ASP.NET验证码

来源：互联网发布：淘宝买家秀情趣福利编辑：程序博客网时间：2024/04/30 18:49

using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Drawing;public partial class Verify : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        Random random = new Random();        int RadNum = random.Next(1000, 10000);        Session["Verifycode"] = RadNum.ToString();        Bitmap image = new Bitmap(40, 16);        Graphics g = Graphics.FromImage(image);        g.Clear(Color.White);        //绘制验证码        g.DrawString(RadNum.ToString(), new Font("黑体", 12), new SolidBrush(Color.Black), 0, 0);        //绘制杂色        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()));        }        //绘制划痕        for (int i = 0; i < 2; i++)        {            int x1 = random.Next(image.Width);            int y1 = random.Next(image.Height);            int x2 = random.Next(image.Width);            int y2 = random.Next(image.Height);            g.DrawLine(new Pen(Color.Black), x1, y1, x2, y2);        }        image.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);    }}

Verify.aspx页面里面写着绘制的图形。

<img id="imgCode" onclick="src='/verify.aspx?s='+Math.random()" src="/verify.aspx"/>

html页面中用来显示验证码的地方