mvc验证码

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 <</span> length; i++)

{

beginSeek += 10000;

seeks[i] = beginSeek;

}

//生成随机数字

for (int i = 0; i <</span> 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 <</span> 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 <</span> length; i++)

{

validateNumberStr += validateNums[i].ToString();

}

return validateNumberStr;

}

///

/// 生成验证码

///

/// 指定验证码的长度

///

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 <</span> length; i++)

{

beginSeek += 10000;

seeks[i] = beginSeek;

}

//生成随机数字

for (int i = 0; i <</span> 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 <</span> 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 <</span> length; i++)

{

validateNumberStr += validateNums[i].ToString();

}

return validateNumberStr;

}

///

/// 创建验证码的图片

///

/// 要输出到的page对象

/// 验证码

public void 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 <</span> 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 <</span> 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

containsPage.Response.Clear();

containsPage.Response.ContentType = "image/jpeg";

containsPage.Response.BinaryWrite(stream.ToArray());

}

finally

{

g.Dispose();

image.Dispose();

}

///

/// 得到验证码图片的长度

///

/// 验证码的长度

///

public static int GetImageWidth(int validateNumLength)

{

return (int)(validateNumLength * 12.0);

}

///

/// 得到验证码的高度

///

public static double GetImageHeight()

{

return 22.5;

}

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");

}

<head>    <meta name="viewport" content="width=device-width" />
    <title>登陆页</title>
    <link href="~/Content/css/Login.css" rel="stylesheet" />
    <script src="~/Scripts/jquery-1.10.2.js"></script>
    <script type="text/javascript">

        function changeCheckCode() {
            $("#img").attr("src", $("#img").attr("src") + 1); //id=2
        }

    </script>
</head>
<body>

    <div id="loginDiv">
        <p id="loginP">登陆</p>
        <input type="text" id="userName" placeholder="用户名" /><br />
        <input type="password" id="password" placeholder="密码" /><br />
        <input type="text" id="checkCode" placeholder="验证码" />
        <img id="img" src="/UserInfo/ShowValidateCode/?id=1" />
        <a href="javascript:void(0)" onclick="changeCheckCode();return false;">看不清，换一张</a><br />
        <button id="btnLogin">登陆</button><button id="btnEsc">取消</button>

    </div>
</body>
</html>

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mvc验证码

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