登陆界面验证码的编写

来源：互联网发布：江苏广电网络电视台编辑：程序博客网时间：2024/06/08 06:41

建立两个web窗体，一个为：yanzhengma，一个为：yanzheng

1、yanzhengma.aspx的设计

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="yanzhengma.aspx.cs" Inherits="练习10._12.yanzhengma" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

2、yanzhengma.aspx.cs的设计

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

namespace 练习10._12
{
    public partial class yanzhengma : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

}

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (TextBox1.Text == Session["Code"].ToString())
            {
                Response.Write("正确");
            }
            else
            {
                Response.Write("不正确");
            }

        }
    }
}

3、yanzheng.aspx的设计

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="yanzheng.aspx.cs" Inherits="练习10._12.yanzheng" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

4、yanzheng.aspx.cs的设计

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

namespace 练习10._12
{
    public partial class yanzheng : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           Response.ContentType = "image/jpeg";
            using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(57, 27))
            {
                using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
                {
                    Random rand = new Random();
                    int code = rand.Next(1000, 9999);
                    string verCode = code.ToString();
                    Session["Code"] = verCode;//写一个session:Session["Code"],把随机生成的verCode存进去。

g.DrawString(verCode, new System.Drawing.Font("黑体", 19), System.Drawing.Brushes.Green, 0, 0);
bitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

                }
            }
        }
    }
}