asp.net-mvc验证码 asp.net-mvc c#验证码

验证码看不清换一组

写一个类

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>

/// 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();

}

}

/// <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;

}

}

然后在controller中写到

public ActionResult GetValidateCode()

{

MyEbook.Models.ValidateCode vCode =new MyEbook.Models.ValidateCode ();

string code = vCode.CreateValidateCode(5);

Session["ValidateCode"] = code;

byte[] bytes = vCode.CreateValidateGraphic(code);

return File(bytes, @"image/jpeg");

}

然后在view中页面调用

<img id="imgCode" src="../MyEbook/GetValidateCode" style="cursor: pointer; vertical-align: middle" alt="ValidateCode" />

最后单击无刷新更换验证码(使用jquery)

$("#imgCode").click(function() { this.src = "../MyEbook/GetValidateCode?time" + new Date().getTime(); });//后面一定new一个date不然不会进行换组

验证码同步(防止第一次打开页面时不显示session验证码)

 

   首先

      在actionresult中写一个

public ActionResult GetJsonData()//get data(获取数据)

{

return this.Json(Session["ValidateCode"]);

}

   然后

在页面中写点击验证码图片的事件

$.ajax({url:”GetJsonData”,type:”post”,dataType:”json”,success:showResult})

function showResult(result) { $("#hCode").val(result.toString()); };

即可第一次加载时session有值