ASP.NET MVC验证码功能实现代码

前台

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

控制器

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

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.gaodaima.com            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.Curre<strong>本文来源gaodai#ma#com搞@@代~&码网</strong>nt.Response.BinaryWrite(ms.ToArray());            graph.Dispose();            map.Dispose();        }    }}

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