asp.net生成验证码代码（纯中文）

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Text; //添加引用 using System.Drawing; //添加引用 /// <summary> /// CheckCode_Ch 的摘要说明 /// </summary> public class CheckCode_Ch { public CheckCode_Ch() { // // TODO: 在此处添加构造函数逻辑 // } private static object[] CreateString() { //定义一个数组存储汉字编码的组成元素 string[] str = new string[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; Random ran = new Random(); //定义一个随机数对象 object[] bytes = new object[4]; for (int i = 0; i < 4; i++) { //获取区位码第一位 int ran1 = ran.Next(11, 14); string str1 = str[ran1].Trim(); //获取区位码第二位并防止数据重复 ran = new Random(ran1 * unchecked((int)DateTime.Now.Ticks) + i); int ran2; if (ran1 == 13) { ran2 = ran.Next(0, 7); } else { ran2 = ran.Next(0, 16); } string str2 = str[ran2].Trim(); //获取区位码第三位 ran = new Random(ran2 * unchecked((int)DateTime.Now.Ticks) + i); int ran3 = ran.Next(10, 16); string str3 = str[ran3].Trim(); //获取区位码第四位 ran = new Random(ran3 * unchecked((int)DateTime.Now.Ticks) + i); int ran4; if (ran3 == 10) { ran4 = ran.Next(1, 16); } else if (ran3 == 15) { ran4 = ran.Next(0, 15); } else { ran4 = ran.Next(0, 16); } string str4 = str[ran4].Trim(); //定义字节变量存储产生的随机汉字区位码 byte byte1 = Convert.ToByte(str1 + str2, 16); byte byte2 = Convert.ToByte(str3 + str4, 16); byte[] stradd = new byte[] { byte1, byte2 }; //将产生的汉字字节放入数组 bytes.SetValue(stradd, i); } return bytes; } private static string GetString() { Encoding gb = Encoding.GetEncoding("gb2312"); object[] bytes = CreateString(); //根据汉字字节解码出中文汉字 string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[]))); string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); string str = str1 + str2 + str3 + str4; HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", str)); return str; } public static void GraphicsImage() { System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((GetString().Length * 22.5)), 22); Graphics g = Graphics.FromImage(image); //创建画布 try { //生成随机生成器 Random random = new Random(); //清空图片背景色 g.Clear(Color.White); //画图片的背景噪音线 for (int i = 0; i < 1; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 =<a>本文来源gao($daima.com搞@代@#码8网^</a> random.Next(image.Height); g.DrawLine(new Pen(Color.Black), x1, y1, x2, y2); } Font font = new System.Drawing.Font("Couriew New", 12, System.Drawing.FontStyle.Bold); System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush (new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(GetString(), font, brush, 2, 2); //画图片的前景噪音点 for (int i = 0; i < 50; i++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); HttpContext.Current.Response.ClearContent(); HttpContext.Current.Response.ContentType = "image/Gif"; HttpContext.Current.Response.BinaryWrite(ms.ToArray()); } catch (Exception ms) { HttpContext.Current.Response.Write(ms.Message); } } }

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