请问将BASE64编码字串解码？

[zixii]

怎么实现？什么函数？

[hotenM]

什么状况

[zixii]

是这样的，要把php文件改为jsp文件。其中用到一个php的函数base64_decode。

printf("发送数据：<B>%s</B>\n<BR>",base64_decode($response->Data));

response的Data是一个String.

请问这里应该怎么改？？

[无爱大叔]

脚本实现的，不知道可以帮你吗？
<script language=vbs>
OPTION EXPLICIT
const BASE_64_MAP_INIT="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
dim nl

dim Base64EncMap(63)
dim Base64DecMap(127)

PUBLIC SUB initCodecs()
nl = "<P>" & chr(13) & chr(10)
dim max, idx
max = len(BASE_64_MAP_INIT)
for idx = 0 to max - 1
Base64EncMap(idx) = mid(BASE_64_MAP_INIT, idx + 1, 1)
next
for idx = 0 to max - 1
Base64DecMap(ASC(Base64EncMap(idx))) = idx
next
END SUB

PUBLIC FUNCTION base64Encode(plain)

if len(plain) = 0 then
base64Encode = ""
exit function
end if

dim ret, ndx, by3, first, second, third
by3 = (len(plain) \ 3) * 3
ndx = 1
do while ndx <= by3
first = asc(mid(plain, ndx+0, 1))
second = asc(mid(plain, ndx+1, 1))
third = asc(mid(plain, ndx+2, 1))
ret = ret & Base64EncMap( (first \ 4) AND 63 )
ret = ret & Base64EncMap( ((first * 16) AND 48) + ((second \ 16)AND 15 ) )
ret = ret & Base64EncMap( ((second * 4) AND 60) + ((third \ 64)AND 3 ) )
ret = ret & Base64EncMap( third AND 63)
ndx = ndx + 3
loop

if by3 < len(plain) then
first = asc(mid(plain, ndx+0, 1))
ret = ret & Base64EncMap( (first \ 4) AND 63 )
if (len(plain) MOD 3 ) = 2 then
second = asc(mid(plain, ndx+1, 1))
ret = ret & Base64EncMap( ((first * 16) AND 48) +((second \16) AND 15 ) )
ret = ret & Base64EncMap( ((second * 4) AND 60) )
else
ret = ret & Base64EncMap( (first * 16) AND 48)
ret = ret & "="
end if
ret = ret & "="
end if

base64Encode = ret
END FUNCTION

PUBLIC FUNCTION base64Decode(scrambled)

if len(scrambled) = 0 then
base64Decode = ""
exit function
end if

dim realLen
realLen = len(scrambled)
do while mid(scrambled, realLen, 1) = "="
realLen = realLen - 1
loop
dim ret, ndx, by4, first, second, third, fourth
ret = ""
by4 = (realLen \ 4) * 4
ndx = 1
do while ndx <= by4
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
third = Base64DecMap(asc(mid(scrambled, ndx+2, 1)))
fourth = Base64DecMap(asc(mid(scrambled, ndx+3, 1)))
ret = ret & chr( ((first * 4) AND 255)+((second\16) AND 3))
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15) )
ret = ret & chr( ((third * 64) AND 255) + (fourth AND 63) )
ndx = ndx + 4
loop

if ndx < realLen then
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
ret = ret & chr( ((first * 4) AND 255) +((second \ 16) AND 3))
if realLen MOD 4 = 3 then
third = Base64DecMap(asc(mid(scrambled,ndx+2,1)))
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15) )
end if
end if

base64Decode = ret
END FUNCTION

' 首先初始化
call initCodecs
</script>
<input id=a1><br>
<input type=button value=编码 onclick="encoded.value= base64Encode(a1.value)">
<input id=encoded><br>
<input type=button value=解码 onclick="decoded.value= base64Decode(encoded.value)">
<input id=decoded>

[zixii]

请教一下，这个函数是哪个类里的？什么函数？急~！

[zixii]

我推一下~~