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asp.net mvc验证码类怎么用 mvc验证码类使用教程
时间：2016-12-30 编辑：简简单单 来源：一聚教程网
验证码类
| 代码如下 | 复制代码 |
| namespaceQJW.VerifyCode
{
//用法：
//public FileContentResult CreateValidate()
//{
// ValidateCode vCode = new ValidateCode();
// string code = vCode.CreateValidateCode(5);
// Session["ValidateCode"] = code;
// byte[] bytes = vCode.CreateValidateGraphic(code);
// return File(bytes, "image/JPEG");
//}
publicclassValidateCode
{
publicValidateCode()
{
}
///
/// 验证码的最大长度
///
publicintMaxLength
{
get{return10; }
}
///
/// 验证码的最小长度
///
publicintMinLength
{
get{return1; }
}
///
/// 生成验证码
///
/// 指定验证码的长度
///
publicstringCreateValidateCode(intlength)
{
int[] randMembers =newint[length];
int[] validateNums =newint[length];
stringvalidateNumberStr ="";
//生成起始序列值
intseekSeek =unchecked((int)DateTime.Now.Ticks);
Random seekRand =newRandom(seekSeek);
intbeginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
int[] seeks =newint[length];
for(inti = 0; i < length; i++)
{
beginSeek += 10000;
seeks[i] = beginSeek;
}
//生成随机数字
for(inti = 0; i < length; i++)
{
Random rand =newRandom(seeks[i]);
intpownum = 1 * (int)Math.Pow(10, length);
randMembers[i] = rand.Next(pownum, Int32.MaxValue);
}
//抽取随机数字
for(inti = 0; i < length; i++)
{
stringnumStr = randMembers[i].ToString();
intnumLength = numStr.Length;
Random rand =newRandom();
intnumPosition = rand.Next(0, numLength - 1);
validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
}
//生成验证码
for(inti = 0; i < length; i++)
{
validateNumberStr += validateNums[i].ToString();
}
returnvalidateNumberStr;
}
///
/// 创建验证码的图片
///
/// 要输出到的page对象
/// 验证码
publicbyte[] CreateValidateGraphic(stringvalidateCode)
{
Bitmap image =newBitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random =newRandom();
//清空图片背景色
g.Clear(Color.White);
//画图片的干扰线
for(inti = 0; i < 25; i++)
{
intx1 = random.Next(image.Width);
intx2 = random.Next(image.Width);
inty1 = random.Next(image.Height);
inty2 = random.Next(image.Height);
g.DrawLine(newPen(Color.Silver), x1, y1, x2, y2);
}
Font font =newFont("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush =newLinearGradientBrush(newRectangle(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(inti = 0; i < 100; i++)
{
intx = random.Next(image.Width);
inty = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(newPen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//保存图片数据
MemoryStream stream =newMemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片流
returnstream.ToArray();
}
finally
{
g.Dispose();
image.Dispose();
}
}
///
/// 得到验证码图片的长度
///
/// 验证码的长度
///
publicstaticintGetImageWidth(intvalidateNumLength)
{
return(int)(validateNumLength * 12.0);
}
///
/// 得到验证码的高度
///
///
publicstaticdoubleGetImageHeight()
{
return22.5;
}
}
}
| |
使用方法
| 代码如下 | 复制代码 |
|
publicFileContentResult CreateValidate()
{
ValidateCode vCode =newValidateCode();
stringcode = vCode.CreateValidateCode(5);
Session["ValidateCode"] = code;
byte[] bytes = vCode.CreateValidateGraphic(code);
returnFile(bytes,"image/JPEG");
}
| |
HTML
| 代码如下 | 复制代码 |
| javascript:;" onclick="reloadcode();"> | |
视图JS
| 代码如下 | 复制代码 |
|
functionreloadcode() {
varverify = document.getElementById('safecode');
verify.setAttribute('src','/common/CreateValidate?'+ Math.random());
}
| |
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