一个简单的ASP.NET验证码

2024-02-19 18:07:05 48

///

///验证码生成类 ///

publicclassverify_code:IHttpHandler,IRequiresSessionState { publicvoidProcessRequest(HttpContextcontext) { intcodeW=80; intcodeH=22; intfontSize=16; stringchkCode=string.Empty; //颜色列表，用于验证码、噪线、噪点 Color[]color={Color.Black,Color.Red,Color.Blue,Color.Green,Color.Orange,Color.Brown,Color.Brown,Color.DarkBlue}; //字体列表，用于验证码 string[]font={"TimesNewRoman","Verdana","Arial","Gungsuh","Impact"}; //验证码的字符集，去掉了一些容易混淆的字符 char[]character={'0','1','2','3','4','5','6','8','9'}; Randomrnd=newRandom(); //生成验证码字符串 for(inti=0;i<4;i++) { chkCode+=character[rnd.Next(character.Length)]; } //写入Session context.Session["sys_verify_code"]=chkCode; //创建画布 Bitmapbmp=newBitmap(codeW,codeH); Graphicsg=Graphics.FromImage(bmp); g.Clear(Color.White); //画噪线 for(inti=0;i<4;i++) { intx1=rnd.Next(codeW); inty1=rnd.Next(codeH); intx2=rnd.Next(codeW); inty2=rnd.Next(codeH); Colorclr=color[rnd.Next(color.Length)]; g.DrawLine(newPen(clr),x1,y1,x2,y2); } //画验证码字符串 for(inti=0;i

基本验证生成代码demo：

usingSystem;
usingSystem.Drawing;
usingSystem.Drawing.Imaging;
usingSystem.IO;
usingSystem.Web;

publicpartialclassimage:System.Web.UI.Page
{
protectedvoidPage_Load(objectsender,EventArgse)
{
stringtmp=RndNum(4);
HttpCookiea=newHttpCookie("ImageV",tmp);
Response.Cookies.Add(a);
this.ValidateCode(tmp);
}

privatevoidValidateCode(stringVNum)
{
BitmapImg=null;
Graphicsg=null;
MemoryStreamms=null;
intgheight=VNum.Length*12;
Img=newBitmap(gheight,25);
g=Graphics.FromImage(Img);
//背景颜色
g.Clear(Color.White);
//文字字体
Fontf=newFont("ArialBlack",10);
//文字颜色
SolidBrushs=newSolidBrush(Color.Black);
g.DrawString(VNum,f,s,3,3);
ms=newMemoryStream();
Img.Save(ms,ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType="image/Jpeg";
Response.BinaryWrite(ms.ToArray());

g.Dispose();
Img.Dispose();
Response.End();
}

privatestringRndNum(intVcodeNum)
{
stringVchar="0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p"+
",q,r,s,t,u,v,w,x,y,z";
string[]VcArray=Vchar.Split(newChar[]{','});
stringVNum="";
inttemp=-1;

Randomrand=newRandom();

for(inti=1;i
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

一个简单的ASP.NET验证码

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