ASP.Net一般处理程序生成动态验证码

using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Imaging;using System.Linq;using System.Web;namespace 动态验证码生成{ ???/// <summary> ???/// Handler1 的摘要说明 ???/// </summary> ???public class Handler1 : IHttpHandler ???{ ???????public void ProcessRequest(HttpContext context) ???????{ ???????????context.Response.ContentType = "image/jpeg"; ???????????????????????var bmp = GetVerCode(); ???????????bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg); ???????????//context.Response.Write("Hello World"); ???????} ???????/// <summary> ???????/// 生成验证码 ???????/// </summary> ???????/// <returns></returns> ???????private static Bitmap GetVerCode() ???????{ ???????????Random r = new Random(); ???????????string str = null; ???????????for (int i = 0; i < 4; i++) ???????????{ ???????????????int rNumber = r.Next(0, 10); ???????????????str += rNumber; ???????????} ???????????//创建GDI对象 ???????????Bitmap bmp = new Bitmap(100, 40); ???????????Graphics g = Graphics.FromImage(bmp); ???????????for (int i = 0; i < 4; i++) ???????????{ ???????????????Point p = new Point(i * 20, 0); ???????????????string[] fonts = {"微软雅黑", "宋体", "黑体", "隶书"}; ???????????????Color[] colors = {Color.Yellow, Color.Blue, Color.Black, Color.Red, Color.Green}; ???????????????g.DrawString(str[i].ToString(), new Font(fonts[r.Next(0, 4)], 20, FontStyle.Bold), ???????????????????new SolidBrush(colors[r.Next(0, 4)]), p); ???????????} ???????????for (int i = 0; i < 20; i++) ???????????{ ???????????????Point p1 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height)); ???????????????Point p2 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height)); ???????????????g.DrawLine(new Pen(Brushes.Green), p1, p2); ???????????} ???????????for (int i = 0; i < 500; i++) ???????????{ ???????????????Point p = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height)); ???????????????bmp.SetPixel(p.X, p.Y, Color.Black); ???????????} ???????????return bmp; ???????} ???????public bool IsReusable ???????{ ???????????get ???????????{ ???????????????return false; ???????????} ???????} ???}}