在一般处理程序里写一个简单验证码

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代码不多，直接粘贴了。

<%@ WebHandler Language="C#" Class="验证码" %>

using System;
using System.Web;
using System.Drawing;
public class 验证码 : IHttpHandler
{

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/jpeg";
string code = GetCode();//获得随机数
using (Image img = GetImg(code))
{
img.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);//输出
}
}

private Image GetImg(string code)
{
Bitmap bit = new Bitmap(90, 35);
using (Graphics g = Graphics.FromImage(bit))
{
g.FillRectangle(Brushes.Brown, 0, 0, bit.Width, bit.Height);
g.FillRectangle(Brushes.White, 1, 1, bit.Width - 2, bit.Height - 2);
g.DrawString(code, new Font("微软雅黑", 20), Brushes.Sienna, 3, 1);
}
return bit;
}

//生成四位验证码
private string GetCode()
{
string code = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string str = "";
Random r = new Random();
for (int i = 0; i < 4; i++)
{
int index = r.Next(0, code.Length);
str += code[index];
}
return str;
}
public bool IsReusable
{
get
{
return false;
}
}

}