MVC登录验证码实现

来源:互联网 发布:html5手机表白源码 编辑:程序博客网 时间:2024/05/22 02:00

前言:经过不断的尝试,终于写出了简单的验证效果了,看了好多大神写的代码感觉都看蒙了,我喜欢没写个功能然后把自己的代码整理成小案例,方便以后学习。
效果图
这里写图片描述
前端代码:
步骤一:html代码

/*引入js*/<script src="~/Scripts/jquery-1.10.2.js"></script>/*html代码*/<h2>验证码实现</h2><div id="row" style="width:320px; height:100px; ">    <input id="txt_code" maxlength="4" type="text" placeholder="验证码" style="width:190px; float:left" />    <div style="width:130px; float:right; padding-top:4px; padding-left:14px;">        看不清?        <a id="switchCode" href="javascript:void();" style="text-decoration:none;">换一张</a>        <img id="imgcode" class="authcode" src="/Login/GetAuthCode" width="80" height="25" />    </div></div>步骤二:js代码<script>    $("#switchCode").click(function () {        $("#imgcode").attr("src", "/Login/GetAuthCode?time=" + Math.random());    });</script>

后台代码
步骤3:添加一个VerifyCode类文件:

using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Imaging;using System.IO;using System.Linq;using System.Web;namespace Ddmo{    public class VerifvCode    {        public byte[] GetVerifvCode() {            int codeW = 80;            int codeH = 30;            int fontSize = 16;            string chkCode = string.Empty;            //颜色列表,用于验证码、噪线、噪点            Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };            //字体列表,用于验证码            string[] font = { "Time New Roman" };            //验证码的字符集,去掉了一些容易混淆的字符             char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };            Random rnd = new Random();            //生成验证码字符串            for (int i = 0; i < 4; i++)            {                chkCode += character[rnd.Next(character.Length)];            }            //写入Session、验证码加密            //WebHelper.WriteSession("nfine_session_verifycode", Md5.md5(chkCode.ToLower(), 16));            //创建画布            Bitmap bmp = new Bitmap(codeW, codeH);            Graphics g = Graphics.FromImage(bmp);            g.Clear(Color.White);            //画噪线             for (int i = 0; i < 3; i++)            {                int x1 = rnd.Next(codeW);                int y1 = rnd.Next(codeH);                int x2 = rnd.Next(codeW);                int y2 = rnd.Next(codeH);                Color clr = color[rnd.Next(color.Length)];                g.DrawLine(new Pen(clr), x1, y1, x2, y2);            }            //画验证码字符串             for (int i = 0; i < chkCode.Length; i++)            {                string fnt = font[rnd.Next(font.Length)];                Font ft = new Font(fnt, fontSize);                Color clr = color[rnd.Next(color.Length)];                g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);            }            //将验证码图片写入内存流,并将其以 "image/Png" 格式输出             MemoryStream ms = new MemoryStream();            try            {                bmp.Save(ms, ImageFormat.Png);                return ms.ToArray();            }            catch (Exception)            {                return null;            }            finally            {                g.Dispose();                bmp.Dispose();            }        }    }}

步骤4:Controller代码:

    public ActionResult GetAuthCode()        {            return File(new Ddmo.VerifvCode().GetVerifvCode(), @"image/Gif");        }

步骤5:运行代码:
这里写图片描述

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