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  • .net 验证码

     页面:

    <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>
    View Code

     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
        }
    }
    View Code

     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
        }
    }
    VerifyCode

    效果:

    说明:在这只是记录下东西,好多东西不是自己的,只是为了要用到时方便...

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  • 原文地址:https://www.cnblogs.com/jiang520/p/4874528.html
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