本文實例為大家分享了ASP.NET驗證碼的具體代碼，供大家參考，具體內容如下
我主要是看到干擾線了，一個驗證碼里面要是沒有干擾線什么的，至少得在噪點和隨機碼的排版上下工夫：
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/// <summary>/// 驗證碼生成類/// </summary>public class verify_code : IHttpHandler, IRequiresSessionState{ public void ProcessRequest(HttpContext context) { int codeW = 80; int codeH = 22; int fontSize = 16; string chkCode = string.Empty; //顏色列表，用于驗證碼、噪線、噪點 Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue }; //字體列表，用于驗證碼 string[] font = { "Times New Roman", "Verdana", "Arial", "Gungsuh", "Impact" }; //驗證碼的字符集，去掉了一些容易混淆的字符 char[] character = { '0', '1', '2', '3', '4', '5', '6', '8', '9' }; Random rnd = new Random(); //生成驗證碼字符串 for (int i = 0; i < 4; i++) { chkCode += character[rnd.Next(character.Length)]; } //寫入Session context.Session["sys_verify_code"] = chkCode; //創建畫布 Bitmap bmp = new Bitmap(codeW, codeH); Graphics g = Graphics.FromImage(bmp); g.Clear(Color.White); //畫噪線 for (int i = 0; i < 4; i++) { int x1 = rnd.Next(codeW); int y1 = rnd.Next(codeH); int x2 = rnd.Next(codeW); int y2 = rnd.Next(codeH); Color clr = color[rnd.Next(color.Length)]; g.DrawLine(new Pen(clr), x1, y1, x2, y2); } //畫驗證碼字符串 for (int i = 0; i < chkCode.Length; i++) { string fnt = font[rnd.Next(font.Length)]; Font ft = new Font(fnt, fontSize); Color clr = color[rnd.Next(color.Length)]; g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18 + 2, (float)0); } //畫噪點 for (int i = 0; i < 100; i++) { int x = rnd.Next(bmp.Width); int y = rnd.Next(bmp.Height); Color clr = color[rnd.Next(color.Length)]; bmp.SetPixel(x, y, clr); } //清除該頁輸出緩存，設置該頁無緩存 context.Response.Buffer = true; context.Response.ExpiresAbsolute = System.DateTime.Now.AddMilliseconds(0); context.Response.Expires = 0; context.Response.CacheControl = "no-cache"; context.Response.AppendHeader("Pragma", "No-Cache"); //將驗證碼圖片寫入內存流，并將其以 "image/Png" 格式輸出 MemoryStream ms = new MemoryStream(); try { bmp.Save(ms, ImageFormat.Png); context.Response.ClearContent(); context.Response.ContentType = "image/Png"; context.Response.BinaryWrite(ms.ToArray()); } finally { //顯式釋放資源 bmp.Dispose(); g.Dispose(); } } public bool IsReusable { get { return false; } }} |
基本驗證生成代碼demo：
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using System;using System.Drawing;using System.Drawing.Imaging;using System.IO;using System.Web;public partial class image : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { string tmp = RndNum(4); HttpCookie a = new HttpCookie("ImageV", tmp); Response.Cookies.Add(a); this.ValidateCode(tmp); } private void ValidateCode(string VNum) { Bitmap Img = null; Graphics g = null; MemoryStream ms = null; int gheight = VNum.Length * 12; Img = new Bitmap(gheight, 25); g = Graphics.FromImage(Img); //背景顏色 g.Clear(Color.White); //文字字體 Font f = new Font("Arial Black", 10); //文字顏色 SolidBrush s = new SolidBrush(Color.Black); g.DrawString(VNum, f, s, 3, 3); ms = new MemoryStream(); Img.Save(ms, ImageFormat.Jpeg); Response.ClearContent(); Response.ContentType = "image/Jpeg"; Response.BinaryWrite(ms.ToArray()); g.Dispose(); Img.Dispose(); Response.End(); } private string RndNum(int VcodeNum) { string Vchar = "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[] VcArray = Vchar.Split(new Char[] { ',' }); string VNum = ""; int temp = -1; Random rand = new Random(); for (int i = 1; i < VcodeNum + 1; i++) { if (temp != -1) { rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks)); } int t = rand.Next(35); if (temp != -1 && temp == t) { return RndNum(VcodeNum); } temp = t; VNum += VcArray[t]; } return VNum; }} |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
