asp.net实现验证码程序

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1、可以实现验证码的自动更新。

2、验证码html代码

                    <li class="mjiao2"><span>验 证 码：</span>                        <input class="search1" type="text" id="Txt_Code2"  runat="server" />                        <img id="img3" src="/VerifyCodeNew.aspx" title="看不清？点击更换" alt="验证码" style="cursor: pointer;                            margin-right: 20px;" onclick="this.src=this.src+'?';" width="100" height="32" />                     <%--   <div id="span_code2" style="color: Red;"></div>--%>                        <span id="span_code2" style="width: 100px;"></span>                    </li>

3、跳转页面。这里的页面只是空页面，主要是需要后台代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="VerifyCodeNew.aspx.cs" Inherits="VerifyCodeNew" %><!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></title></head><body>    <form id="form1" runat="server">    <div>        </div>    </form></body></html>

4、

using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Drawing;public partial class VerifyCodeNew : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        Initialization();    }    private void Initialization()    {        VerifyCodeNew v = new VerifyCodeNew();        v.Length = this.length;        v.FontSize = this.fontSize;        v.Chaos = this.chaos;        v.BackgroundColor = this.backgroundColor;        v.ChaosColor = this.chaosColor;        v.CodeSerial = this.codeSerial;        v.Colors = this.colors;        v.Fonts = this.fonts;        v.Padding = this.padding;        string code = v.CreateVerifyCode();                //取随机码        v.CreateImageOnPage(code, this.Context);        // 输出图片        Response.Cookies.Add(new HttpCookie("CheckCodeNew", code.ToUpper()));// 使用Cookies取验证码的值    }    #region how to use the code    //aspx page    //<img id="imgVerify" src="VerifyCode.aspx?" alt="看不清？点击更换" style="cursor:pointer" onclick="this.src=this.src+'?'" /><br />    /// <summary>    /// 验证输入    /// </summary>    /// <param name="code">验证码</param>    /// <returns>是否正确</returns>    private bool Checkcode(String code)    {        if (Request.Cookies["CheckCodeNew"] == null)            return false;//cookie不存在        if (String.Compare(Request.Cookies["CheckCodeNew"].Value, code.Trim().ToUpper(), true) != 0)            return false;//对不起，验证码错误！        else            return true;//恭喜，验证码输入正确    }    #endregion    #region 验证码长度(默认6个验证码的长度)    int length = 4;    private int Length    {        get { return length; }        set { length = value; }    }    #endregion    #region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)    int fontSize = 38;    private int FontSize    {        get { return fontSize; }        set { fontSize = value; }    }    #endregion    #region 边框补(默认1像素)    int padding = 2;    private int Padding    {        get { return padding; }        set { padding = value; }    }    #endregion    #region 是否输出燥点(默认输出)    bool chaos = true;    private bool Chaos    {        get { return chaos; }        set { chaos = value; }    }    #endregion    #region 输出燥点的颜色(默认灰色)    //Color chaosColor = Color.LightGray;    Color chaosColor = Color.Black;    private Color ChaosColor    {        get { return chaosColor; }        set { chaosColor = value; }    }    #endregion    #region 自定义背景色(默认白色)    Color backgroundColor = Color.White;    private Color BackgroundColor    {        get { return backgroundColor; }        set { backgroundColor = value; }    }    #endregion    #region 自定义随机颜色数组    Color[] colors = { Color.Black };    private Color[] Colors    {        get { return colors; }        set { colors = value; }    }    #endregion    #region 自定义字体数组    string[] fonts = { "Arial"};    private string[] Fonts    {        get { return fonts; }        set { fonts = value; }    }    #endregion    #region 自定义随机码字符串序列(使用逗号分隔)    string codeSerial = "1,2,3,4,5,6,7,8,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";    private string CodeSerial    {        get { return codeSerial; }        set { codeSerial = value; }    }    #endregion    #region 产生波形滤镜效果    private const double PI = 3.1415926535897932384626433832795;    private const double PI2 = 6.283185307179586476925286766559;    /// <summary>    /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）    /// </summary>    /// <param name="srcBmp">图片路径</param>    /// <param name="bXDir">如果扭曲则选择为True</param>    /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>    /// <param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>    /// <returns></returns>    private System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)    {        System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);        // 将位图背景填充为白色        System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);        graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);        graph.Dispose();        double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;        for (int i = 0; i < destBmp.Width; i++)        {            for (int j = 0; j < destBmp.Height; j++)            {                double dx = 0;                //dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;                dx += dPhase;                double dy = Math.Sin(dx);                // 取得当前点的颜色                int nOldX = 0, nOldY = 0;                nOldX = bXDir ? i + (int)(dy * dMultValue) : i;                nOldY = bXDir ? j : j + (int)(dy * dMultValue);                System.Drawing.Color color = srcBmp.GetPixel(i, j);                if (nOldX >= 0 && nOldX < destBmp.Width                 && nOldY >= 0 && nOldY < destBmp.Height)                {                    destBmp.SetPixel(nOldX, nOldY, color);                }            }        }        return destBmp;    }    #endregion    #region 生成校验码图片    private Bitmap CreateImageCode(string code)    {        int fSize = FontSize;        int fWidth = fSize + Padding;        int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;        int imageHeight = fSize * 2 + Padding;        System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);        Graphics g = Graphics.FromImage(image);        g.Clear(BackgroundColor);        Random rand = new Random();        //给背景添加随机生成的燥点        if (this.Chaos)        {            Pen pen = new Pen(ChaosColor, 0);            int c = Length * 70;            for (int i = 0; i < c; i++)            {                int x = rand.Next(image.Width);                int y = rand.Next(image.Height);                g.DrawRectangle(pen, x, y, 1, 1);            }        }        int left = 0, top = 0, top1 = 1, top2 = 1;        int n1 = (imageHeight - FontSize - Padding * 2);        int n2 = n1 / 4;        top1 = n2;        top2 = n2 * 2;        Font f;        Brush b;        int cindex, findex;        //随机字体和颜色的验证码字符        for (int i = 0; i < code.Length; i++)        {            cindex = rand.Next(Colors.Length - 1);            findex = rand.Next(Fonts.Length - 1);            f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Regular);            b = new System.Drawing.SolidBrush(Colors[cindex]);            if (i % 2 == 1)            {                top = top2;            }            else            {                top = top1;            }            left = i * fWidth;            g.DrawString(code.Substring(i, 1), f, b, left, top);        }        //画一个边框 边框颜色为Color.Gainsboro        g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);        g.Dispose();        //产生波形（Add By 51aspx.com）        image = TwistImage(image, true, 8, 4);        return image;    }    #endregion    #region 将创建好的图片输出到页面    private void CreateImageOnPage(string code, HttpContext context)    {        System.IO.MemoryStream ms = new System.IO.MemoryStream();        Bitmap image = this.CreateImageCode(code);        image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);        context.Response.ClearContent();        context.Response.ContentType = "image/Jpeg";        context.Response.BinaryWrite(ms.GetBuffer());        ms.Close();        ms = null;        image.Dispose();        image = null;    }    #endregion    #region 生成随机字符码    private string CreateVerifyCode(int codeLen)    {        if (codeLen == 0)        {            codeLen = Length;        }        string[] arr = CodeSerial.Split(',');        string code = "";        int randValue = -1;        Random rand = new Random(unchecked((int)DateTime.Now.Ticks));        for (int i = 0; i < codeLen; i++)        {            randValue = rand.Next(0, arr.Length - 1);            code += arr[randValue];        }        return code;    }    private string CreateVerifyCode()    {        return CreateVerifyCode(0);    }    #endregion}

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