asp.net登录验证码实现方法
前端添加的标签和方法：
验证码：
<inputid="txtVerifyCode"type="text"maxlength="5"style="line-height:30px; height:30px;width:80px;border:solid1px#d4d4d4;"class="input"/> <imgsrc=""alt="点击刷新"id="imgValidateCode"style="width:100px;height:30px;line-height:30px;vertical-align:middle;"/> 点击图片刷新</p>//标签
$(function(){
$("#imgValidateCode").click(function(){
DoFresh();
});
DoFresh();
})
functionDoFresh(){
varimg=$("#imgValidateCode");
img.attr("src","VerifyCode.aspx?random="+Math.random());
}//添加的方法，src是生成图片的aspx的地址
然后在项目中在新建一个VerifyCode.aspx，下面是aspx的代码：
<%@PageLanguage="C#"AutoEventWireup="true"CodeBehind="VerifyCode.aspx.cs"Inherits="Form.VerifyCode"%> <!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <htmlxmlns="http://www.w3.org/1999/xhtml"> <headid="Head1"runat="server"> <title></title> </head> <body> <formid="form1"runat="server"> <div> </div> </form> </body> </html>
接着是aspx.cs的代码：
usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Web;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Drawing;
namespaceForm
{
publicpartialclassVerifyCode:System.Web.UI.Page
{
publicstaticstringHZ;
///<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;}
}
protectedvoidPage_Load(objectsender,EventArgse)
{
string[]str=CreateValidateNumber(4);
stringstrcode=string.Empty;
for(inti=0;i<str.Length;i++)
{
strcode+=str[i];
}
CreateCheckCodeImage(str);
HZ=strcode;
Response.Write(HZ);
//验证码存入session
Session["ValidateCode"]=HZ;
}
///<summary>
///生成验证码
///</summary>
///<paramname="length">指定验证码的长度</param>
///<returns>验证码</returns>
publicstring[]CreateValidateNumber(intlength)
{
stringVchar="1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,p"+
",q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,P,Q"+
",R,S,T,U,V,W,X,Y,Z";
string[]VcArray=Vchar.Split(newChar[]{','});//拆分成数组
string[]num=newstring[length];
inttemp=-1;//记录上次随机数值，尽量避避免生产几个一样的随机数
Randomrand=newRandom();
//采用一个简单的算法以保证生成随机数的不同
for(inti=1;i<length+1;i++)
{
if(temp!=-1)
{
rand=newRandom(i*temp*unchecked((int)DateTime.Now.Ticks));
}
intt=rand.Next(VcArray.Length-1);
if(temp!=-1&&temp==t)
{
returnCreateValidateNumber(length);
}
temp=t;
num[i-1]=VcArray[t];
//num.SetValue(VcArray[t]);
//VNum+=VcArray[t];
}
returnnum;
}
privatevoidCreateCheckCodeImage(string[]checkCode)
{
if(checkCode==null||checkCode.Length<=0)
return;
System.Drawing.Bitmapimage=newSystem.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length*32.5)),60);
System.Drawing.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);
//定义颜色
Color[]c={Color.Black,Color.Red,Color.DarkBlue,Color.Green,Color.Orange,Color.Brown,Color.DarkCyan,Color.Purple};
//画图片的背景噪音线
for(inti=0;i<25;i++)
{
intcindex=random.Next(7);
intfindex=random.Next(5);
intx1=random.Next(image.Width);
intx2=random.Next(image.Width);
inty1=random.Next(image.Height);
inty2=random.Next(image.Height);
//g.DrawLine(newPen(c[cindex]),x1,y1,x2,y2);
}
//定义字体
string[]f={"Verdana","MicrosoftSansSerif","ComicSansMS","Arial","宋体"};
for(intk=0;k<=checkCode.Length-1;k++)
{
intcindex=random.Next(7);
intfindex=random.Next(5);
FontdrawFont=newFont(f[findex],26,(System.Drawing.FontStyle.Bold));
SolidBrushdrawBrush=newSolidBrush(c[cindex]);
floatx=5.0F;
floaty=0.0F;
floatwidth=42.0F;
floatheight=48.0F;
intsjx=random.Next(10);
intsjy=random.Next(image.Height-(int)height);
RectangleFdrawRect=newRectangleF(x+sjx+(k*25),y+sjy,width,height);
StringFormatdrawFormat=newStringFormat();
drawFormat.Alignment=StringAlignment.Center;
g.DrawString(checkCode[k],drawFont,drawBrush,drawRect,drawFormat);
}
//画图片的前景噪音点
for(inti=0;i<500;i++)
{
intx=random.Next(image.Width);
inty=random.Next(image.Height);
image.SetPixel(x,y,Color.FromArgb(random.Next()));
}
intcindex1=random.Next(7);
//画图片的边框线
g.DrawRectangle(newPen(c[cindex1]),0,0,image.Width-1,image.Height-1);
System.IO.MemoryStreamms=newSystem.IO.MemoryStream();
image.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType="image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
}
于是！就可以生成验证码了，然后自己再把编写验证版的判断逻辑写好就可以啦！
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。