C#生成验证码

生成验证码的类：

using System;
 System.Collections.Generic;
 System.Drawing;
 System.Text;

namespace Controllers.Core.Util
{
    /// <summary>
    /// 验证码
    </summary>
    public class VerifyCodeHelper : AdminBaseController
    {
        #region 变量
        <summary>
         颜色表
        </summary>
        private static Color[] colors = new Color[]{
            Color.FromArgb(220,20,1)">60),Color.FromArgb(128,1)">0,1)">12865,1)">105,1)">22570,1)">130,1)">18046,1)">139,1)">87184,1)">134,1)">11255,1)">140,1)">069,1)">19191,1)">25595,1)">158,1)">160147165,1)">)};

         字体表
        static string[] fonts = new string[] { 
            "Arial",VerdanaGeorgia黑体 };

         字体大小
        int fontSize = 22;
        #endregion

        #region 生成验证码图片
         生成验证码图片
        static Bitmap CreateVerifyCodeBmp(out  code)
        {
            int width = 120;
            int height = 40;
            Bitmap bmp =  Bitmap(width,height);
            Graphics g = Graphics.FromImage(bmp);
            Random rnd =  Random();

            //背景色
            g.FillRectangle(new SolidBrush(Color.White),new Rectangle(文字
            StringBuilder sbCode =  StringBuilder();
            for (int i = 0; i < 4; i++)
            {
                string str = GetChar(rnd);
                Font font = GetFont(rnd);
                Color color = GetColor(rnd);
                g.DrawString(str,font,new SolidBrush(color),1)">new PointF((float)(i * width / 4.0),1)">));
                sbCode.Append(str);
            }
            code = sbCode.ToString();

            噪音线
            10; i++int x1 = rnd.Next(bmp.Width);
                int x2 =int y1 = rnd.Next(bmp.Height);
                int y2 = rnd.Next(bmp.Height);

                Pen p = new Pen(GetColor(rnd),1)">1);
                g.DrawLine(p,x1,y1,x2,y2);
            }

            扭曲
            bmp = Twistimage(bmp,1)">true,1)">3,rnd.NextDouble() * Math.PI * 2);
            g = Graphics.FromImage(bmp);

            噪点
            100; i++);
                g.DrawRectangle(p,1)">1,1)">);
            }

            边框
            g.DrawRectangle(new Pen(new SolidBrush(Color.FromArgb(153,1)">153))),width - ));

            return bmp;
        }
        #region 获取随机字符
         获取随机字符
         GetChar(Random rnd)
        {
            int n = rnd.Next(61);
            if (n <= 9return ((char)(48 + n)).ToString();
            }
            else 3565 + n - 10)).ToString();
            }
            else
            {
                97 + n - 36)).ToString();
            }
        }
        #region 获取随机字体
         获取随机字体
        static Font GetFont(Random rnd)
        {
            return new Font(fonts[rnd.Next(#region 获取随机颜色
         获取随机颜色
         Color GetColor(Random rnd)
        {
            return colors[rnd.Next(#region 正弦曲线Wave扭曲图片
        <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 name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3<param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>   
        static System.Drawing.Bitmap Twistimage(Bitmap srcBmp,1)">bool bXDir,1)">double dMultValue,1)">double dPhase)
        {
            System.Drawing.Bitmap destBmp =  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),destBmp.Width,destBmp.Height);
            graph.dispose();

            double dBaseAxisLen = bXDir ? (double)destBmp.Height : ()destBmp.Width;

            0; i < destBmp.Width; i++int j = 0; j < destBmp.Height; j++)
                {
                    double dx = ;
                    dx = bXDir ? (Math.PI * 2 * (double)j) / dBaseAxisLen : (Math.PI * double)i) / dBaseAxisLen;
                    dx += dPhase;
                    double dy = Math.Sin(dx);

                     取得当前点的颜色   
                    int nOldX = ;
                    nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
                    nOldY = bXDir ? j : j + ( 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);
                    }
                }
            }

             destBmp;
        }
        #endregion

    }
}

View Code

验证码页面Action：

public ActionResult VerifyCode()
{
     code;
    Bitmap bmp = VerifyCodeHelper.CreateVerifyCodeBmp(out code);
    Bitmap newbmp = new Bitmap(bmp,1)">108,1)">);
    HttpContext.Session[VerifyCode"] = code;

    Response.Clear();
    Response.ContentType = image/bmp;
    newbmp.Save(Response.OutputStream,System.Drawing.Imaging.ImageFormat.Bmp);

     View();
}

View Code

说明：前台页面为空的cshtml页面，验证码的值放在Session中。

 

使用验证码的页面：

显示验证码的img：

<img id="verifyCode" src="" alt="验证码" style="vertical-align: middle;" />

页面加载完成后，显示验证码(注意，要加上时间戳，不然刷新页面时验证码不刷新)：

$(function () {
    刷新验证码
    $("#refreshVerifyCode").click( () {
        refreshVerifyCode(); 刷新验证码
    });
    $("#verifyCode").click(    });
    refreshVerifyCode();
});

刷新验证码：

 refreshVerifyCode() {
    $("#verifyCode").attr("src","VerifyCode?t=" +  Date().valueOf());
}

 

判断用户输入的文本是否与验证码相同的Action：

public ActionResult CheckVCode( vcode)
{
    if (HttpContext.Session["].ToString().ToLower() == vcode.ToLower())
    {
        Dictionary<string,1)">object> dic = new Dictionary<object>();
        dic[ok"] = true Content(JsonConvert.SerializeObject(dic));
    }
    
    {
        Dictionary<false Content(JsonConvert.SerializeObject(dic));
    }
}

View Code