高手帮我看看www.haoyao.net的验证码该怎么做？老有垃圾信息，这个网站是我们公司的，最近一段时间来由群发信息的，网站属于我们技术人员独立开发的。但是在验证码上可能防范不够，很容有垃圾、群发信息，那么如何制作验证码能够彻底防止垃圾信息呢？
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cookie 记录时间和IP
检查程序
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这是我的验证码生成，调用的时候如下
验证码：
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/ImageUrl.aspx" CssClass="img" />
这里的ImageUrl.aspx就是下面的页面，页面上不用写任何东西，只需要将以下代码粘贴到后台即可，当然你也可以根据自己的需求多加些干扰线
- C# code
using System;using System.Data;using System.Configuration;using System.Collections;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.Drawing;using System.Drawing.Drawing2D;public partial class ImageUrl : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { GetCheckCodeImage(GetCode(5)); } //产生随机字符串 private string GetCode(int num) { string[] source ={ "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" ,"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 code = ""; Random rd = new Random(); for (int i = 0; i < num; i++) { code += source[rd.Next(0, source.Length)]; } Session["ValidateCode"] = code;//将字符串保存到Session中，以便需要时进行验证 return code; } #region 验证码 /// <summary> /// 生成验证码 /// </summary> /// <param name="checkCode"></param> private void GetCheckCodeImage(string checkCode) { if (checkCode == null || checkCode.Trim() == String.Empty) return; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 18); Graphics g = Graphics.FromImage(image); try { Random random = new Random(); //生成随机生成器 g.Clear(Color.White); //清空图片背景色 for (int i = 0; i < 5; i++) //画图片的背景噪音线 { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); if (i / 2 == 0) { g.DrawLine(new Pen(Color.Red), x1, y1, x2, y2); } else { g.DrawLine(new Pen(Color.Blue), x1, y1, x2, y2); } } Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic)); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 3.6f, true); g.DrawString(checkCode, font, brush, 2, 2); //画图片的前景噪音点 for (int i = 0; i < 60; 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); Response.ClearContent(); Response.ContentType = "image/Gif"; Response.BinaryWrite(ms.ToArray()); } finally { g.Dispose(); image.Dispose(); } } #endregion}