一般处理程序ashx.cs里的代码
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Drawing; using System.Web.SessionState; //IRequiersSessinState的命名空间 namespace Web自己写验证码 { /// <summary> /// Handler1 的摘要说明 /// </summary> public class Handler1 : IHttpHandler,IRequiresSessionState { public void ProcessRequest(HttpContext context) { //要输出的格式 context.Response.ContentType = "img/jpeg"; //context.Response.Write("Hello World"); Bitmap img = new Bitmap(60,30); Graphics gr = Graphics.FromImage(img); Font font = new Font("宋体",12,FontStyle.Bold); SolidBrush brush = new SolidBrush(Color.White); brush.Color = Color.Red; string s = " 123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ"; string str = " "; Random rand = new Random(); for (int i = 0; i < 4; i++) { int start = rand.Next(62); str += s.Substring(start, 1).ToString(); } //将随机生成的验证码放在Session里 context.Session["yanzheng"] = str; gr.DrawString(str,font,brush,0,0); img.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); } public bool IsReusable { get { return false; } } } }
aspx.cs里的代码
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace Web自己写验证码 { public partial class WebForm1 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void ImageButton1_Click(object sender, ImageClickEventArgs e) { //用超链接传值来改变验证码 ImageButton1.ImageUrl = "Handler1.ashx?id=" + new Random().Next(100); } protected void Button1_Click(object sender, EventArgs e) { //输入的验证码和Session里的验证码比较 if (TextBox1.Text.ToUpper().Trim() == Session["yanzheng"].ToString().ToUpper().Trim()) { Response.Write("<script>alert('登录成功')</script>"); } else Response.Write("<script>alert('登录失败')</script>"); } } }
界面里的代码
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Web自己写验证码.WebForm1" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <form id="form1" runat="server"> <div> <br /> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <br /> <br /> <br /> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> 验证码： <asp:TextBox ID="TextBox1" runat="server" Height="28px"></asp:TextBox> 重点！！！！！！ <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/Handler1.ashx" OnClick="ImageButton1_Click" /> </ContentTemplate> </asp:UpdatePanel> <br /> <br /> <br /> <br /> <br /> <br /> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="注册" /> </div> </form> </body> </html>