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    .net生成验证码

    本文为大家分享了.net生成验证码所有代码,大家可以动手操作一下,会有意想不到的收获。

    先给大家看看效果图:

    页面代码:

    html xmlns="http://www.w3.org/1999/xhtml">
    head runat="server">
      title>验证码/title>
      script type="text/javascript">
        //换一张
        function change() {
          var img = document.getElementById("ValidateCode");
          img.src = img.src + '?';
        }
      /script>
    /head>
    body>
      form id="form1" runat="server">
      div>
        table>
          tr>
            th>
              验证码
            /th>
            td>
              asp:TextBox runat="server" ID="tbCheckCode" CssClass="Small" MaxLength="4">/asp:TextBox>
            /td>
            td>
              img src="VerifyCode.aspx" id="ValidateCode" alt="换一张" onclick="javascript:change()" />
            /td>
            td>
              a id="ChangeCode" href="#" onclick="javascript:change()">换一张/a>
            /td>
          /tr>
          tr>
            td>
              asp:Button runat="server" ID="LoginSubmit" OnClick="LoginSubmits" Text="登录" />
            /td>
          /tr>
        /table>
      /div>
      /form>
    /body>
    /html>

    后台代码:

        /// summary>
        /// 登录
        /// /summary>
        /// param name="sender">/param>
        protected void LoginSubmits(object sender, EventArgs e)
        {
          CheckLogin();
        }
    
        #region 私有方法
        #region
        public static Boolean IsNotNull(Object str)
        {
          return !IsNull(str);
        }
        public static Boolean IsNull(Object str)
        {
          return str == null;
        }
        public static void Show(System.Web.UI.Page page, string msg)
        {
          page.ClientScript.RegisterStartupScript(page.GetType(), "message",
            "script language='javascript' defer>alert('" + msg.ToString() + "');/script>");
        }
        #endregion
    
        private void CheckLogin()
        {
          if (tbCheckCode.Text.Trim() == "")
          {
            Show(this, "验证码不能为空!");
            return;
          }
          else
          {
            if (IsNotNull(Session["ValidateCheckCode"]))
            {
              if (tbCheckCode.Text.Trim() != Session["ValidateCheckCode"].ToString())
              {
                Show(this, "验证码填写不正确!");
                tbCheckCode.Text = "";
                return;
              }
            }
            else
            {
              Show(this, "请刷新验证码!");
              return;
            }
          }
        }
        #endregion
      }
    }
    
    

    生成验证码:

    using System;
    using System.Drawing;
    using System.Text;
    using System.Web;
    
    namespace Web.TEXT
    {
      public partial class VerifyCode : System.Web.UI.Page
      {
        public Encoding GB = Encoding.GetEncoding("GB2312");
    
        protected void Page_Load(object sender, EventArgs e)
        {
          VerifyCode v = new VerifyCode();
    
          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("CheckCode", code.ToUpper())); // 使用Cookies取验证码的值
    
          System.Web.HttpContext.Current.Session["ValidateCheckCode"] = code;
          //return checkCode;
        }
    
        #region 验证码长度(默认4个验证码的长度)
    
        private int length = 4; 
    
        public 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)
    
        private int fontSize = 12;
    
        public int FontSize
        {
          get { return fontSize; }
          set { fontSize = value; }
        }
    
        #endregion
    
        #region 边框补(默认1像素)
    
        private int padding = 1;
    
        public int Padding
        {
          get { return padding; }
          set { padding = value; }
        }
    
        #endregion
    
        #region 是否输出燥点(默认不输出)
    
        private bool chaos = true;
    
        public bool Chaos
        {
          get { return chaos; }
          set { chaos = value; }
        }
    
        #endregion
    
        #region 输出燥点的颜色(默认灰色)
    
        private Color chaosColor = Color.LightGray;
    
        public Color ChaosColor
        {
          get { return chaosColor; }
          set { chaosColor = value; }
        }
    
        #endregion
    
        #region 自定义背景色(默认白色)
    
        private Color backgroundColor = Color.White;
    
        public Color BackgroundColor
        {
          get { return backgroundColor; }
          set { backgroundColor = value; }
        }
    
        #endregion
    
        #region 自定义随机颜色数组
    
        private Color[] colors =
        {
          Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown,
          Color.DarkCyan, Color.Purple
        };
    
        public Color[] Colors
        {
          get { return colors; }
          set { colors = value; }
        }
    
        #endregion
    
        #region 自定义字体数组
    
        private string[] fonts = {"Arial", "Georgia"};
    
        public 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)
    
        private string codeSerial = "0,1,2,3,4,5,6,7,8,9";
        // string codeSerial = "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,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";
        // string codeSerial = "殃,央,鸯,秧,杨,扬,佯,疡,羊,洋,阳,氧,仰,痒,养,样,漾,邀,腰,妖,瑶,摇,尧,遥,窑,谣,姚,咬,舀,药,要,耀,椰,噎,耶,爷,野,冶,也,页,掖,业,叶,曳,腋,夜,液,一,壹,医,揖,铱,依,伊,衣,颐,夷,遗,移,仪,胰,疑,沂,宜,姨,彝,椅,蚁,倚,已,乙,矣,以,艺,抑,易,邑,屹,亿,役,臆,逸,肄,疫,亦,裔,意,毅,忆,义,益,溢,诣,议,谊,译,异,翼,翌,绎,茵,荫,因,殷,音,阴,姻,吟,银,淫,寅,饮,尹,引,隐,印,英,樱,婴,鹰,应,缨,莹,萤,营,荧,蝇,迎,赢,盈,影,颖,硬,映,哟,拥,佣,臃,痈,庸,雍,踊,蛹,咏,泳,涌,永,恿,勇,用,幽,优,悠,忧,尤,由,邮,铀,犹,油,游,酉,有,友,右,佑,釉,诱,又,幼,迂,淤,于,盂,榆,虞,愚,舆,余,俞,逾,鱼,愉,渝,渔,隅,予,娱,雨,与,屿,禹,株,蛛,朱,猪,诸,诛,逐,竹,烛,煮,拄,瞩,嘱,主,著,柱,助,蛀,贮,铸,筑,住,注,祝,驻,抓,爪,拽,专,砖,转,撰,赚,篆,桩,庄,装,妆,撞,壮,状,椎,锥,追,赘,坠,缀,谆,准,捉,拙,卓,桌,琢,茁,酌,啄,着,灼,浊,兹,咨,资,姿,滋,淄,孜,紫,仔,籽,滓,子,自,渍,字,鬃,棕,踪,宗,综,总,纵,邹,走,奏,揍,租,足,卒,族,祖,诅,阻,组,钻,纂,嘴,醉,最,罪,尊,遵,昨,左,佐,柞,做,作,坐,座";
        public string CodeSerial
        {
          get { return codeSerial; }
          set { codeSerial = value; }
        }
    
        #endregion
    
        //产生波形滤镜效果
    
        #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>
        public 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
    
        public 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*10;
    
            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;
    
          #region 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.Bold);
            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
          //image = TwistImage(image, true, 8, 4);
    
          return image;
        }
    
        #endregion
    
        //将创建好的图片输出到页面
        public 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
    
        public 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;
        }
    
        public string CreateVerifyCode()
        {
          return CreateVerifyCode(0);
        }
    
        #endregion
      }
    }
    

    是不是很有成就感,为大家分享的代码很完整,大家可以在这个基础进行扩展,希望大家喜欢。

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