本文给大家分享的是一段使用asp实现的验证码功能,而且是带刷新的,代码非常简洁,非常实用,有需要的小伙伴可以参考下。
将以下代码放到一个单独的页面checkcode.asp
- <%
- Option Explicit
- Response.buffer=true
- Call Com_CreatValidCode("validateCode")
- Sub Com_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
- Dim i, ii, iii
- Const cOdds = 2 ' 杂点出现的机率
- Const cAmount = 10 ' 文字数量
- Const cCode = "0123456789"
- ' 颜色的数据(字符,背景)
- Dim vColorData(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
- Dim vCode(4), vCodes
- For i = 0 To 3
- 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
- Dim vNumberData(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)
- For i = 9 To 0 Step -1 ' 历经所有行
- For ii = 0 To 3 ' 历经所有字
- For iii = 1 To 10 ' 历经所有像素
- ' 逐行、逐字、逐像素地输出图像数据
- If Rnd * 99 + 1 < cOdds Then ' 随机生成杂点
- Response.BinaryWrite vColorData(0)
- Else
- Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1))
- End If
- Next
- Next
- Next
- End Sub
- %>
需要用得页面用如下方式引用:
验证码: src="checkcode.asp " cellpadding="0" cellspacing="0" style="border-collapse: collapse; border-spacing: 0px; width: 780px; clear: both; padding: 0px !important; margin: 0px !important; font-size: 1em !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; background-image: none !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; min-height: inherit !important;">
以上所述就是本文的全部内容了,希望大家能够喜欢。
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