MVC-简单验证码制作

1、制作验证码：

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using Soft.Common;

namespace Soft.Controller
{

    ///<summary>
    /// 生成验证码的类
    ///</summary>
    public class ValidateCode
    {
        /// <summary>
        /// 保存验证码的cookie名字
        /// </summary>
        public static string ValidateCodeCookieName
        {
            get
            {
                return "SoftValidateCode";
            }
        }

        /// <summary>
        /// 生成验证码
        /// </summary>
        /// <returns></returns>
        public static string CreateValidateCode()
        {
            string checkCode = String.Empty;
            System.Random random = new Random();
            for (int i = 0; i < 4; i++)
            {
                checkCode += random.Next(0,9).ToString();
            }
            SessionCookieHelper.SetCookie(ValidateCodeCookieName, checkCode);
            return checkCode;
        }

        ///<summary>
        /// 创建验证码的图片
        ///</summary>
        ///<param name="containsPage">要输出到的page对象</param>
        ///<param name="validateNum">验证码</param>
        public static byte[] CreateValidateGraphic(string validateCode)
        {
            Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
            Graphics g = Graphics.FromImage(image);
            try
            {
                //生成随机生成器
                Random random = new Random();
                //清空图片背景色
                g.Clear(Color.White);
                //画图片的干扰线
                for (int i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }
                Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
                Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(validateCode, font, brush, 3, 2);
                //画图片的前景干扰点
                for (int i = 0; i < 100; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);
                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }
                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                //保存图片数据
                MemoryStream stream = new MemoryStream();
                image.Save(stream, ImageFormat.Jpeg);
                //输出图片流
                return stream.ToArray();
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
    }
}

2、新建一个验证码控制器和视图：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Soft.Controller;

namespace SoftWeb.Controllers
{
    public class ValiteController : Controller
    {
        //
        // GET: /Valite/

        public ActionResult Index()
        {
            return File(ValidateCode.CreateValidateGraphic(ValidateCode.CreateValidateCode()), @"image/jpeg");
        }

    }
}
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <div>
        
    </div>
</body>
</html>

3、使用时：

　　

 <script type="text/javascript">
        function refreshValidateCode(obj) {
            $("#ValidateCode").val("");
            obj.src = "/Controls/ValidateCode/Index?r=" + Math.random();
        }
    </script>

<img src="/Controls/ValidateCode/Index" onclick="refreshValidateCode(this);" />

4、可以加remote验证：

    public class CheckValidateCodeController : Controller
    {
        public JsonResult CheckValidateCode(string validateCode)
        {
            string cookie = SessionCookieHelper.GetCookieValue(ValidateCode.ValidateCodeCookieName);
            if (validateCode != cookie) { return Json("验证码不正确", JsonRequestBehavior.AllowGet); }
            else { return Json(true, JsonRequestBehavior.AllowGet); }
        }
    }



        [Display(Name = "验证码")]
        [Required(ErrorMessage = "*")]
        [StringLength(4, MinimumLength = 4, ErrorMessage = "请输入{1}位的{0}")]
        [Remote("CheckValidateCode", "CheckValidateCode", "Controls")]
        [DataType(DataType.Text)]
        public string ValidateCode { get; set; }

 

posted @ 2015-05-26 15:30  小-牛  阅读(232)  评论(0)  编辑  收藏  举报