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>
