网站的URL经常会用到编码，网站URL编码的好处是：在不支持中文的浏览器操作系统上也是可以使用的，下面青岛星网就跟大家详细介绍下：ASP网址URL的编码与解码。
在ASP中有内置函数就是Server.URLEncode()，比如Server.URLEncode("青岛星网")得到的就是经过编码后的字符串，这有什么好处呢，就是可以在不同语言访问网址的时候可以正常访问。避免由于语言不同或者编码不同而造成无法访问的情况。
那么怎么把%E5%D0%D2%A3%CF%BF%B9%C8这一串复杂的代码解码为字符串呢？ASP里是没有这个函数的。
Function URLDecode(ByVal urlcode)'URL反编码函数 Dim start,final,length,char,i,butf8,pass Dim leftstr,rightstr,finalstr Dim b0,b1,bx,blength,position,u,utf8 On Error Resume Next b0 = Array(192,224,240,248,252,254) urlcode = Replace(urlcode,"+"," ") pass = 0 utf8 = -1 length = Len(urlcode) : start = InStr(urlcode,"%") : final = InStrRev(urlcode,"%") If start = 0 or length < 3 Then URLDecode = urlcode : Exit Function leftstr = Left(urlcode,start - 1) : rightstr = Right(urlcode,length - 2 - final) For i = start To final char = Mid(urlcode,i,1) If char = "%" Then bx = URLDecode_Hex(Mid(urlcode,i + 1,2)) If bx > 31 And bx < 128 Then i = i + 2 finalstr = finalstr & ChrW(bx) ElseIf bx > 127 Then i = i + 2 If utf8 < 0 Then butf8 = 1 : blength = -1 : b1 = bx For position = 4 To 0 Step -1 If b1 >= b0(position) And b1 < b0(position + 1) Then blength = position Exit For End If Next If blength > -1 Then For position = 0 To blength b1 = URLDecode_Hex(Mid(urlcode,i + position * 3 + 2,2)) If b1 < 128 or b1 > 191 Then butf8 = 0 : Exit For Next Else butf8 = 0 End If If butf8 = 1 And blength = 0 Then butf8 = -2 If butf8 > -1 And utf8 = -2 Then i = start - 1 : finalstr = "" : pass = 1 utf8 = butf8 End If If pass = 0 Then If utf8 = 1 Then b1 = bx : u = 0 : blength = -1 For position = 4 To 0 Step -1 If b1 >= b0(position) And b1 < b0(position + 1) Then blength = position b1 = (b1 xOr b0(position)) * 64 ^ (position + 1) Exit For End If Next If blength > -1 Then For position = 0 To blength bx = URLDecode_Hex(Mid(urlcode,i + 2,2)) : i = i + 3 If bx < 128 or bx > 191 Then u = 0 : Exit For u = u + (bx And 63) * 64 ^ (blength - position) Next If u > 0 Then finalstr = finalstr & ChrW(b1 + u) End If Else b1 = bx * &h100 : u = 0 bx = URLDecode_Hex(Mid(urlcode,i + 2,2)) If bx > 0 Then u = b1 + bx i = i + 3 Else If Left(urlcode,1) = "%" Then u = b1 + Asc(Mid(urlcode,i + 3,1)) i = i + 2 Else u = b1 + Asc(Mid(urlcode,i + 1,1)) i = i + 1 End If End If finalstr = finalstr & Chr(u) End If Else pass = 0 End If End If Else finalstr = finalstr & char End If Next URLDecode = leftstr & finalstr & rightstr End Function Function URLDecode_Hex(ByVal h) On Error Resume Next h = "&h" & Trim(h) : URLDecode_Hex = -1 If Len(h) <> 4 Then Exit Function If isNumeric(h) Then URLDecode_Hex = cInt(h) End Function
function UnUrlcode(InpCode) 'UrlCode编码转换为字符串 Dim Head, SSCode, I, STemp If Trim(InpCode) <> "" Then Head = True UnUrlcode = "" : SSCode = "" For I=1 to Len(InpCode) STemp = Mid(InpCode, I ,1) If STemp = "%" Then STemp = Mid(InpCode, I + 1, 2) If Head Then SSCode = "&H" & STemp '第一个%前加“&H” Head = False Else SSCode = SSCode + STemp Head = True UnUrlcode = UnUrlcode & chr(SSCode) End If I = I + 2 Else UnUrlcode = UnUrlcode & STemp '非汉字直接加原字符 End If Next End If End Function function Urlcode(InpStr) '字符串转换为UrlCode编码 Dim InpAsc,I For I = 1 To Len(InpStr) '取单个字符处理 'msgbox Mid(InpStr, I, 1) & " // " & Asc(Mid(InpStr, I, 1)) InpAsc = Asc(Mid(InpStr, I, 1)) '单个字符的ASC码 If ((InpAsc < 58) And (InpAsc > 47)) Or ((InpAsc < 91) And (InpAsc > 64)) Or ((InpAsc < 123) And (InpAsc > 96)) Then Urlcode = Urlcode & Chr(InpAsc) '如果是数字或字母原字符不变 Else Urlcode = Urlcode & "%" & mid(Trim(Hex(InpAsc)),1,2) & "%" & mid(Trim(Hex(InpAsc)),3,2) End If Next end function
以上2个ASP解码函数都是可以正常使用的。
在线QQ：
