波斯码BOSSMA Information Technology

完整asp.net图形验证码程序

发布时间:2007年6月1日 / 分类:ASP.NET / 次浏览 / 评论

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();
        }
    }
}
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目前有3 条评论

  1. bossma 地板:

    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

  2. df 板凳:

    不行啊这个。没图片

  3. pinksky 沙发:

    正需要,收藏了,谢谢!

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