使用asp代码突破图片的防盗连

　　从网上来的代码，，稍微修改了一些地方，其实用的是cache类。。

保存代码为，比如pic.asp
使用:

不光是163，其实就是很多防盗连的图片都可以这个实现。

<%
盗链判断
IfInstr(Request.ServerVariables(http_referer),
Response.Write非法链接
Response.End
EndIf

Dimurl,body,myCache

url=Request.QueryString(url)

SetmyCache=newcache
IfmyCache.validThen
body=myCache.value
Else
body=GetWebData(url)
myCache.addbody,dateadd(d,1,now)
EndIf

IfErr.Number=0Then
Response.CharSet=UTF-8
Response.BinaryWritebody
Response.Flush
Else
Wscript.EchoErr.Description
Endif

取得数据
PublicFunctionGetWebData(ByValstrUrl)
Dimcurlpath
curlpath=Mid(strUrl,1,Instr(8,strUrl,/))
DimRetrieval
SetRetrieval=Server.CreateObject(Microsoft.XMLHTTP)
WithRetrieval
.OpenGet,strUrl,False,,
.setRequestHeaderReferer,curlpath
.Send
GetWebData=.ResponseBody
EndWith
SetRetrieval=Nothing
EndFunction


cache类

classCache
privateobjcache内容
privateexpireTime过期时间
privateexpireTimeName过期时间application名
privatecacheNamecache内容application名
privatepathurl

privatesubclass_initialize()
path=request.servervariables(url)
path=left(path,instrRev(path,/))
endsub

privatesubclass_terminate()
endsub

publicpropertygetblEmpty
是否为空
ifisempty(obj)then
blEmpty=true
else
blEmpty=false
endif
endproperty

publicpropertygetvalid
是否可用(过期)
ifisempty(obj)ornotisDate(expireTime)then
valid=false
elseifCDate(expireTime)<nowthen
valid=false
else
valid=true
endif
endproperty

publicpropertyletname(str)
设置cache名
cacheName=str&path
obj=application(cacheName)
expireTimeName=str&expires&path
expireTime=application(expireTimeName)
endproperty

publicpropertyletexpires(tm)
重设置过期时间
expireTime=tm
application.lock
application(expireTimeName)=expireTime
application.unlock
endproperty

publicsubadd(var,expire)
赋值
ifisempty(var)ornotisDate(expire)then
exitsub
endif
obj=var
expireTime=expire
application.lock
application(cacheName)=obj
application(expireTimeName)=expireTime
application.unlock
endsub

publicpropertygetvalue
取值
ifisempty(obj)ornotisDate(expireTime)then
value=null
elseifCDate(expireTime)<nowthen
value=null
else
value=obj
endif
endproperty

publicsubmakeEmpty()
释放application
application.lock
application(cacheName)=empty
application(expireTimeName)=empty
application.unlock
obj=empty
expireTime=empty
endsub

publicfunctionequal(var2)
比较
iftypename(obj)<>typename(var2)then
equal=false
elseiftypename(obj)=Objectthen
ifobjisvar2then
equal=true
else
equal=false
endif
elseiftypename(obj)=Variant()then
ifjoin(obj,^)=join(var2,^)then
equal=true
else
equal=false
endif
else
ifobj=var2then
equal=true
else
equal=false
endif
endif
endfunction
endclass
%>