;   

            padding:2px 3px;   

            letter-spacing:3px;   

            font-weight:bolder;   

        }   

        .unchanged   

        {   

            border:0;   

        }   

    </style>  

    <script language="javascript" type="text/javascript">  

       

     var code ; //在全局 定义验证码   

     function createCode()   

     {    

       code = "";   

       var codeLength = 6;//验证码的长度   

       var checkCode = document.getElementById("checkCode");   

       var selectChar = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');//所有候选组成验证码的字符，当然也可以用中文的      

       for(var i=0;i<codeLength;i++)   

       {   

        var charIndex = Math.floor(Math.random()*36);   

        code +=selectChar[charIndex];   

       }    

       if(checkCode)   

       {   

         checkCode.className="code";   

         checkCode.value = code;

         checkCode.blur();   

       }        

     }     

     function validate ()   {   

       var inputCode = document.getElementById("validCode").value;   

       if(inputCode.length <=0)   

       {   

           alert("请输入验证码！");   

       }   

       else if(inputCode.toUpperCase() != code )   

       {   

          alert("验证码输入错误！");   

          createCode();//刷新验证码   

       }   

       else   

       {   

         alert("^-^ OK");   

       }   

 }   

       

    </script>  

    <form  action="#">  

     <input  type="text"   id="validCode" />  

    <input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px;cursor:pointer"  /><br />  

    <input id="Button1"  onclick="validate();" type="button" value="确定" />    

</form>



  

  </body>

</html>