ASP.NET开发中验证码的实现步骤
来源:爱站网时间:2020-06-29编辑:网友分享
用户注册需要输入验证码的步骤,这个功能现在已经普及到很多开发了,那么它是如何产生的呢?别着急,今天爱站技术频道小编就为大家带来了ASP.NET开发中验证码的实现步骤,希望能帮到大家。
用户注册需要输入验证码的步骤,这个功能现在已经普及到很多开发了,那么它是如何产生的呢?别着急,今天爱站技术频道小编就为大家带来了ASP.NET开发中验证码的实现步骤,希望能帮到大家。
我主要是看到干扰线了,一个验证码里面要是没有干扰线什么的,至少得在噪点和随机码的排版上下工夫:
////// 验证码生成类 /// public class verify_code : IHttpHandler, IRequiresSessionState { public void ProcessRequest(HttpContext context) { int codeW = 80; int codeH = 22; int fontSize = 16; string chkCode = string.Empty; //颜色列表,用于验证码、噪线、噪点 Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue }; //字体列表,用于验证码 string[] font = { "Times New Roman", "Verdana", "Arial", "Gungsuh", "Impact" }; //验证码的字符集,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(); //生成验证码字符串 for (int i = 0; i
基本验证生成代码demo:
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); //背景颜色 g.Clear(Color.White); //文字字体 Font f = new Font("Arial Black", 10); //文字颜色 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
以上就是爱站技术频道小编为大家带来的ASP.NET开发中验证码的实现步骤,相信认真看完的朋友都已经懂了,我们要根据实际来考虑哦,若有不完整也欢迎大家补充。