asp实现带刷新功能的验证码代码
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.BinaryWriteChrB(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.BinaryWriteChrB(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.BinaryWritevColorData(0)
Else
Response.BinaryWritevColorData(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='+(newDate().getTime());">
判断页面：
<%
iftrim(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
endif
%>
以上所述就是本文的全部内容了，希望大家能够喜欢。