MVC之图片验证码

MVC之图片验证码

controller中的action方法
public ActionResult GetValidateCode()
        { 
            ValidateCode vCode = new ValidateCode();
            string code = vCode.CreateValidateCode(5);
            Session["ValidateCode"] = code;
            byte[] bytes = vCode.CreateValidateGraphic(code);
            return File(bytes, @"image/jpeg");
        }
view中的代码
验证码：<img src="/Auth/GetValidateCode" alt="验证码" id="loginCodeImg" />
<script type="text/javascript">
        $("#loginCodeImg").click(function () {
this.src = "../Auth/GetValidatecode?time=" + (new Date()).getTime();
        }); 
</script>

ValidateCode类

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web.UI;
using System.Drawing.Drawing2D;
using System.IO;

namespace SeniOA.MVC
{
/// <summary>
/// 生成验证码的类
/// </summary>
public class ValidateCode
    {
public ValidateCode()
        {
        }
/// <summary>
/// 验证码的最大长度
/// </summary>
public int MaxLength
        {
get { return 10; }
        }
/// <summary>
/// 验证码的最小长度
/// </summary>
public int MinLength
        {
get { return 1; }
        }
/// <summary>
/// 生成验证码
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <returns></returns>
public string CreateValidateCode(int length)
        {
int[] randMembers = new int[length];
int[] validateNums = new int[length];
string validateNumberStr = "";
//生成起始序列值
int seekSeek = unchecked((int)DateTime.Now.Ticks);
            Random seekRand = new Random(seekSeek);
int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
int[] seeks = new int[length];
for (int i = 0; i < length; i++)
            {
                beginSeek += 10000;
                seeks[i] = beginSeek;
            }
//生成随机数字
for (int i = 0; i < length; i++)
            {
                Random rand = new Random(seeks[i]);
int pownum = 1 * (int)Math.Pow(10, length);
                randMembers[i] = rand.Next(pownum, Int32.MaxValue);
            }
//抽取随机数字
for (int i = 0; i < length; i++)
            {
string numStr = randMembers[i].ToString();
int numLength = numStr.Length;
                Random rand = new Random();
int numPosition = rand.Next(0, numLength - 1);
                validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
            }
//生成验证码
for (int i = 0; i < length; i++)
            {
                validateNumberStr += validateNums[i].ToString();
            }
return validateNumberStr;
        }

/// <summary>
/// 得到验证码图片的长度
/// </summary>
/// <param name="validateNumLength">验证码的长度</param>
/// <returns></returns>
public static int GetImageWidth(int validateNumLength)
        {
return (int)(validateNumLength * 12.0);
        }
/// <summary>
/// 得到验证码的高度
/// </summary>
/// <returns></returns>
public static double GetImageHeight()
        {
return 22.5;
        }
/// <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 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();
            }
        }
    }
}

 

 

 @Html.TextBox("code", "", new { @class = "textBox yzCode", placeholder = "验证码", id = "loginCode", onblur = "validateLoginCode(loginCode);" })
                            <img src="/Auth/GetValidateCode" alt="验证码" id="loginCodeImg" />