前几天在网上找到的,我调试了一下,现在发布出来:
1、测试页面:Default.aspx
<%@ Page Language="C#" AutoEventWireup="true"? CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> ??? <title>ASP.NET验证码</title> </head> <body> ??? <form id="form1" runat="server"> ??? <div> ??????? 请输入验证码:<input id="txtVI" type="text" name="view_id" runat="server" maxlength="5" size="5"/> ???? <asp:Image id="Image1" runat="server" ImageUrl="ValidateCode.aspx" ImageAlign="Middle" /> ??????? <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="您没有输入验证码" ControlToValidate="txtVI"></asp:RequiredFieldValidator><br /> ??????? <asp:Button ID="Button1" runat="server" Text="提 交" OnClick="Button1_Click" /></div> ??? </form> </body> </html>
2、测试页面后台:Default.aspx.cs
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; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { string VNum; VNum = Session["VNum"].ToString(); Session.Abandon(); ViewState["VNum"] = VNum; if (txtVI.Value == ViewState["VNum"].ToString()) { Response.Write("<script type="text/javascript">alert('验证码正确');</script>"); return; } else { Response.Write("<script type="text/javascript">alert('所填写的验证码不正确');</script>"); return; } } }
3、生成验证码页面:ValidateCode.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ValidateCode.aspx.cs" Inherits="ValidateCode" >
4、生成验证码页面后台:
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; /* Copyright all(c) 2005 ZhongFeng, http://blog.csdn.net/SW515 */ public partial class ValidateCode : System.Web.UI.Page { private void Page_Load(object sender, System.EventArgs e) { this.CreateCheckCodeImage(GenerateCheckCode()); } #region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); } /// /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion private string GenerateCheckCode() { int number; char code; string checkCode = String.Empty; System.Random random = new Random(); for (int i = 0; i < 5; i++) { number = random.Next(); if (number % 2 == 0) code = (char)('0' + (char)(number % 10)); else code = (char)('A' + (char)(number % 26)); checkCode += code.ToString(); } Session["VNum"] = checkCode; return checkCode; } private void CreateCheckCodeImage(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)), 22); System.Drawing.Graphics g = Graphics.FromImage(image); 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 < 25; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); } Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic)); 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(checkCode, font, brush, 2, 2); //画图片的前景噪音点 for (int i = 0; i < 100; 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(); } } }
To @df
我一直在用,您能详细说一下吗?
[以下这个页面用到了]
ASP.NET随机汉字随机位置随机颜色随机字体验证码
不行啊这个。没图片
正需要,收藏了,谢谢!
发表评论
相关文章
国内AI资源汇总,AI聊天、AI绘画、AI写作、AI视频、AI设计、AI编程、AI音乐等,国内顺畅访问,无需科学上网。
扫码或点击进入:萤火AI大全
文章分类
最新评论