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验证码的三种做法[纯数字][纯汉字][字母\数字\汉字混合]

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 >
         &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 " );
    }
posted on 2006-09-20 12:50 圣域飞侠 阅读(529) 评论(0)  编辑  收藏 所属分类: C#文章

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