ASP.net验证码(C#语言),含多种模式(文字,数字,字母等)

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引用 七天雨 和 黑色键盘

 

网上有很多关于验证码做法的资料,但是真正做得完整的却非常少,所以昨天晚上参考了作者:CSDN 上kwklover 的在ASP.Net下实现数字和字符相混合的验证码 (混合,完整,遗憾的是VB.Net,说到这里我想我得感谢stone(QQ9337874),因为我在把VB译成C#的过程中几番出错,最终这段翻译由他完成)!!
随机汉字参考了http://navicy.cnblogs.com/archive/2005/05/08/150756.html这篇文章的,
而最终的纯数字以及GDI+绘图则是从□☆近三十☆(QQ19302038)传给我的一个OA案例里面分离出来的!
所以完整的说,这里面几乎都是别人做好了的,我只是整理出来了!
完整的下载地址是 http://www.cnblogs.com/Files/thcjp/gdi.rar 
下面把代码的重点部分贴出来,如果看源文件有什么不明白可以问偶 QQ110535808
效果如图(我确实懒了点,按纽的名字都没有改,哈哈)
需要说明的是,因为提交对比后,页面是重新刷新了,所以文本框里面看见的和后面图片显示不一样,这个不需要太多说明吧!!
混合模式刷新出现约界错误 已经被 stone(QQ9337874) 修正!!



下面是GDI+绘图的代码段,以及显示的调用等

保存为文件:png.aspx


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.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing.Text;
using System.Drawing;
using System.Text;
public partial class png : System.Web.UI.Page
{
    private readonly string ImagePath = "Validator.jpg";
    private static string gif = "";
    protected void Page_Load(object sender, EventArgs e)
    {
        switch (Request.QueryString["aa"])
        {
            case "1":
                gif = stxt();
                Session["gif"]= stxt();
                break;
            case "2":
                gif = GetRandomint();
                 Session["gif"]= GetRandomint();
                break;
            case "3":
                gif = RndNum(3);
                 Session["gif"]= RndNum(3);
                break;
            default:
                gif = RndNum(3);
                 Session["gif"]= GetRandomint();
                break;
        }
       
        /**////创建Bmp位图
        Bitmap bitMapImage = new System.Drawing.Bitmap(Server.MapPath(ImagePath));
        Graphics graphicImage = Graphics.FromImage(bitMapImage);
        /**////设置画笔的输出模式
        graphicImage.SmoothingMode = SmoothingMode.HighSpeed;
        /**////添加文本字符串
        graphicImage.DrawString(gif, new Font("Arial", 20, FontStyle.Bold), SystemBrushes.WindowText, new Point(0, 0));
        /**////设置图像输出的格式
        Response.ContentType = "image/jpeg";
        /**////保存数据流
        bitMapImage.Save(Response.OutputStream, ImageFormat.Jpeg);
        /**////释放占用的资源
        graphicImage.Dispose();
        bitMapImage.Dispose();
    }
返回纯数字

    private String GetRandomint()
    {
        Random random = new Random();
        return (random.Next(100000, 999999).ToString());
    }
返回文字\数字\字母混合的

public static String RndNum(int VcodeNum)
    {
        String Vchar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z,呵,哈,弹,簧,秤,嬉,戏";
        String[] VcArray = Vchar.Split(',');
        String VNum = "";
        Random random = new Random();
        for (int i = 1; i <= VcodeNum; i++)
        {
            int iNum = 0;
            while ((iNum = Convert.ToInt32(VcArray.Length * random.NextDouble())) ==VcArray.Length )
            {
                iNum = Convert.ToInt32(VcArray.Length * random.NextDouble());
            }
            VNum += VcArray[iNum];
            // VNum += VcArray[Convert.ToInt32(VcArray.Length*random.NextDouble())];
        }
        return VNum;
    }
返回汉字的
       public static object[] CreateRegionCode(int strlength)
        {
            //定义一个字符串数组储存汉字编码的组成元素
            string[] rBase=new String [16]{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
            
            Random rnd=new Random();
        
            //定义一个object数组用来
            object[] bytes=new object[strlength];

            /**//**//**//*每循环一次产生一个含两个元素的十六进制字节数组,并将其放入bject数组中
             每个汉字有四个区位码组成
             区位码第1位和区位码第2位作为字节数组第一个元素
             区位码第3位和区位码第4位作为字节数组第二个元素
            */
            for(int i=0;i<strlength;i++)
            {
                //区位码第1位
                int r1=rnd.Next(11,14);
                string str_r1=rBase[r1].Trim();

                //区位码第2位
                rnd=new Random(r1*unchecked((int)DateTime.Now.Ticks)+i);//更换随机数发生器的种子避免产生重复值
                int r2;
                if (r1==13)
                {
                    r2=rnd.Next(0,7);
                }
                else
                {
                    r2=rnd.Next(0,16);
                }
                string str_r2=rBase[r2].Trim();

                //区位码第3位
                rnd=new Random(r2*unchecked((int)DateTime.Now.Ticks)+i);
                int r3=rnd.Next(10,16);
                string str_r3=rBase[r3].Trim();

                //区位码第4位
                rnd=new Random(r3*unchecked((int)DateTime.Now.Ticks)+i);
                int r4;
                if (r3==10)
                {
                    r4=rnd.Next(1,16);
                }
                else if (r3==15)
                {
                    r4=rnd.Next(0,15);
                }
                else
                {
                    r4=rnd.Next(0,16);
                }
                string str_r4=rBase[r4].Trim();

                //定义两个字节变量存储产生的随机汉字区位码
                byte byte1=Convert.ToByte(str_r1 + str_r2,16);
                byte byte2=Convert.ToByte(str_r3 + str_r4,16);
                //将两个字节变量存储在字节数组中
                byte[] str_r=new byte[]{byte1,byte2};

                //将产生的一个汉字的字节数组放入object数组中
                bytes.SetValue(str_r,i);
                
            }

            return bytes;

            }
    private string stxt()
    {
        Encoding gb = Encoding.GetEncoding("gb2312");
        //调用函数产生4个随机中文汉字编码
        object[] bytes = CreateRegionCode(3);
        //根据汉字编码的字节数组解码出中文汉字
        string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));
        string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));
        string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));
        string txt = str1 + str2 + str3;
        return txt;
    }
}
我们调用页的代码如下
HTML代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="view.aspx.cs" Inherits="view" %>
<!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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        &nbsp;<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Image ID="Image1" runat="server" ImageUrl="png.aspx" /><br />
        <br />
        &nbsp;<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" />
        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
            <asp:ListItem Value="3">默认</asp:ListItem>
            <asp:ListItem Value="1">文字</asp:ListItem>
            <asp:ListItem Value="2">数字</asp:ListItem>
            <asp:ListItem Value="3">混合</asp:ListItem>
        </asp:DropDownList></div>
    </form>
</body>
</html>
CS代码
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        switch (DropDownList1.SelectedValue)
        {
            case "1":
                Image1.ImageUrl = "png.aspx?aa=1";
                break;
            case "2":
                Image1.ImageUrl = "png.aspx?aa=2";
                break;
            case "3":
                Image1.ImageUrl = "png.aspx?aa=3";
                break;
        }
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        if (TextBox1.Text == Session["gif"].ToString())
            Response.Write("OK,正确");
        else
            Response.Write("验证码不符合");
    }

 

-------------------------------------------------------------------------------------

 

在登录页面,通常会有验证码需要用户输入,本文用一个简单的登录窗体来介绍怎么做数字验证码以及使用它。

验证码是一个图片,首先需要一个图片的形成 页面:

pic.aspx:

这个页面中不需要放置任何控件,最好是做以下的设置:

<body topmargin="0" bottommargin="0" leftmargin="0" rightmargin="0">
    <form id="form1" runat="server">  
    </form>

这样有利于图片数字的显示。

pic.aspx.cs

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.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing.Text;
using System.Drawing;

头文件中不可以缺少的部分:

public partial class pic : System.Web.UI.Page
{
    private readonly string ImagePath = "pictrue/Validator.jpg";

//pictrue/Validator.jpg为验证码的背景图片地址
    private static string sValidator = "";

    private void Page_Load(object sender, System.EventArgs e)
    {
        if (Request.Params["Validator"] != null)
        {
            sValidator = Request.Params["Validator"].ToString();
        }

        ///创建Bmp位图
        Bitmap bitMapImage = new System.Drawing.Bitmap(Server.MapPath(ImagePath));
        Graphics graphicImage = Graphics.FromImage(bitMapImage);

        ///设置画笔的输出模式
        graphicImage.SmoothingMode = SmoothingMode.AntiAlias;
        ///添加文本字符串
        graphicImage.DrawString(sValidator, new Font("Arial", 20, FontStyle.Bold), SystemBrushes.WindowText, new Point(0, 0));

        ///设置图像输出的格式
        Response.ContentType = "image/jpeg";

        ///保存数据流
        bitMapImage.Save(Response.OutputStream, ImageFormat.Jpeg);

        ///释放占用的资源
        graphicImage.Dispose();
        bitMapImage.Dispose();
    }
}

图片的形成页完成。

接下来就是在登录页面的使用了:

load.aspx:

登录页面的其它控件不需要介绍,这里只介绍验证码:

页面中放置一个Image控件,用于显示这个验证码

<asp:Image    ID="Image1" runat="server" Height="18px" Width="121px" />

load.aspx.cs中代码:

    static string sValidator = "";
    private readonly string sValidatorImageUrl = "~/pic.aspx?Validator=";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            sValidator = GetRandomint();
            Image1.ImageUrl = sValidatorImageUrl + sValidator;
        }

    }
    private String GetRandomint()
    {//形成变动的数字,这里可以更改你想要的数字大小。
        Random random = new Random();
        return (random.Next(100000, 999999).ToString());
    }

 

获取页面中显示的验证码:
string validator = sValidator.ToString();

-------------------------------------------------

整个登录页面cs代码如下:

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.Data.SqlClient;

public partial class load : System.Web.UI.Page
{
    static string sValidator = "";
    private readonly string sValidatorImageUrl = "~/pic.aspx?Validator=";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            sValidator = GetRandomint();
            Image1.ImageUrl = sValidatorImageUrl + sValidator;
        }

    }
    private String GetRandomint()
    {
        Random random = new Random();
        return (random.Next(100000, 999999).ToString());
    }
    protected void BTHYZ_Click(object sender, EventArgs e)
    {//获取新的验证码
        sValidator = GetRandomint();
        Image1.ImageUrl = sValidatorImageUrl + sValidator;

    }
    protected void BTQX_Click(object sender, EventArgs e)
    {
        this.Page.RegisterClientScriptBlock("", "<script>window.close()</script>");
    }
    protected void BTDL_Click(object sender, EventArgs e)
    {
        string account = "";
        string password = "";
        string code = "";//验证码
        account = this.TBZH.Text.Trim().ToString();
        password = this.TBMM.Text.Trim().ToString();
        code = this.TBYZM.Text.Trim().ToString();
        //判断验证码的正确性
        string validator = sValidator.ToString();
        if (code != validator)
        {
            this.LBsuggest.Text = "输入验证码不正确,请重新输入" + "<br/>";

        }
        else
        {
            this.LBsuggest.Text="";
            //依据输入内容到数据库判断帐号和密码
            string connection = "Persist Security Info=false;Integrated Security=true;DataBase=keyboli;Server=.//sqlexpress";
            SqlConnection con = new SqlConnection(connection);
            con.Open();
            SqlCommand com = new SqlCommand("select Pwd from UserTable where UserName='" + account + "'", con);
            SqlDataReader dr = com.ExecuteReader();
            if (!dr.Read())
            {
                this.LBsuggest.Text = "您输入的帐号不存在!请重新输入";
         
             
            }
            else
            {
                string pw = dr[0].ToString().Trim();
                if (pw == password)
                {
                    //写入session中
                    Session["user"] = account.ToString().Trim();
                    this.Response.Redirect("~/user/Framework.aspx");
                   
                }
                else
                {
                    this.LBsuggest.Text = "您输入的帐号或者密码不正确!";
                
                }

 
            }
            dr.Close();
            con.Close();
        }
    }
}