asp实现带刷新功能的验证码代码

7792016-06-14

将以下代码放到一个单独的页面checkcode.asp

<%

OptionExplicit

Response.buffer=true

CallCom_CreatValidCode("validateCode")

 

SubCom_CreatValidCode(pSN)

' 禁止缓存

Response.Expires = -9999

Response.AddHeader"Pragma","no-cache"

Response.AddHeader"cache-ctrol","no-cache"

Response.ContentType ="Image/BMP"

 

Randomize

 

Dimi, ii, iii

 

ConstcOdds = 2' 杂点出现的机率

ConstcAmount = 10' 文字数量

ConstcCode ="0123456789"

 

' 颜色的数据(字符,背景)

DimvColorData(1)

vColorData(0) = ChrB(0) & ChrB(0) & ChrB(211)' 蓝0,绿0,红0(黑色)

vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255)' 蓝250,绿236,红211(浅蓝色)

 

' 随机产生字符

DimvCode(4), vCodes

Fori = 0To3

vCode(i) = Int(Rnd * cAmount)

vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1)

Next

Session(pSN) = vCodes'记录入Session

' 字符的数据

DimvNumberData(9)

vNumberData(0) =

 

"1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111

 

110000111"

vNumberData(1) =

 

"1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111

 

100000111"

vNumberData(2) =

 

"1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111

 

100000011"

vNumberData(3) =

 

"1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111

 

110000111"

vNumberData(4) =

 

"1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111

 

111000011"

vNumberData(5) =

 

"1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111

 

110000111"

vNumberData(6) =

 

"1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111

 

110000111"

vNumberData(7) =

 

"1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111

 

111011111"

vNumberData(8) =

 

"1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111

 

110000111"

vNumberData(9) =

 

"1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111

 

110001111"

' 输出图像文件头

Response.BinaryWrite ChrB(66) & ChrB(77) & ChrB(230) & ChrB(4) & ChrB(0) & ChrB(0) & ChrB(0)

 

& ChrB(0) &_

ChrB(0) & ChrB(0) & ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) &_

ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(10) & ChrB(0) &_

ChrB(0) & ChrB(0) & ChrB(1) & ChrB(0)

 

' 输出图像信息头

Response.BinaryWrite ChrB(24) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(176)

 

& ChrB(4) &_

ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) &_

ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_

ChrB(0) & ChrB(0)

 

Fori = 9To0Step-1' 历经所有行

Forii = 0To3' 历经所有字

Foriii = 1To10' 历经所有像素

' 逐行、逐字、逐像素地输出图像数据

IfRnd * 99 + 1 < cOddsThen' 随机生成杂点

Response.BinaryWrite vColorData(0)

Else

Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1))

EndIf

Next

Next

Next

EndSub

%>

需要用得页面用如下方式引用:
验证码:  src="checkcode.asp " alt="验证码,看不清楚?请点击刷新验证码" height="10" style="cursor :
 pointer;" onClick="this.src='checkcode.asp?t='+(new Date().getTime());" >
判断页面:

<%

if trim(session("validateCode")) <> trim(Request("txt_check")) then

ErrorMessage = "请输入正确的验证码"

response.write(" <script>alert('"&ErrorMessage&"');location.href='Default.asp' </script>")

response.end

end if

%>

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