验证码的三种做法[纯数字][纯汉字][字母/数字/汉字混合]

来源：互联网发布：java对象内存分配编辑：程序博客网时间：2024/04/29 16:45

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

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 " );