asp.net mvc验证码类使用
验证码类
namespaceQJW.VerifyCode
{
//用法：
//publicFileContentResultCreateValidate()
//{
//ValidateCodevCode=newValidateCode();
//stringcode=vCode.CreateValidateCode(5);
//Session["ValidateCode"]=code;
//byte[]bytes=vCode.CreateValidateGraphic(code);
//returnFile(bytes,"image/JPEG");
//}
publicclassValidateCode
{
publicValidateCode()
{
}
///<summary>
///验证码的最大长度
///</summary>
publicintMaxLength
{
get{return10;}
}
///<summary>
///验证码的最小长度
///</summary>
publicintMinLength
{
get{return1;}
}
///<summary>
///生成验证码
///</summary>
///<paramname="length">指定验证码的长度</param>
///<returns></returns>
publicstringCreateValidateCode(intlength)
{
int[]randMembers=newint[length];
int[]validateNums=newint[length];
stringvalidateNumberStr="";
//生成起始序列值
intseekSeek=unchecked((int)DateTime.Now.Ticks);
RandomseekRand=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++)
{
Randomrand=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;
Randomrand=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;
}
///<summary>
///创建验证码的图片
///</summary>
///<paramname="containsPage">要输出到的page对象</param>
///<paramname="validateNum">验证码</param>
publicbyte[]CreateValidateGraphic(stringvalidateCode)
{
Bitmapimage=newBitmap((int)Math.Ceiling(validateCode.Length*12.0),22);
Graphicsg=Graphics.FromImage(image);
try
{
//生成随机生成器
Randomrandom=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);
}
Fontfont=newFont("Arial",12,(FontStyle.Bold|FontStyle.Italic));
LinearGradientBrushbrush=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
MemoryStreamstream=newMemoryStream();
image.Save(stream,ImageFormat.Jpeg);
//输出图片流
returnstream.ToArray();
}
finally
{
g.Dispose();
image.Dispose();
}
}
///<summary>
///得到验证码图片的长度
///</summary>
///<paramname="validateNumLength">验证码的长度</param>
///<returns></returns>
publicstaticintGetImageWidth(intvalidateNumLength)
{
return(int)(validateNumLength*12.0);
}
///<summary>
///得到验证码的高度
///</summary>
///<returns></returns>
publicstaticdoubleGetImageHeight()
{
return22.5;
}
}
}
使用方法
publicFileContentResultCreateValidate()
{
ValidateCodevCode=newValidateCode();
stringcode=vCode.CreateValidateCode(5);
Session["ValidateCode"]=code;
byte[]bytes=vCode.CreateValidateGraphic(code);
returnFile(bytes,"image/JPEG");
}
HTML
<ahref="javascript:;"onclick="reloadcode();"><imgid="safecode"src="/common/CreateValidate"alt=""/></a>
视图JS
functionreloadcode(){
varverify=document.getElementById('safecode');
verify.setAttribute('src','/common/CreateValidate?'+Math.random());
}
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