簡(jiǎn)單介紹:一般一個(gè)網(wǎng)站的首頁(yè)訪問量是最大的,如果您的網(wǎng)站的首頁(yè)打開的非常緩慢,您的客戶將會(huì)陸續(xù)離開你的網(wǎng)站.通常我們把需要經(jīng)過復(fù)雜運(yùn)算或者查詢數(shù)據(jù)庫(kù)得出的數(shù)據(jù)緩存起來或者生成靜態(tài)網(wǎng)頁(yè)來提高web應(yīng)用的性能,這次我們直接把首頁(yè)的輸出緩存成一個(gè)字符串,然后定時(shí)更新,即照顧了性能,又不影響首頁(yè)的時(shí)效性.這里用到了一些VBS自定義類,Application對(duì)象,XmlHttp對(duì)象,adodb.stream對(duì)象的一些東西,相關(guān)知識(shí)大家可以查資料了解.
最好讓這個(gè)頁(yè)和你要緩存的頁(yè)在一個(gè)目錄下,要不有些相對(duì)路徑的圖片就無法顯示了,另外緩存有的頁(yè)面會(huì)出現(xiàn)亂碼,我還不知道怎么解決這個(gè)問題呢,可能在Response的時(shí)候需要設(shè)置一下編碼類型,大家可以試試
復(fù)制代碼 代碼如下:
%
Dim wawa,StarTime,EndTime
StarTime=Timer()
Set wawa=new Cls_Cache
wawa.Reloadtime=0.5
wawa.CacheName="wawa"
wawa.Name="XmlInfoIndex"
If wawa.ObjIsEmpty() Then CacheXmlInfoIndex()
Response.Write wawa.value
EndTime=Timer()
Response.Write "br>執(zhí)行時(shí)間：" FormatNumber((Endtime-StarTime)*1000,5) "毫秒。"
Sub CacheXmlInfoIndex()
Dim BodyText, xml
Set xml = Server.CreateObject("Microsoft.XMLHTTP")
'把下面的地址替換成你的首頁(yè)的文件地址,一定要用http://開頭的絕對(duì)路徑,不能寫相對(duì)路徑
xml.Open "GET", "http://onlytiancai/bak/vote/InfoIndex.asp", False
xml.Send
BodyText=xml.ResponseBody
BodyText=BytesToBstr(BodyText,"gb2312")
wawa.Value=BodyText
Set xml = Nothing
End Sub
Function BytesToBstr(body,Cset)
dim objstream
set objstream = Server.CreateObject("adodb.stream")
objstream.Type = 1
objstream.Mode =3
objstream.Open
objstream.Write body
objstream.Position = 0
objstream.Type = 2
objstream.Charset = Cset
BytesToBstr = objstream.ReadText
objstream.Close
set objstream = nothing
End Function
%>
%
'下面這個(gè)類可以保存在單獨(dú)的文件里,然后包含到此頁(yè)
Class Cls_Cache
Rem ==================使用說明==============================================
Rem = 本類模塊是動(dòng)網(wǎng)先鋒原創(chuàng)，作者：迷城浪子。如采用本類模塊，請(qǐng)不要去掉這個(gè)說明。這段注釋不會(huì)影響執(zhí)行的速度。=
Rem = 作用：緩存和緩存管理類 =
Rem = 公有變量：Reloadtime 過期時(shí)間（單位為分鐘）缺省值為14400, =
Rem = MaxCount 緩存對(duì)象的最大值，超過則自動(dòng)刪除使用次數(shù)少的對(duì)象。缺省值為300 =
Rem = CacheName 緩存組的總名稱，缺省值為"Dvbbs",如果一個(gè)站點(diǎn)中有超過一個(gè)緩存組，則需要外部改變這個(gè)值。 =
Rem = 屬性:Name 定義緩存對(duì)象名稱，只寫屬性。 =
Rem = 屬性:value 讀取和寫入緩存數(shù)據(jù)。 =
Rem = 函數(shù)：ObjIsEmpty()判斷當(dāng)前緩存是否過期。 =
Rem = 方法：DelCahe(MyCaheName)手工刪除一個(gè)緩存對(duì)象，參數(shù)是緩存對(duì)象的名稱。 =
Rem ================================================================
Public Reloadtime,MaxCount,CacheName
Private LocalCacheName,CacheData,DelCount
Private Sub Class_Initialize()
Reloadtime=14400
CacheName="Dvbbs"
End Sub
Private Sub SetCache(SetName,NewValue)
Application.Lock
Application(SetName) = NewValue
Application.unLock
End Sub
Private Sub makeEmpty(SetName)
Application.Lock
Application(SetName) = Empty
Application.unLock
End Sub
Public Property Let Name(ByVal vNewValue)
LocalCacheName=LCase(vNewValue)
End Property
Public Property Let Value(ByVal vNewValue)
If LocalCacheName>"" Then
CacheData=Application(CacheName"_"LocalCacheName)
If IsArray(CacheData) Then
CacheData(0)=vNewValue
CacheData(1)=Now()
Else
ReDim CacheData(2)
CacheData(0)=vNewValue
CacheData(1)=Now()
End If
SetCache CacheName"_"LocalCacheName,CacheData
Else
Err.Raise vbObjectError + 1, "DvbbsCacheServer", " please change the CacheName."
End If
End Property
Public Property Get Value()
If LocalCacheName>"" Then
CacheData=Application(CacheName"_"LocalCacheName)
If IsArray(CacheData) Then
Value=CacheData(0)
Else
Err.Raise vbObjectError + 1, "DvbbsCacheServer", " The CacheData Is Empty."
End If
Else
Err.Raise vbObjectError + 1, "DvbbsCacheServer", " please change the CacheName."
End If
End Property
Public Function ObjIsEmpty()
ObjIsEmpty=True
CacheData=Application(CacheName"_"LocalCacheName)
If Not IsArray(CacheData) Then Exit Function
If Not IsDate(CacheData(1)) Then Exit Function
If DateDiff("s",CDate(CacheData(1)),Now()) 60*Reloadtime Then
ObjIsEmpty=False
End If
End Function
Public Sub DelCahe(MyCaheName)
makeEmpty(CacheName"_"MyCaheName)
End Sub
End Class
%>
