1、把下面的代码另存为code.asp文件<%Sub ImageValidCode(sName) Response.Expires = -1 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 = 36 ' 文字数量 Const cCode = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" '颜色的数据(字符，背景) Dim vColorData(1) vColorData(0) = ChrB(255) & ChrB(000) & ChrB(000) '字符颜色 vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255) '背景颜色 Dim vCode(4), vCodes For i=0 To 3 vCode(i) = Int(Rnd * cAmount) vCodes = vCodes & Mid(cCode, vCode(i)+1, 1) Next Session.Value(sName) = vCodes'记录入Session Dim vNumberData(35) vNumberData(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111" vNumberData(1) = "1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111" vNumberData(2) = "1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011" vNumberData(3) = "1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111" vNumberData(4) = "1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011" vNumberData(5) = "1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111" vNumberData(6) = "1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111" vNumberData(7) = "1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111" vNumberData(8) = "1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111" vNumberData(9) = "1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111" vNumberData(10) = "1111011111111101111111101011111110101111111010111111101011111100000111110111011111011101111000100011" vNumberData(11) = "1000000111110111101111011110111101110111110000111111011101111101111011110111101111011110111000000111" vNumberData(12) = "1110000011110111101110111110111011111111101111111110111111111011111111101111101111011101111110001111" vNumberData(13) = "1000001111110111011111011110111101111011110111101111011110111101111011110111101111011101111000001111" vNumberData(14) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011110111000000111" vNumberData(15) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011111111000111111" vNumberData(16) = "1110000111110111011110111101111011111111101111111110111111111011100011101111011111011101111110001111" vNumberData(17) = "1000100011110111011111011101111101110111110000011111011101111101110111110111011111011101111000100011" vNumberData(18) = "1100000111111101111111110111111111011111111101111111110111111111011111111101111111110111111100000111" vNumberData(19) = "1110000011111110111111111011111111101111111110111111111011111111101111111110111110111011111000011111" vNumberData(20) = "1000100011110111011111011011111101011111110001111111010111111101101111110110111111011101111000100011" vNumberData(21) = "1000111111110111111111011111111101111111110111111111011111111101111111110111111111011110111000000011" vNumberData(22) = "1000100011110010011111001001111100100111110101011111010101111101010111110101011111010101111001010011" vNumberData(23) = "1000100011110011011111001101111101010111110101011111010101111101100111110110011111011001111000110111" vNumberData(24) = "1110001111110111011110111110111011111011101111101110111110111011111011101111101111011101111110001111" vNumberData(25) = "1000000111110111101111011110111101111011110000011111011111111101111111110111111111011111111000111111" vNumberData(26) = "1110001111110111011110111110111011111011101111101110111110111011111011101001101111011001111110001011" vNumberData(27) = "1000001111110111011111011101111101110111110000111111010111111101101111110110111111011101111000110011" vNumberData(28) = "1110000011110111101111011110111101111111111001111111111001111111111011110111101111011110111100000111" vNumberData(29) = "1000000011101101101111110111111111011111111101111111110111111111011111111101111111110111111110001111" vNumberData(30) = "1000100011110111011111011101111101110111110111011111011101111101110111110111011111011101111110001111" vNumberData(31) = "1000100011110111011111011101111101110111111010111111101011111110101111111010111111110111111111011111" vNumberData(32) = "1001010011110101011111010101111101010111110101011111001001111110101111111010111111101011111110101111" vNumberData(33) = "1000100011110111011111101011111110101111111101111111110111111110101111111010111111011101111000100011" vNumberData(34) = "1000100011110111011111011101111110101111111010111111110111111111011111111101111111110111111110001111" vNumberData(35) = "1100000011110111011111111101111111101111111110111111110111111111011111111011111111101110111100000011" ' 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 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 Call ImageValidCode("GetCode") %>
2、在需要调用验证码的地方，插入下面的代码，就会显示验证码<img src="code.asp" />
3、有时生成的验证码图片看不清楚，需要增加一个点击验证码刷新的功能，代码如下图一：.为了提示用户，可以加上文字提示，修改鼠标指向验证码时的形状，代码如下图二：.完整的例子放在百度网盘中，需要的请发邮件到 [email protected]主题写 “百度经验”。自动回复下载地址。注：在运行例子前需要配置好ASP的运行环境
