實踐xml緩存技術構建高性能web站點

2019-11-17 04:29:04

字體：大中小

來源：轉載

供稿：網友

打造一個高性能穩定的web站點一直是站長和程序員的夢想，本文用作者的一次親身經歷的來說說如何利用xml緩存技術實現站點的高性能。我是從今年開始做138手機主題網的，采用SQL2000做為數據庫，開發語言用的是asp，查詢的時候都是動態查詢，直接用like %的方式，那個時候反正一天的訪問量小，同時在線的時候也就幾十個人而已，所以服務器也就能勝任要求，隨著訪問量慢慢增加，當同時在線達到幾百人時，此時服務器開始不堪重負，CPU常常達到100%不降，網頁打開速度也超級慢，一個查詢頁面需要幾秒鐘甚至更長，于是我開始考慮優化程序和數據庫，數據庫建立索引，不是很理想，因為用的是like '% 這種方式，于是我想到了緩存，而xml本身的特點決定了他非常適合做數據庫的緩存，好東西不敢獨享，特發布出來，以便同行交流，共同進步。
實現的思路是這樣的：程序讀取信息時，先判斷是否緩存了xml數據，如果有，則直接從xml中讀取信息，否則從數據庫中讀取，并將此次結果生成xml文件，以便以后調用，加快速度，同時判斷xml緩存文件是否過期，如果過期則需要重新生成xml。下面是具體的代碼。
xmlcachecls.asp
<%
Rem xml數據緩存類
'--------------------------------------------------
'轉載的時候請保留版權信息
'作者:walkman
'網址:手機主題 Class XmlCacheCls
Rem 私有變量定義
 PRivate m_CacheTime '緩存時間，單位秒
Private m_PageSize '每頁大小
Private m_CachePageNum 'xml緩存頁大小
Private m_XmlFile 'xml路徑，用絕對地址,不需要加擴展名
Private m_Sql 'SQL語句
Private m_TableName '表名或者視圖名
Private m_Columns '列名用,隔開
Private m_CurPage '當前頁
Private m_CacheType '緩存類型：1,列表 2,詳情
Private m_DataConn '數據源,必須已經打開
Private m_QueryType '查詢類型：1,直接用sql 2,用存儲過程
Private m_SQLArr '返回的數據數組
Private m_RecordCount

Rem 公共屬性
'緩存時間
Public Property Let CacheTime(v)
m_CacheTime = v
End Property
Public Property Get CacheTime
CacheTime = m_CacheTime
End Property

'每頁大小
Public Property Let PageSize(v)
m_PageSize = v
End Property
Public Property Get PageSize
PageSize = m_PageSize
End Property

'xml緩存頁大小
Public Property Let CachePageNum(v)
m_CachePageNum = v
End Property
Public Property Get CachePageNum
CachePageNum = m_CachePageNum
End Property

'xml路徑，用絕對地址
Public Property Let XmlFile(v)
m_XmlFile = v
End Property
Public Property Get XmlFile
XmlFile = m_XmlFile
End Property

'xml路徑，用絕對地址
'http://www.49028c.com/article.asp?typeid=2
Public Property Let Sql(v)
m_Sql = v
End Property
Public Property Get Sql
Sql = m_Sql
End Property

'表名或者視圖名
Public Property Let TableName(v)
m_TableName = v
End Property
Public Property Get TableName
TableName = m_TableName
End Property

'列名用,隔開
Public Property Let Columns(v)
m_Columns = v
End Property
Public Property Get Columns
Columns = m_Columns
End Property

'當前頁
Public Property Let CurPage(v)
m_CurPage = v
End Property
Public Property Get CurPage
CurPage = m_CurPage
End Property

'緩存類型：1,列表 2,詳情
Public Property Let CacheType(v)
m_CacheType = v
End Property
Public Property Get CacheType
CacheType = m_CacheType
End Property

'緩存類型：1,列表 2,詳情
Public Property Set Conn(v)
Set m_DataConn = v
End Property
Public Property Get Conn
Conn = m_DataConn
End Property

'返回記錄總數
Public Property Get RecordCount
RecordCount = m_RecordCount
End Property
'返回記錄數組
'http://www.devdao.com/
Public Property Get SQLArr
SQLArr = m_SQLArr
End Property

Rem 公共方法讀取數據
Public Function ReadData
If m_CacheType = 1 Then
   ReadListAndSearchData
Else
   ReadContentData
End If
End Function

Rem 讀取詳情信息
Private Function ReadContentData
Dim xmlfile
xmlfile = m_XmlFile
If fsoExistsFile(xmlfile) Then '存在xml緩存，直接從xml中讀取
   ReadContentDataFromXml xmlfile
Else
   ReadContentDataFromDB
End If
End Function

Rem 從xml文件讀取詳情信息
Private Function ReadContentDataFromXml(xmlfile)
Dim SQLARR()
Dim XmlDoc
Set XmlDoc = Server.CreateObject("msxml2.FreeThreadedDOMDocument.3.0")
XmlDoc.Load xmlfile
Dim itemslength,itemsi
itemslength = XmlDoc.documentElement.childNodes.length
For itemsi=0 To itemslength-1
   ReDim Preserve SQLARR(itemslength-1,0)
   SQLARR(itemsi,0) = XmlDoc.documentElement.childNodes(itemsi).text
Next
Set XmlDoc = Nothing
m_SQLArr = SQLArr
End Function

Rem 從Db中讀取詳情信息
Private Function ReadContentDataFromDB()
Dim rs
Dim SQLARR
Set rs = m_DataConn.execute(m_sql)
IF Not Rs.eof Then
   SQLArr=Rs.GetRows(1)
   rs.close
   Set rs = Nothing
Else
   rs.close
   Set rs = Nothing
   Exit Function
End If
m_SQLArr = SQLArr
End Function

Rem 讀取列表數據
Private Function ReadListAndSearchData
Dim sPagesize,TotalPage,CurPage,TotalRec
sPagesize = m_PageSize * m_CachePageNum
m_CurPage = CLng(m_CurPage)

If m_CurPage Mod m_CachePageNum = 0 Then
   CurPage = m_CurPage/m_CachePageNum
Else
   CurPage = int(clng(m_CurPage)/m_CachePageNum)+1
End If
Dim xmlfile
xmlfile = getXmlFileName(CurPage)
If FSOExistsFile(xmlfile) Then '存在xml緩存，直接從xml中讀取
   ReadListAndSearchDataFromXml xmlfile
Else
   ReadListAndSearchDataFromDB
End If
End Function
Rem 從xml中讀列表數據
Private Function ReadListAndSearchDataFromXml(xmlfile)
Dim SQLARR()
Dim XmlDoc
Set XmlDoc = Server.CreateObject("msxml2.FreeThreadedDOMDocument.3.0")
XmlDoc.Load xmlfile
Dim totalrecont
totalrecont = XmlDoc.documentElement.selectSingleNode("totalrec").text
m_RecordCount = totalrecont
Dim TotalRec
TotalRec = m_RecordCount
If totalrecont = 0 Then
   Set XmlDoc = Nothing
   m_SQLArr = SQLARR
   Exit Function
End If
Dim TotalPage,curpage
curpage = m_CurPage
If m_CurPage Mod m_CachePageNum = 0 Then
   CurPage = m_CurPage/m_CachePageNum
Else
   CurPage = int(clng(m_CurPage)/m_CachePageNum)+1
End If
If TotalRec Mod m_CachePageNum =0 Then
   TotalPage = totalrecont/m_CachePageNum
Else
   TotalPage = int(clng(totalrecont)/m_CachePageNum)+1
End If

If curpage>TotalPage Then curpage=TotalPage
Dim starti
Dim startn
startn = m_curpage - (curpage-1) * m_CachePageNum
Rem 計算開始位置
starti = (startn-1) * m_pagesize
Dim items,item
Set items = XmlDoc.documentElement.SelectNodes("item")
Dim i
Dim num
Dim length
length = items.length
num = 0
For i = starti To m_PageSize + starti -1
   If i >=length Then Exit For
   Set item = items(i)
   Dim attrlength
   attrlength = item.attributes.length
   ReDim Preserve SQLARR(attrlength,num)
   Dim Attribute
   Dim Attributei
   Attributei = 0
   For Attributei = 0 To attrlength-1
    SQLArr(Attributei,num) = item.attributes(Attributei).Nodevalue
   Next
   num = num + 1
Next
Set XmlDoc = Nothing
m_SQLArr = SQLArr
End Function

Rem 從DB中讀列表數據
Private Function ReadListAndSearchDataFromDB
Dim rs,TotalRec,CurPage
CurPage = m_CurPage
Set Rs = Server.CreateObject("Adodb.Recordset")
Rs.open m_sql,m_DataConn,1
TotalRec = rs.recordcount
m_RecordCount = TotalRec
rs.pagesize = m_PageSize
If CurPage>rs.PageCount Then CurPage = rs.PageCount
If Not rs.eof Then rs.absolutePage=m_CurPage
Dim SQLARR()
Dim k
k = 0
While Not rs.eof and k<m_PageSize
   Dim fieldlegth
   fieldlegth = rs.Fields.count
   ReDim Preserve SQLARR(fieldlegth,k)

   Dim fieldi
   For fieldi = 0 To fieldlegth-1
    SQLArr(fieldi,k) = rs.Fields(fieldi).value
   Next
   rs.movenext
   k=k+1
Wend
rs.close
Set rs = Nothing
m_SQLArr = SQLArr
End Function

Rem 獲取xml文件名稱
Private Function getXmlFileName(num)
Dim tmpstr
tmpstr = LCase(m_XmlFile)
If Right(tmpstr,4) = ".xml" Then
   tmpstr = Left(tmpstr,Len(tmpstr)-Len(".xml"))
End If
tmpstr = Replace(tmpstr,"%","_")
tmpstr = tmpstr & "_" & num & ".xml"
getXmlFileName = tmpstr
End Function

Rem 公共方法將數據寫入xml文件
Public Function WriteDataToXml
If m_CacheType = 1 Then
   WriteListAndSearchDataToXml
Else
   WriteContentDataToXml
End If
End Function

Rem 寫具體某條信息的詳情xml
Private Function WriteContentDataToXml
Rem xml未過期則直接退出
Dim xmlfile
xmlfile = m_XmlFile
If FSOExistsFile(xmlfile) Then
If Not isXmlCacheExpired(xmlfile,m_CacheTime) Then Exit Function
End If
Dim rs
Set rs = Server.CreateObject("Adodb.Recordset")
Rs.open m_sql,m_DataConn
CreateContentXmlFile xmlfile,Rs
End Function

Rem 列表和搜索xml數據
Private Function WriteListAndSearchDataToXml

Dim sPagesize,TotalPage,CurPage,TotalRec
sPagesize = m_PageSize * m_CachePageNum
m_CurPage = CLng(m_CurPage)

If m_CurPage Mod m_CachePageNum = 0 Then
   CurPage = m_CurPage/m_CachePageNum
Else
   CurPage = int(clng(m_CurPage)/m_CachePageNum)+1
End If
Dim xmlfile
xmlfile = getXmlFileName(CurPage)
Rem 如果xml未過期則直接退出
If FSOExistsFile(xmlfile) Then
   If Not isXmlCacheExpired(xmlfile,m_CacheTime) Then Exit Function
End If
Dim rs
Set Rs = Server.CreateObject("Adodb.Recordset")
Rs.open m_sql,m_DataConn,1
TotalRec = rs.recordcount
rs.pagesize = sPagesize
If CurPage>rs.PageCount Then CurPage = rs.PageCount
CreateListAndSearchXMLFile xmlfile,TotalRec,Rs,sPagesize
End Function

Rem 私有方法
Rem 得到文件的最后修改時間
Private Function FSOGetFileLastModifiedTime(file)
Dim fso,f,s
Set fso=CreateObject("Scr Set f=fso.GetFile(file)
FSOGetFileLastModifiedTime = f.DateLastModified
Set f = Nothing
Set fso = Nothing
End Function

Rem 判斷xml緩存是否到期
Private Function isXmlCacheExpired(file,seconds)
Dim filelasttime
filelasttime = FSOGetFileLastModifiedTime(file)
If DateAdd("s",seconds,filelasttime) < Now Then
   isXmlCacheExpired = True
Else
   isXmlCacheExpired = False
End If
End Function
Rem 文件是否存在
Private Function FSOExistsFile(file)
Dim fso
Set fso = Server.CreateObject("Scripting.FileSystemObject")
If fso.FileExists(file) Then
   FSOExistsFile = true
Else
   FSOExistsFile = false
End If
Set fso = nothing
End Function

Rem 生成詳細數據的xml
Private Function CreateContentXmlFile(xmlfile,Rs)
Dim xmlcontent
xmlcontent = "<?xml version=""1.0"" encoding=""gb2312""?>" & vbnewline
xmlcontent = xmlcontent & "<root>" & vbnewline

Dim field
For Each field In rs.Fields
   xmlcontent = xmlcontent & "<"&field.name&">"
   Dim value
   value = field.value
   If TypeName(value) = "String" Then
    xmlcontent = xmlcontent & "<![CDATA[" & Trim(value) & "]]>"
   Else
    xmlcontent = xmlcontent & Trim(value)
   End If
   xmlcontent = xmlcontent & "</"&field.name&">" & vbnewline
Next
rs.close
Set rs = Nothing
xmlcontent = xmlcontent & "</root>" & vbnewline

Dim folderpath
folderpath = Trim(left(xmlfile,InstrRev(xmlfile,"/")-1))
Call CreateDIR(folderpath&"") '創建文件夾
WriteStringToXMLFile xmlfile,xmlcontent
End Function

Rem 生成列表的xml
Private Function CreateListAndSearchXMLFile(xmlfile,TotalRec,Rs,sPagesize)
Dim xmlcontent
xmlcontent = ""
xmlcontent = xmlcontent & "<?xml version=""1.0"" encoding=""gb2312""?>" & vbnewline
xmlcontent = xmlcontent & " <root>" & vbnewline
xmlcontent = xmlcontent & " <totalrec>" & TotalRec & "</totalrec>" & vbnewline
Dim k
k = 0
Dim field
While Not rs.eof and k<sPagesize
   xmlcontent = xmlcontent & " <item "
   For Each field In rs.Fields
    xmlcontent = xmlcontent & field.name & "=""" & XMLStringEnCode(field.value) & """ "
   Next
   xmlcontent = xmlcontent & "></item>" & vbnewline
   rs.movenext
   k=k+1
Wend
rs.close
Set rs = Nothing
xmlcontent = xmlcontent & " </root>" & vbnewline
Dim folderpath
folderpath = Trim(left(xmlfile,InstrRev(xmlfile,"/")-1))
Call CreateDIR(folderpath&"") '創建文件夾
WriteStringToXMLFile xmlfile,xmlcontent
End Function
Rem xml轉義字符
Private Function XMLStringEnCode(str)
If str&"" = "" Then XMLStringEnCode="":Exit Function
str = Replace(str,"<","<")
str = Replace(str,">",">")
str = Replace(str,"'","'")
str = Replace(str,"""",""")
str = Replace(str,"&","&")
XMLStringEnCode = str
End Function
Rem 寫文件
Private Sub WriteStringToXMLFile(filename,str)
'On Error Resume Next
Dim fs,ts
Set fs= createobject("scripting.filesystemobject")
If Not IsObject(fs) Then Exit Sub
Set ts=fs.OpenTextFile(filename,2,True)
ts.writeline(str)
ts.close
Set ts=Nothing
Set fs=Nothing
End Sub

Rem 創建文件夾
Private function CreateDIR(byval LocalPath)
On Error Resume Next
Dim i,FileObject,patharr,path_level,pathtmp,cpath
LocalPath = Replace(LocalPath,"/","/")
Set FileObject = server.createobject("Scripting.FileSystemObject")
patharr = Split(LocalPath,"/")
path_level = UBound (patharr)
For i = 0 To path_level
   If i=0 Then
    pathtmp=patharr(0) & "/"
   Else
    pathtmp = pathtmp & patharr(i) & "/"
   End If
   cpath = left(pathtmp,len(pathtmp)-1)
   If Not FileObject.FolderExists(cpath) Then
    'Response.write cpath
    FileObject.CreateFolder cpath
   End If
Next
Set FileObject = Nothing
If err.number<>0 Then
   CreateDIR = False
   err.Clear
Else
   CreateDIR = True
End If
End Function
End Class
%>

此類包含兩種緩存方式：一種是基于列表方式的，如按照某個類別顯示信息、搜索某個關鍵詞進行顯示；另外一種是詳細頁面的緩存，如顯示具體的某篇文章。
此類與具體的業務邏輯無關，只負責xml數據的讀取和存儲，判斷是否緩存過期決定是否需要更新緩存。按照三層構架模式的話，它處于數據訪問層。

調用這個類的代碼：
Business.asp
<%
Rem xml數據緩存類業務邏輯層代碼
'--------------------------------------------------
'轉載的時候請保留版權信息
'作者:walkman
'網址:手機主題 Rem 根據classid取列表數據
Function GetListarr(classid,curpage,PageSize,CachePageNum,ByRef RecordCount)
openConn
Dim sql
sql = "select thmid,thmname,picfileurl,win_theme.adddate from win_theme where win_theme.ClassID="&classid&" order by thmid desc"
Dim cache
Set cache = new XmlCacheCls
cache.PageSize = PageSize '每頁N條記錄
cache.CachePageNum = CachePageNum '一個xml文件緩存M頁的數據量
cache.XmlFile = Server.Mappath("xmlcache/classxml/list_"&classid&".xml")
cache.Sql = sql
cache.CurPage = curpage
cache.CacheType = 1
Set cache.Conn = conn
cache.ReadData
Dim SqlArr
SQLArr = cache.SQLArr
RecordCount = cache.RecordCount
Set cache = Nothing
GetListarr = SqlArr
End Function

Rem 根據classid生成xml緩存
Function CreateListxml(classid,curpage,PageSize,CachePageNum,CacheTime)
Dim sql
sql = "select thmid,thmname,picfileurl,win_theme.adddate from win_theme where win_theme.ClassID="&classid&" order by thmid desc"
Dim cache
Set cache = new XmlCacheCls
cache.CacheTime = CacheTime '緩存時間
cache.PageSize = PageSize '每頁N條記錄
cache.CachePageNum = CachePageNum '一個xml文件緩存M頁的數據量
cache.XmlFile = Server.Mappath("xmlcache/classxml/list_"&classid&".xml")
cache.Sql = sql
cache.CurPage = curpage
cache.CacheType = 1
Set cache.Conn = conn
cache.WriteDataToXml
Set cache = Nothing
End Function

Rem 根據key Word取列表數據
Function GetSearcharr(keyword,curpage,PageSize,CachePageNum,ByRef RecordCount)
openConn
Dim sql
Dim sqlkey
sqlkey = Replace(keyword,"'","")
sql = "select thmid,thmname,picfileurl,win_theme.adddate from win_theme where ThmName like '%"&sqlkey&"%' or ThmRange like '%"&sqlkey&"%' or ThmInstro like '%"&sqlkey&"%' order by thmid desc"
Dim cache
Set cache = new XmlCacheCls
cache.PageSize = PageSize     '每頁N條記錄
cache.CachePageNum = CachePageNum    '一個xml文件緩存M頁的數據量
cache.XmlFile = Server.Mappath("xmlcache/searchxml/list_"&Server.URlEncode(Replace(keyword,"'",""))&".xml")
cache.Sql = sql
cache.CurPage = curpage
cache.CacheType = 1
Set cache.Conn = conn
cache.ReadData
Dim SqlArr
SQLArr = cache.SQLArr
RecordCount = cache.RecordCount
Set cache = Nothing
GetSearcharr = SqlArr
End Function

Rem 根據keyword生成xml緩存
Function CreateSearchxml(keyword,curpage,PageSize,CachePageNum,CacheTime)
Dim sql
Dim sqlkey
sqlkey = Replace(keyword,"'","")
sql = "select thmid,thmname,picfileurl,win_theme.adddate from win_theme where ThmName like '%"&sqlkey&"%' or ThmRange like '%"&sqlkey&"%' or ThmInstro like '%"&sqlkey&"%' order by thmid desc"
Dim cache
Set cache = new XmlCacheCls
cache.CacheTime = CacheTime '緩存時間
cache.PageSize = PageSize     '每頁N條記錄
cache.CachePageNum = CachePageNum    '一個xml文件緩存M頁的數據量
cache.XmlFile = Server.Mappath("xmlcache/searchxml/list_"&Server.URlEncode(Replace(keyword,"'",""))&".xml")
cache.Sql = sql
cache.CurPage = curpage
cache.CacheType = 1
Set cache.Conn = conn
cache.WriteDataToXml
Set cache = Nothing
End Function
Rem 根據classid取列表數據
Function GetDetailarr(thmid)
openConn
Dim sql
sql = "select a.thmid,a.thmname,a.classid,b.classname,a.picfileurl,a.thmver,a.thmsize,a.thminstro,a.thmrange,a.thmfileurl,a.adddate from win_theme a,Win_Classify b where a.classid=b.classid and a.thmid="&thmid&""
Dim thmidmod
thmidmod = thmid Mod 100

Dim cache
Set cache = new XmlCacheCls
cache.XmlFile = Server.Mappath("xmlcache/detailxml/"&thmidmod&"/"&thmid&".xml")
cache.Sql = sql
cache.CacheType = 2
Set cache.Conn = conn
cache.ReadData
Dim SqlArr
SQLArr = cache.SQLArr
Set cache = Nothing
GetDetailarr = SqlArr
End Function
Rem 根據keyword生成xml緩存
Function CreateDetailxml(thmid,CacheTime)
Dim sql
sql = "select a.thmid,a.thmname,a.classid,b.classname,a.picfileurl,a.thmver,a.thmsize,a.thminstro,a.thmrange,a.thmfileurl,a.adddate from win_theme a,Win_Classify b where a.classid=b.classid and a.thmid="&thmid&""
Dim thmidmod
thmidmod = thmid Mod 100
Dim cache
Set cache = new XmlCacheCls
cache.CacheTime = CacheTime '緩存時間
cache.XmlFile = Server.Mappath("xmlcache/detailxml/"&thmidmod&"/"&thmid&".xml")
cache.Sql = sql
cache.CacheType = 2
Set cache.Conn = conn
cache.WriteDataToXml
Set cache = Nothing
End Function

Rem 檢測動態數組是否已分配
Function   ismalloc(a)
On   Error Resume Next
Dim   i
i   =   UBound(a)
If Err Then
ismalloc = False
Else
ismalloc   =   True
End If
End   Function

Function showData(SQLArr)
If Not ismalloc(SQLArr) Then Exit Function
Dim i,k
Dim num
num = 0
i = UBound(SQLArr,1)
k = UBound(SQLArr,2)
Dim m,n
For m = 0 To k
num = num+1
%>
<ul class="listbox" onMouSEOver="overtb(this)" onMouseOut="outtb(this)">
<li>
<a title="<%=SQLArr(1,m)%>" href="detail.asp?id=<%=SQLArr(0,m)%>" target="_blank">
<img height="140" alt="<%=SQLArr(1,m)%>" src="</li>
<li class="green bold">
<a title="<%=SQLArr(1,m)%>" href="detail.asp?id=<%=SQLArr(0,m)%>" target="_blank">
<%=walkgottopic(Trim(SQLArr(1,m)),18)%></a>
</li>
<li><%=DateValue(SQLArr(3,m))%></li>
</ul>
<%
next
End Function
%>
這個文件是業務邏輯層代碼，負責根據不同的業務邏輯來實現xml數據的讀取和寫入，并提供接口方法給web表現層調用。
具體的調用代碼：
list.asp
只顯示相關代碼。
<%
。。。。。。
Dim classid
classid = Request("classid")
If classid = "" Or (Not IsNumeric(classid)) Then Response.write "參數錯誤！":Response.End()
classid = CLng(classid)
Dim sPagesize,TotalPage,CurPage,TotalRec,CachePageNum
sPagesize = 20
CachePageNum = 10
CurPage = Trim(Request("page"))
IF CurPage="" Or (Not IsNumeric(CurPage)) Then
CurPage=1
Else
CurPage=Clng(CurPage)
End IF
Dim myarr
myarr = GetListarr(classid,CurPage,sPagesize,CachePageNum,TotalRec)
'總頁數
TotalPage = int(clng(TotalRec)/sPagesize*-1)*-1
If Clng(TotalRec)>0 Then
showData myarr
End If
................
%>
最后在頁面最底部調用一個asp的script語句來更新xml緩存。
<script type="text/javascript" src="setcache.asp?action=list&curpage=<%=curpage%>&classid=<%=classid%>"></script>

setcache.asp
相關代碼
<%
openconn
Dim action
action = Trim(Request("action"))&""
Dim curpage
curpage = Request("curpage")
Dim classid
Dim keyword
Dim thmid
If action = "list" Then
classid = Request("classid")
If classid="" Or (Not IsNumeric(classid)) Or curpage="" Or (Not IsNumeric(curpage)) Then
Else
CreateListxml CLng(classid),CLng(curpage),20,10,60 * 60 * 2 '創建分類的xml
End If
ElseIf action = "search" Then
keyword = Trim(Request("keyword"))
If keyword="" Then
Else
CreateSearchxml keyword,CLng(curpage),20,10,60 * 60 * 2 '創建搜索的xml
End If
ElseIf action = "detail" Then
thmid = Request("id")
If thmid="" Or (Not IsNumeric(thmid)) Then
Else
CreateDetailxml CLng(thmid),60 * 60 * 2 '創建詳情的xml
End If
End If
Call Closeconn
Response.write " "
Response.End
%>
至此，核心代碼都分享出來了，實踐證明，通過這樣的方式，我的138手機主題網的服務器的CPU占用率和內存占用率明顯下降，訪問速度也明顯提高，從以前的需要幾秒甚至10多秒，到現在只需要10幾毫秒。
為了方便大家理解其中的代碼，我特地做了一個demo，供同行學習交流。地址：http://www.shouji138.com/aspnet2/demo
此例程的完整下載包：http://www.shouji138.com/aspnet2/demo/xmlcachedemo.rar
本人QQ:441003232 歡迎大家交流共同進步。
也可以訪問本人的小站：手機主題:http://www.shouji138.com