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ASP.NET MVC驗(yàn)證碼功能實(shí)現(xiàn)代碼

更新時(shí)間：2013年06月07日 11:04:33 作者：

ASP.NET MVC驗(yàn)證碼功能實(shí)現(xiàn)代碼，需要的朋友可以參考一下

前臺(tái)

<img id="vcodeimg" src="/Home/VCode" width="70"
                                    height="25" />
                                &nbsp;<span
                                    style="cursor: pointer; text-decoration: underline">換一張</span>

控制器

復(fù)制代碼代碼如下:

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 驗(yàn)證碼
        [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
    }
}

驗(yàn)證碼類(lèi)

復(fù)制代碼代碼如下:

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>
    /// 完美隨機(jī)驗(yàn)證碼 0.10
    /// Verion:0.10
    /// Description:隨機(jī)生成設(shè)定驗(yàn)證碼，并隨機(jī)旋轉(zhuǎn)一定角度，字體顏色不同
    /// </summary>
    public class ValidateCode
    {

        /// <summary>
        /// 生成隨機(jī)碼
        /// </summary>
        /// <param name="length">隨機(jī)碼個(gè)數(shù)www.52mvc.com</param>
        /// <returns></returns>
        public static string CreateRandomCode(int length)
        {
            int rand;
            char code;
            string randomcode = String.Empty;
            //生成一定長(zhǎng)度的驗(yàn)證碼
            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>
        /// 創(chuàng)建隨機(jī)碼圖片
        /// </summary>
        /// <param name="randomcode">隨機(jī)碼</param>
        public static void CreateImage(string randomcode)
        {
            int randAngle = 45; //隨機(jī)轉(zhuǎn)動(dòng)角度
            int mapwidth = (int)(randomcode.Length * 23);
            Bitmap map = new Bitmap(mapwidth, 28);//創(chuàng)建圖片背景
            Graphics graph = Graphics.FromImage(map);
            graph.Clear(Color.AliceBlue);//清除畫(huà)面，填充背景
            graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, map.Width - 1, map.Height - 1);//畫(huà)一個(gè)邊框
            //graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式
            Random rand = new Random();
            //背景噪點(diǎn)生成    www.dbjr.com.cn
            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);
            }
            //驗(yàn)證碼旋轉(zhuǎn)，防止機(jī)器識(shí)別
            char[] chars = randomcode.ToCharArray();//拆散字符串成單字符數(shù)組
            //文字距中
            StringFormat format = new StringFormat(StringFormatFlags.NoClip);
            format.Alignment = StringAlignment.Center;
            format.LineAlignment = StringAlignment.Center;
            //定義顏色
            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            //定義字體
            string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋體" };
            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);//字體樣式(參數(shù)2為字體大小)
                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);//測(cè)試X坐標(biāo)顯示間距的
                float angle = rand.Next(-randAngle, randAngle);//轉(zhuǎn)動(dòng)的度數(shù)
                graph.TranslateTransform(dot.X, dot.Y);//移動(dòng)光標(biāo)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);//轉(zhuǎn)回去
                graph.TranslateTransform(2, -dot.Y);//移動(dòng)光標(biāo)到指定位置
            }
            //graph.DrawString(randomcode,fontstyle,new SolidBrush(Color.Blue),2,2); //標(biāo)準(zhǔn)隨機(jī)碼
            //生成圖片
            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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