验证码

YZM.ashx.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;

namespace WebApplication1
{
    /// <summary>
    /// YZM 的摘要说明
    /// </summary>
    public class YZM : IHttpHandler, System.Web.SessionState.IRequiresSessionState
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "image/JPEG";
            using (System.Drawing.Bitmap bitmap = new Bitmap(100, 50))
            {
                using (Graphics graphics = Graphics.FromImage(bitmap))
                {
                    Random random = new Random();
                   
                    int code = random.Next(1000, 9999);
                    string strCode = Convert.ToString(code);


                    //将验证码添加到Session中
                    HttpContext.Current.Session["Code"] = strCode;

                    Font font = new Font("宋体", 20);
                    graphics.DrawString(strCode, font, Brushes.Green, new System.Drawing.PointF(0, 0));

                    for (int i = 0; i < 5; i++)
                    {
                        graphics.DrawRectangle(Pens.BlueViolet, 0+i *5, 0+ i*8, 32, 8);
                        graphics.DrawRectangle(Pens.BlueViolet, 0 + i*5, 0 + i*8, 32, 8);
                    }

                    bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

                }

            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

View Code

验证码测试.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="验证码测试.aspx.cs" Inherits="WebApplication1.验证码测试" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <img src="YZM.ashx" onclick="src='YZM.ashx?aaa='+ new Date()"/>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
    </div>
    </form>
</body>
</html>

View Code

验证码测试.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class 验证码测试 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string strCode = Convert.ToString(Session["Code"]);

            if (strCode == TextBox1.Text)
            {
                Response.Write("验证码正确");
            }
            else
            {
                Response.Write("验证码错误");
            }
        }
    }
}

View Code

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原文地址：https://www.cnblogs.com/easy5weikai/p/3359000.html