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C# 验证码
using System;using System.Collections;using System.Data;using System.Linq;using System.Web;using System.Web.Services;using System.Web.Services.Protocols;using System.Xml.Linq;using System.Drawing;using System.Web.SessionState;namespace MT{ /// <summary> /// $codebehindclassname$ 的摘要说明 /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class verCode : IHttpHandler, IRequiresSessionState { private Random RandomSeed = new Random(); public void ProcessRequest(HttpContext context) { // 生成随机数 iIlLoO0 string strWord = "23456789QWERTYUPASDFGHKXCVBNM"; string NumStr = null; for (int i = 0; i < 5; i++) { NumStr += strWord[RandomSeed.Next(0, strWord.Length)]; } //将验证码保存到session中 context.Session["vcode"] = NumStr.ToLower(); CreateImages(context, NumStr); } #region 生成验证码图片 private void CreateImages(HttpContext context,string checkCode) { int iwidth = (int)(checkCode.Length * 13); System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 22); Graphics g = Graphics.FromImage(image); 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 }; //定义字体 string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" }; Random rand = new Random(); //随机输出噪点 for (int i = 0; i < 50; i++) { int x = rand.Next(image.Width); int y = rand.Next(image.Height); g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1); } //输出不同字体和颜色的验证码字符 for (int i = 0; i < checkCode.Length; i++) { int cindex = rand.Next(7); int findex = rand.Next(5); Font f = new System.Drawing.Font(font[findex], 10, System.Drawing.FontStyle.Bold); Brush b = new System.Drawing.SolidBrush(c[cindex]); int ii = 4; if ((i + 1) % 2 == 0) { ii = 2; } g.DrawString(checkCode.Substring(i, 1), f, b, 2 + (i * 12), ii); } //画一个边框 g.DrawRectangle(new Pen(ColorTranslator.FromHtml("#CCCCCC"), 0), 0, 0, image.Width - 1, image.Height - 1); //输出到浏览器 System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); context.Response.ClearContent(); //Response.ClearContent(); context.Response.ContentType = "image/gif"; context.Response.BinaryWrite(ms.ToArray()); g.Dispose(); image.Dispose(); } #endregion public bool IsReusable { get { return false; } } }}
C# 验证码
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