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    ASP.NET MVC验证码功能实现代码

    前台

    复制代码 代码如下:

    img id="vcodeimg" src="/Home/VCode" width="70"
                                        height="25" />
                                    nbsp;span
                                        style="cursor: pointer; text-decoration: underline">换一张/span>

    控制器
    复制代码 代码如下:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.Mvc;
    using Utility;
    using Jellal**;
    namespace sjlwebsite.Controllers
    {
        public class CommonController : Controller
        {
            #region 验证码
            [OutputCache(Duration = 0)]
            public ActionResult VCode()
            {
                string code = ValidateCode.CreateRandomCode(4);
                Session["vcode"] = code;
                ValidateCode.CreateImage(code);
                return View();
            }

            public string GetCode()
            {
                return Session["vcode"].ToStr();
            }
            #endregion
        }
    }

    验证码类

    复制代码 代码如下:

    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.SessionState;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;
    namespace Utility
    {
        ///  summary> 
        ///  完美随机验证码  0.10 
        ///  Verion:0.10 
        ///  Description:随机生成设定验证码,并随机旋转一定角度,字体颜色不同 
        ///  /summary> 
        public class ValidateCode
        {

            ///  summary> 
            ///  生成随机码 
            ///  /summary> 
            ///  param  name="length">随机码个数www.52mvc.com/param> 
            ///  returns>/returns> 
            public static string CreateRandomCode(int length)
            {
                int rand;
                char code;
                string randomcode = String.Empty;
                //生成一定长度的验证码 
                System.Random random = new Random();
                for (int i = 0; i length; i++)
                {
                    rand = random.Next();
                    if (rand % 3 == 0)
                    {
                        code = (char)('A' + (char)(rand % 26));
                    }
                    else
                    {
                        code = (char)('0' + (char)(rand % 10));
                    }
                    randomcode += code.ToString();
                }
                return randomcode;
            }
            ///  summary> 
            ///  创建随机码图片 
            ///  /summary> 
            ///  param  name="randomcode">随机码/param> 
            public static void CreateImage(string randomcode)
            {
                int randAngle = 45; //随机转动角度 
                int mapwidth = (int)(randomcode.Length * 23);
                Bitmap map = new Bitmap(mapwidth, 28);//创建图片背景 
                Graphics graph = Graphics.FromImage(map);
                graph.Clear(Color.AliceBlue);//清除画面,填充背景 
                graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, map.Width - 1, map.Height - 1);//画一个边框 
                //graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式 
                Random rand = new Random();
                //背景噪点生成    www.jb51.net
                Pen blackPen = new Pen(Color.LightGray, 0);
                for (int i = 0; i 50; i++)
                {
                    int x = rand.Next(0, map.Width);
                    int y = rand.Next(0, map.Height);
                    graph.DrawRectangle(blackPen, x, y, 1, 1);
                }
                //验证码旋转,防止机器识别   
                char[] chars = randomcode.ToCharArray();//拆散字符串成单字符数组 
                //文字距中 
                StringFormat format = new StringFormat(StringFormatFlags.NoClip);
                format.Alignment = StringAlignment.Center;
                format.LineAlignment = StringAlignment.Center;
                //定义颜色 
                Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
                //定义字体 
                string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
                for (int i = 0; i chars.Length; i++)
                {
                    int cindex = rand.Next(7);
                    int findex = rand.Next(5);
                    Font f = new System.Drawing.Font(font[findex], 13, System.Drawing.FontStyle.Bold);//字体样式(参数2为字体大小) 
                    Brush b = new System.Drawing.SolidBrush(c[cindex]);
                    Point dot = new Point(16, 16);
                    //graph.DrawString(dot.X.ToString(),fontstyle,new SolidBrush(Color.Black),10,150);//测试X坐标显示间距的 
                    float angle = rand.Next(-randAngle, randAngle);//转动的度数 
                    graph.TranslateTransform(dot.X, dot.Y);//移动光标到指定位置 
                    graph.RotateTransform(angle);
                    graph.DrawString(chars.ToString(), f, b, 1, 1, format);
                    //graph.DrawString(chars.ToString(),fontstyle,new SolidBrush(Color.Blue),1,1,format); 
                    graph.RotateTransform(-angle);//转回去 
                    graph.TranslateTransform(2, -dot.Y);//移动光标到指定位置 
                }
                //graph.DrawString(randomcode,fontstyle,new SolidBrush(Color.Blue),2,2); //标准随机码 
                //生成图片 
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                map.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                HttpContext.Current.Response.ClearContent();
                HttpContext.Current.Response.ContentType = "image/gif";
                HttpContext.Current.Response.BinaryWrite(ms.ToArray());
                graph.Dispose();
                map.Dispose();
            }

        }
    }

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