JQuery+AJax - 无刷新使用验证码 / 憋错料

最终效果：

项目目录：

Default.aspx前端代码：

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

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>

    <script src="js/jquery-1.8.3.min.js"></script>

    <script type="text/javascript">
        $(document).ready(function () {
            $("#getimgcode").click(function () {
                var imgSrc = $("#getcode");
                var src = imgSrc.attr("src");
                imgSrc.attr("src", chgUrl(src));
                $("#info").html("");//同时清空提示信息。
            })

            //时间戳
            //为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳
            function chgUrl(url) {
                var timestamp = (new Date()).valueOf();
                url = url.substring(0, 15);
                if ((url.indexOf("&") >= 0)) {
                    url = url + "×tamp=" + timestamp;
                } else {
                    url = url + "?timestamp=" + timestamp;
                }
                return url;
            }

            //检测验证码
            //文本框内容变化事件
            $(‘#myCode‘).bind(‘input propertychange‘, function () {
                if ($(this).val().length >= 6) {

                    //此处作用：实时的检测验证码是否正确。
                    //要求：但必须要当用户输入第4个字符时，才进行验证。
                    //原因：因为验证码是四位，所以输入第四个字符时验证，此处也可以用来验证账户名称等等。
                    var code = $("#myCode").attr("value");
                    code = "c=" + code;
                    $.ajax({
                        type: "POST",
                        url: "Verify.ashx",
                        data: code,
                        success: function (data) {
                            if (data == "0") {
                                $("#info").html("<b><i style = ‘color:#FF0000‘>Session为空！</i></b>");
                            }
                            if (data == "1") {
                                $("#info").html("<b><i style = ‘color:#FF0000‘>验证码填写错误！</i></b>");
                            }
                            if (data == "2") {
                                $("#info").html("<b><i style = ‘color:#3AAC54‘>验证码正确！</i></b>");
                            }
                        }
                    });
                }
                else {
                    $("#info").html("");//如果输入的字符不等于6位清空提示信息。
                }
            });
        })
    </script>

</head>
<body>
    <form id="form1" runat="server">
        <div>
            <table>
                <tr>
                    <td>
                        验证码：
                    </td>
                    <td>
                        <input id="myCode" type="text" runat="server" size ="8"/>
                    </td>
                    <td>
                        <img id ="getcode" src="VerifyCode.aspx" width ="85" height ="25" style ="border:1px solid #d3d1d1;"/>
                    </td>
                    <td>
                        <a id="getimgcode" href="Javascript:void(0)" title ="点击刷验证码">看不清？</a>
                    </td>
                    <td>
                        <span id ="info"></span>
                    </td>
                </tr>
            </table>
        </div>
    </form>
</body>
</html>

Default.aspx.cs后台代码：

原始生成，不做修改即可。

VerifyCode.aspx前台代码：

原始生成，不做修改即可。

VerifyCode.aspx.cs后台代码：　　

using System;
using System.Drawing;
using System.Web;

public partial class VerifyCode : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        validatedCode v = new validatedCode();
        string code = v.CreateVerifyCode();            //取随机码
        v.CreateImageOnPage(code, this.Context);       // 输出图片
        Session["CheckCode"] = code;                   //创建Session
    }

    public class validatedCode
    {
        #region  验证码长度(默认6个验证码的长度)
        int length = 6;
        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)
        int fontSize = 50;
        public int FontSize
        {
            get
            {
                return fontSize;
            }
            set
            {
                fontSize = value;
            }
        }
        #endregion

        #region 边框补(默认1像素)
        int padding = 2;
        public int Padding
        {
            get
            {
                return padding;
            }
            set
            {
                padding = value;
            }
        }
        #endregion

        #region 是否输出燥点(默认不输出)
        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)
        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)
        Color backgroundColor = Color.White;
        public Color BackgroundColor
        {
            get
            {
                return backgroundColor;
            }
            set
            {
                backgroundColor = value;
            }
        }
        #endregion

        #region 自定义随机颜色数组
        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
        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)
        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";
        public 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>
        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;

            //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（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
        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
    }
}

Veify.ashx代码：

其中如果要在一般处理程序中能使用 Session 的话。
要 using System.Web.SessionState; 。
并继承 IRequiresSessionState 接口。

<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using System.Web.SessionState;

public class Handler : IHttpHandler, IRequiresSessionState {

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        string VerifyCode = context.Request.Form["c"];
        if (context.Session["CheckCode"] == null)
        {
            context.Response.Write("0");//session为空！
        }
        else
        {
            string Verifycode = context.Session["CheckCode"].ToString().ToUpper();
            if (Verifycode != VerifyCode.ToUpper())
            {
                context.Response.Write("1");//验证码填写错误！
            }
            else
            {
                context.Response.Write("2");//验证码正确！
            }
        }
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}

时间： 2024-08-29 17:36:22

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