兑现复杂的证验码

最新推荐文章于 2025-08-11 23:19:59 发布

liangdiwei

最新推荐文章于 2025-08-11 23:19:59 发布

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CC 4.0 BY-SA版权

文章标签： image javascript random oracle c# border

本文链接：https://blog.youkuaiyun.com/liangdiwei/article/details/5094293

Default.aspx代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
<script language="javascript">
//验证码：读取cookie中的值
function readCookie()
{
//判断是否存在cookie
var isExist = document.cookie.indexOf("imgRandom=");
//alert(isExist);
if(isExist!=-1)
{
//“imgRandom=”后面的等号的位置
var c= document.cookie.indexOf("=",isExist)+1;
//获取等号后面的字符串，也就是所需要的验证码！
var str = document.cookie.substring(c)
//alert(document.cookie.substring(c));
if(document.getElementById("Image").value!=str)
{
document.getElementById("Image").select();
alert("验证码输入错误！")
return false;
}else
{
return true;
}
}
}
//onload = readCookie;
//获取图片的src
function imgSrc()
{
// 通过链接让图片中的src发生变化
document.getElementById("imgRandom").src = document.getElementById("imgRandom").src + "?abc=" + Math.random();
}
</script>
</head>
<body>
<form name="vcode" action="Default.aspx" method="post" onsubmit=" readCookie()">
验证码 : <input id="Image" type="text" name="checkImage" style="width: 72px; height:20px" /><span style="vertical-align:bottom"><img id="imgRandom" src="Randomimage.aspx" alt="" /></span><a href="javascript:imgSrc()">看不清换一张</a><br />
<input type="submit" value="确定" style="border:solid 1px black" />
</form>
</body>
</html>

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
    
    <script language="javascript">
      //验证码：读取cookie中的值
        function readCookie()
        {
            
            //判断是否存在cookie
            var isExist = document.cookie.indexOf("imgRandom=");
            //alert(isExist);
            if(isExist!=-1)
            {
                //“imgRandom=”后面的等号的位置
                var c=  document.cookie.indexOf("=",isExist)+1;
                //获取等号后面的字符串，也就是所需要的验证码！
                var str = document.cookie.substring(c)
                //alert(document.cookie.substring(c));
                
                if(document.getElementById("Image").value!=str)
                {
                     
                     document.getElementById("Image").select();
               
                     alert("验证码输入错误！")
                     return false;
                }else
                {
                 return true;
                }
            }
        }
      
        //onload = readCookie;
        //获取图片的src
        function imgSrc()
        {
           
        
            // 通过链接让图片中的src发生变化
           document.getElementById("imgRandom").src = document.getElementById("imgRandom").src + "?abc=" + Math.random();

         
        }
        
    
 
    </script>
</head>
<body>

<form name="vcode" action="Default.aspx" method="post" onsubmit=" readCookie()">
   验证码 :  <input  id="Image" type="text" name="checkImage" style="width: 72px; height:20px" /><span style="vertical-align:bottom"><img id="imgRandom" src="Randomimage.aspx" alt="" /></span><a href="javascript:imgSrc()">看不清换一张</a><br />
   
   <input type="submit" value="确定" style="border:solid 1px black" />
   </form>
</body>
</html>

Default.aspx.cs代码

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
}

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}

Randomimage.aspx代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Randomimage.aspx.cs" Inherits="Randomimage" %>

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Randomimage.aspx.cs" Inherits="Randomimage" %>

Randomimage.aspx.cs代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Drawing;
using System.IO;
public partial class Randomimage :System.Web.UI.Page
{
public void Page_Load(object sender, EventArgs e)
{
string random = this.random();
/*
* 将随机数字添加到cookie中
*/
//添加cookie
//imgCookie.Value = random;
//this.Response.Cookies.Add(imgCookie);
//this.Response.Write(imgCookie.Value);
/*
* 图片加载的时候，在图片上写随机数
*/
int width = Convert.ToInt32(random.Length * 25);
using (Bitmap image = new Bitmap(width, 40))
{
//应用画板，在画板上书写数字
using (Graphics gp = Graphics.FromImage(image))
{
//用字符串的形式书写数字
//gp.DrawString(random, new Font("宋体", 24), Brushes.Red, new PointF(20.0F, 10.0F));
gp.Clear(Color.White);
Font font = new Font("隶书", 24, FontStyle.Bold);
System.Drawing.Drawing2D.LinearGradientBrush brush =
new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.DarkOrchid, Color.Blue, 3.5f, true);
gp.DrawString(random, font, brush, 3, 2);
this.drawLine(gp, image);
}
//显示图片
//image.Save(this.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
MemoryStream ms = new MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
//输出图片
Response.ClearContent();
Response.ContentType = "text/html";
Response.BinaryWrite(ms.ToArray());
}
HttpCookie imgCookie = null;
if (this.Request.Cookies["imgRandom"] == null)
{
imgCookie = new HttpCookie("imgRandom");
imgCookie.Value = random;
this.Response.Cookies.Add(imgCookie);
//this.Response.Redirect("image.aspx");
}
else
{
imgCookie = new HttpCookie("imgRandom");
imgCookie.Value = random;
this.Response.Cookies.Add(imgCookie);
}
}
/*
* 随机数字的获取
*/
public string random()
{
//string number = "";
//Random random = new Random();
//for (int i = 0; i < 4; i++)
//{
// number += (random.Next(0, 10)).ToString();
//}
string guid = Guid.NewGuid().ToString();
string rtuStr = Guid.NewGuid().ToString().Substring(1, 4);
return rtuStr;
}
private void drawPoint(Bitmap img)
{
Random ran = new Random();
int col = ran.Next();//在一次的图片中杂店颜色相同
for (int i = 0; i < 100; i++)
{
int x = ran.Next(img.Width);
int y = ran.Next(img.Height);
img.SetPixel(x, y, Color.FromArgb(col));
}
}
private void drawLine(Graphics gfc, Bitmap img)
{
Random ran = new Random();
//选择画10条线,也可以增加，也可以不要线，只要随机杂点即可
for (int i = 0; i < 10; i++)
{
int x1 = ran.Next(img.Width);
int y1 = ran.Next(img.Height);
int x2 = ran.Next(img.Width);
int y2 = ran.Next(img.Height);
gfc.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); //注意画笔一定要浅颜色，否则验证码看不清楚
}
}
}