using System;using System.Web;using System.Drawing.Drawing2D;using System.Text;using System.Drawing.Imaging;using System.Drawing;using System.Web.SessionState;namespace B_Mana{ /// <summary> /// validationCode 的摘要说明 使用方法:validationCode.ashx?len=4&type=3 len长度 type:0纯数字;1纯字母;2数字与字母混合;3纯汉字 /// </summary> public class validationCode : IHttpHandler,IRequiresSessionState { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; int clen = 4, ctype = 0; try { clen = Convert.ToInt16(context.Request["Len"].ToString().Trim()); ctype = Convert.ToInt16(context.Request["Type"].ToString().Trim()); } catch { } string checkcokestr = CreateCheckCode(clen, ctype); context.Session["CheckStr"] = checkcokestr; } public bool IsReusable { get { return false; } } /// <summary> /// 创建验证码,返回验证码字符串 /// </summary> /// <param name="CodeLen">int CodeLe:验证码长度</param> /// <param name="CodeType">int CodeType:0纯数字;1纯字母;2数字与字母混合;3纯汉字</param> /// <returns></returns> /// private string CreateCheckCode(int CodeLen, int CodeType) { /**参数说明：CodeLen(验证码长度）;CodeType(0纯数字，1纯字母,2,数字与字母混合，3,纯汉字)**/ if (CodeType > 3) { CodeType = 3; } string codestring = ""; //定义验证图片的长度与宽度 int Clen = 30 * CodeLen, Cheight = 40; //定义验证图片的背景颜色 Color CBcolor = Color.FromArgb(244, 244, 244); string[] font = { "Bell MT", "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体", "幼圆", "楷体_GB2312", "仿宋_GB2312" }; Font Cfont = new Font("Arial", 25, FontStyle.Bold); //产生随机验证码--------------------------------------------------------------------------------------------------- switch (CodeType) { //纯数字 case 0: Random random1 = new Random(); codestring = random1.Next((int)System.Math.Pow(10, CodeLen - 1), (int)System.Math.Pow(10, CodeLen) - 1).ToString(); break; //纯数字 //纯字母 case 1: string Vchar1 = "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z"; String[] VcArray1 = Vchar1.Split(','); int vclen1 = VcArray1.Length; int vcindex1; Random random2 = new Random(); for (int i = 0; i < CodeLen; i++) { vcindex1 = random2.Next(vclen1); codestring = codestring + VcArray1[vcindex1]; } break; case 2: string Vchar2 = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z,0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z"; String[] VcArray2 = Vchar2.Split(','); int vclen2 = VcArray2.Length; int vcindex2; Random random3 = new Random(); for (int i = 0; i < CodeLen; i++) { vcindex2 = random3.Next(vclen2); codestring = codestring + VcArray2[vcindex2]; } break; //纯字母 //纯汉字 case 3: //定义一个字符串数组储存汉字编码的组成元素 string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; Random rnd = new Random(); int strlength = CodeLen * 2; //定义一个object数组用来 object[] bytes = new object[strlength]; /**/ /*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中 每个汉字有四个区位码组成 区位码第1位和区位码第2位作为字节数组第一个元素 区位码第3位和区位码第4位作为字节数组第二个元素 */ for (int i = 0; i < strlength; i++) { //区位码第1位 int r1 = rnd.Next(11, 14); string str_r1 = rBase[r1].Trim(); //区位码第2位 rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的种子避免产生重复值 int r2; if (r1 == 13) { r2 = rnd.Next(0, 7); } else { r2 = rnd.Next(0, 16); } string str_r2 = rBase[r2].Trim(); //区位码第3位 rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i); int r3 = rnd.Next(10, 16); string str_r3 = rBase[r3].Trim(); //区位码第4位 rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i); int r4; if (r3 == 10) { r4 = rnd.Next(1, 16); } else if (r3 == 15) { r4 = rnd.Next(0, 15); } else { r4 = rnd.Next(0, 16); } string str_r4 = rBase[r4].Trim(); //定义两个字节变量存储产生的随机汉字区位码 byte byte1 = Convert.ToByte(str_r1 + str_r2, 16); byte byte2 = Convert.ToByte(str_r3 + str_r4, 16); //将两个字节变量存储在字节数组中 byte[] str_r = new byte[] { byte1, byte2 }; //将产生的一个汉字的字节数组放入object数组中 bytes.SetValue(str_r, i); } Encoding gb = Encoding.GetEncoding("gb2312"); //根据汉字编码的字节数组解码出中文汉字 for (int i = 0; i < strlength / 2; i++) { codestring = codestring + gb.GetString((byte[])Convert.ChangeType(bytes[i], typeof(byte[]))); } break; //纯汉字 } //显示验证码----------------------------------------------------------------------------------------------------- //创建一个图像 //定义画笔，用于绘制文字 Brush brush1 = new SolidBrush(Color.Black); Bitmap bitmap1 = new System.Drawing.Bitmap(Clen, Cheight); //从图像获取一个绘画面 Graphics graphics1 = Graphics.FromImage(bitmap1); //清除整个绘图画面并用颜色填充 graphics1.Clear(CBcolor); PointF Cpoint1 = new PointF(5, 5); Random rnd1 = new Random(); int x1 = 0, y1 = 0; //绘制边框 graphics1.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap1.Width - 1, bitmap1.Height - 1); //绘制文字 for (int i = 0; i < codestring.Length; i++) { //随机字符位置 x1 = rnd1.Next(10) + 25 * i; y1 = rnd1.Next(bitmap1.Height / 4); Cpoint1 = new PointF(x1, y1); //随机字符颜色,应根据背景作适当调整以免显示模糊不清 brush1 = new SolidBrush(Color.FromArgb(rnd1.Next(100), rnd1.Next(100), rnd1.Next(100))); Cfont = new Font(font[rnd1.Next(font.Length - 1)], 16, FontStyle.Bold); //随机倾斜字符 graphics1.TranslateTransform(10, 0); Matrix transform = graphics1.Transform; transform.Shear(Convert.ToSingle(rnd1.NextDouble() - 0.5), 0.001f); graphics1.Transform = transform; graphics1.DrawString(codestring.Substring(i, 1), Cfont, brush1, Cpoint1); graphics1.ResetTransform(); } //绘制干扰点 rnd1 = new Random(); for (int i = 0; i < 50 * CodeLen; i++) { //随机干扰位置 x1 = rnd1.Next(bitmap1.Width); y1 = rnd1.Next(bitmap1.Height); bitmap1.SetPixel(x1, y1, Color.FromArgb(rnd1.Next(50), rnd1.Next(50), rnd1.Next(50))); } //绘制干扰线 rnd1 = new Random(); for (int i = 0; i < 10; i++) { //随机干扰位置 x1 = rnd1.Next(bitmap1.Width); y1 = rnd1.Next(bitmap1.Height); int x2 = rnd1.Next(bitmap1.Width); int y2 = rnd1.Next(bitmap1.Height); //随机干扰线颜色 Pen pen1 = new Pen(Color.FromArgb(rnd1.Next(100, 255), rnd1.Next(100, 255), rnd1.Next(100, 255))); graphics1.DrawLine(pen1, x1, y1, x2, y2); } bitmap1.Save(HttpContext.Current.Response.OutputStream, ImageFormat.Jpeg); bitmap1.Dispose(); graphics1.Dispose(); return codestring; } }}
