Software Development DotNet ASP.NET - 7、用注册码防止暴力注册
Created at 2013-01-07
Updated at 2018-05-03
Category
Software Development
Tag
DotNet
/
Software Development
/
ASP.NET
1、新建一个一般处理程序 ashx，在一般处理程序中使用Session，要为其实现的如下接口
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| System.Web.SessionState.IRequiresSessionState
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2、一般处理程序的任务有两个，代码如下：
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| content.Response.ContentType="image/JPEG";
using(System.Drawing.Bitmap bitmap=new System.Drawing.Bitmap(100,50))
{
using(System.Drawing.Graphics g=System.Drawing.Graphics(bitmap))
{
using(Font font=new System.Drawing.Font("宋体",12))
{
using(PointF point=new System.Drawing.PointF(0,10))
{
Random rand=new Random();
int code=rand.Next(1000,9999);
string strCode=code.ToString();
HttpContext.Current.Session["Code"]=strCode;
g.DrawString(strCode,font,System.Drawing.Brush.Green,point);
bitmap.Save(content.Response.OutputStream,System.Drawing.Image.ImageFormat.Jpeg);
}
}
}
}
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3、CS中的代码如下：
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| string Code=Convert.ToString(Session["Code"]);
if(code==TextBox1.Text)
{
Response.Write("验证码输入正确!");
}
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4、点击刷新
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| <img src="YZM.ashx" onclick="this.src='YZM.ashx?aaa='+new Date()" />
|
