【下载文档:  用asp应用程序实现自己的UrlDeCode.txt 】

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用ASP应用程序实现自己的UrlDeCode
即： 　　如果有空格就用%20代替，如果有其它字符就用%ASCII代替，如果有汉字等四个字节的字符，就用两个%ASCII来代替。不过有时候我们也需要将经过这种编码的字符串进行解码，但asp并没有提供相关的函数，这给我们处理问题带来了一定的麻烦。其实我们只要知道了编码规则后，就可以用asp代码来实现我们自己的URlDecode函数了。具体实现如下： 复制代码 代码如下:function urldecode(encodestr) newstr="" havechar=false lastchar="" for i=1 to len(encodestr) char_c=mid(encodestr,i,1) if char_c="+" then newstr=newstr & " " elseif char_c="%" then next_1_c=mid(encodestr,i+1,2) next_1_num=cint("&H" & next_1_c) if havechar then havechar=false newstr=newstr & chr(cint("&H" & lastchar & next_1_c)) else if abs(next_1_num)<=127 then newstr=newstr & chr(next_1_num) else havechar=true lastchar=next_1_c end if end if i=i+2 else newstr=newstr & char_c end ifnext urldecode=newstr end function 下面为大家提供一个更成熟的函数：复制代码 代码如下:'================================================ '函数名：URLDecode '作 用：URL解码 '================================================ Function URLDecode(ByVal urlcode) 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