網上有很多關于驗證碼做法的資料,但是真正做得完整的卻非常少,所以昨天晚上參考了作者：CSDN 上kwklover 的
在ASP.NET下實現數字和字符相混合的驗證碼
(混合,完整,遺憾的是vb.net,說到這里我想我得感謝stone(QQ9337874),因為我在把VB譯成C#的過程中幾番出錯,最終這段翻譯由他完成)!!
隨機漢字參考了
http://navicy.cnblogs.com/archive/2005/05/08/150756.html
這篇文章的,
而最終的純數字以及GDI+繪圖則是從□☆近三十☆(QQ19302038)傳給我的一個OA案例里面分離出來的!
所以完整的說,這里面幾乎都是別人做好了的,我只是整理出來了!
完整的下載地址是
http://www.cnblogs.com/Files/thcjp/gdi.rar
下面把代碼的重點部分貼出來，如果看源文件有什么不明白可以問偶?。眩眩保保埃担常担福埃?br />
效果如圖(我確實懶了點,按紐的名字都沒有改,哈哈)
需要說明的是,因為提交對比后,頁面是重新刷新了,所以文本框里面看見的和后面圖片顯示不一樣,這個不需要太多說明吧!!
?混合模式刷新出現約界錯誤 已經被 stone(QQ9337874) 修正!!
下面是ＧＤＩ＋繪圖的代碼段，以及顯示的調用等
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
;
????????}
????????
????????
/**/
///
創建Bmp位圖
????????Bitmap?bitMapImage?
=
?
new
?System.Drawing.Bitmap(Server.MapPath(ImagePath));
????????Graphics?graphicImage?
=
?Graphics.FromImage(bitMapImage);
????????
/**/
///
設置畫筆的輸出模式
????????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
));
????????
/**/
///
設置圖像輸出的格式
????????Response.ContentType?
=
?
"
image/jpeg
"
;
????????
/**/
///
保存數據流
????????bitMapImage.Save(Response.OutputStream,?ImageFormat.Jpeg);
????????
/**/
///
釋放占用的資源
????????graphicImage.Dispose();
????????bitMapImage.Dispose();
????}
返回純數字
????
private
?String?GetRandomint()
????
{
????????Random?random?
=
?
new
?Random();
????????
return
?(random.Next(
100000
,?
999999
).ToString());
????}
返回文字＼數字＼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,彈,簧,秤,嬉,戲
"
;
????????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;
????}
?
返回漢字的
???????
public
?
static
?
object
[]?CreateRegionCode(
int
?strlength)?
????????
{?
????????????
//
定義一個字符串數組儲存漢字編碼的組成元素?
????????????
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();?
?????????
????????????
//
定義一個object數組用來?
????????????
object
[]?bytes
=
new
?
object
[strlength];?
?
????????????
/**/
/**/
/**/
/*
每循環一次產生一個含兩個元素的十六進制字節數組，并將其放入bject數組中?
?????????????每個漢字有四個區位碼組成?
?????????????區位碼第1位和區位碼第2位作為字節數組第一個元素?
?????????????區位碼第3位和區位碼第4位作為字節數組第二個元素?
????????????
*/
?
????????????
for
(
int
?i
=
0
;i
<
strlength;i
++
)?
????????????
{?
????????????????
//
區位碼第1位?
????????????????
int
?r1
=
rnd.Next(
11
,
14
);?
????????????????
string
?str_r1
=
rBase[r1].Trim();?
?
????????????????
//
區位碼第2位?
????????????????rnd
=
new
?Random(r1
*
unchecked
((
int
)DateTime.Now.Ticks)
+
i);
//
更換隨機數發生器的種子避免產生重復值?
????????????????
int
?r2;?
????????????????
if
?(r1
==
13
)?
????????????????
{?
????????????????????r2
=
rnd.Next(
0
,
7
);?
????????????????}
?
????????????????
else
?
????????????????
{?
????????????????????r2
=
rnd.Next(
0
,
16
);?
????????????????}
?
????????????????
string
?str_r2
=
rBase[r2].Trim();?
?
????????????????
//
區位碼第3位?
????????????????rnd
=
new
?Random(r2
*
unchecked
((
int
)DateTime.Now.Ticks)
+
i);?
????????????????
int
?r3
=
rnd.Next(
10
,
16
);?
????????????????
string
?str_r3
=
rBase[r3].Trim();?
?
????????????????
//
區位碼第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();?
?
????????????????
//
定義兩個字節變量存儲產生的隨機漢字區位碼?
????????????????
byte
?byte1
=
Convert.ToByte(str_r1?
+
?str_r2,
16
);?
????????????????
byte
?byte2
=
Convert.ToByte(str_r3?
+
?str_r4,
16
);?
????????????????
//
將兩個字節變量存儲在字節數組中?
????????????????
byte
[]?str_r
=
new
?
byte
[]
{byte1,byte2}
;?
?
????????????????
//
將產生的一個漢字的字節數組放入object數組中?
????????????????bytes.SetValue(str_r,i);?
?????????????????
????????????}
?
?
????????????
return
?bytes;?
?
????????????}
????
private
?
string
?stxt()
????
{
????????Encoding?gb?
=
?Encoding.GetEncoding(
"
gb2312
"
);
????????
//
調用函數產生4個隨機中文漢字編碼?
????????
object
[]?bytes?
=
?CreateRegionCode(
3
);
????????
//
根據漢字編碼的字節數組解碼出中文漢字?
????????
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;
????}
我們調用頁的代碼如下
ＨＴＭＬ代碼
<%
@?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
>
無標題頁
</
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"
>
默認
</
asp:ListItem
>
????????????
<
asp:ListItem?
Value
="1"
>
文字
</
asp:ListItem
>
????????????
<
asp:ListItem?
Value
="2"
>
數字
</
asp:ListItem
>
????????????
<
asp:ListItem?
Value
="3"
>
混合
</
asp:ListItem
>
????????
</
asp:DropDownList
></
div
>
????
</
form
>
</
body
>
</
html
>
ＣＳ代碼
????
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,正確
"
);
????????
else
????????????Response.Write(
"
驗證碼不符合
"
);
????}
posted on 2006-09-20 12:50
圣域飛俠 閱讀(534)
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