验证码源代码-阿里云开发者社区

下面是ＧＤＩ＋绘图的代码段，以及显示的调用等

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 >

  < asp:TextBox ID ="TextBox1" runat ="server" ></ asp:TextBox >

< asp:Image ID ="Image1" runat ="server" ImageUrl ="png.aspx" />< br />

< br />

  < 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");

}

验证码源代码

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