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实践xml缓存技术构建高性能web站点

来源:互联网  宽屏版  评论
2008-09-23 07:48:05

打造一个高性能稳定的web站点一直是站长和程序员的梦想,本文用作者的一次亲身经历的来说说如何利用xml缓存技术实现站点的高性能。我是从今年开始做138手机主题网的,采用SQL2000做为数据库,开发语言用的是Asp,查询的时候都是动态查询,直接用like %的方式,那个时候反正一天的访问量小,同时在线的时候也就几十个人而已,所以服务器也就能胜任要求,随着访问量慢慢增加,当同时在线达到几百人时,此时服务器开始不堪重负,CPU常常达到100%不降,网页打开速度也超级慢,一个查询页面需要几秒钟甚至更长,于是我开始考虑优化程序和数据库,数据库建立索引,不是很理想,因为用的是like '% 这种方式,于是我想到了缓存,而xml本身的特点决定了他非常适合做数据库的缓存,好东西不敢独享,特发布出来,以便同行交流,共同进步。

实现的思路是这样的:程序读取信息时,先判断是否缓存了xml数据,如果有,则直接从xml中读取信息,否则从数据库中读取,并将此次结果生成xml文件,以便以后调用,加快速度,同时判断xml缓存文件是否过期,如果过期则需要重新生成xml。下面是具体的代码。

xmlcachecls.asp

<%

Rem xml数据缓存类

'--------------------------------------------------

'转载的时候请保留版权信息

'作者:walkman

'网址:手机主题 http://www.shouji138.com

'版本:ver1.0

'欢迎各位交流进步

'--------------------------------------------------

Class XmlCacheCls

Rem 私有变量定义

Private m_CacheTime '缓存时间,单位秒

Private m_PageSize '每页大小

Private m_CachePageNum 'xml缓存页大小

Private m_XmlFile 'xml路径,用绝对地址,不需要加扩展名

Private m_Sql 'SQL语句

Private m_TableName '表名或者视图名

Private m_Columns '列名 用,隔开

Private m_CurPage '当前页

Private m_CacheType '缓存类型:1,列表 2,详情

Private m_DataConn '数据源,必须已经打开

Private m_QueryType '查询类型:1,直接用sql 2,用存储过程

Private m_SQLArr '返回的数据数组

Private m_RecordCount

Rem 公共属性

'缓存时间

Public Property Let CacheTime(v)

m_CacheTime = v

End Property

Public Property Get CacheTime

CacheTime = m_CacheTime

End Property

'每页大小

Public Property Let PageSize(v)

m_PageSize = v

End Property

Public Property Get PageSize

PageSize = m_PageSize

End Property

'xml缓存页大小

Public Property Let CachePageNum(v)

m_CachePageNum = v

End Property

Public Property Get CachePageNum

CachePageNum = m_CachePageNum

End Property

'xml路径,用绝对地址

Public Property Let XmlFile(v)

m_XmlFile = v

End Property

Public Property Get XmlFile

XmlFile = m_XmlFile

End Property

'xml路径,用绝对地址

'http://www.knowsky.com/article.asp?typeid=2

Public Property Let Sql(v)

m_Sql = v

End Property

Public Property Get Sql

Sql = m_Sql

End Property

'表名或者视图名

Public Property Let TableName(v)

m_TableName = v

End Property

Public Property Get TableName

TableName = m_TableName

End Property

'列名 用,隔开

Public Property Let Columns(v)

m_Columns = v

End Property

Public Property Get Columns

Columns = m_Columns

End Property

'当前页

Public Property Let CurPage(v)

m_CurPage = v

End Property

Public Property Get CurPage

CurPage = m_CurPage

End Property

'缓存类型:1,列表 2,详情

Public Property Let CacheType(v)

m_CacheType = v

End Property

Public Property Get CacheType

CacheType = m_CacheType

End Property

'缓存类型:1,列表 2,详情

Public Property Set Conn(v)

Set m_DataConn = v

End Property

Public Property Get Conn

Conn = m_DataConn

End Property

'返回记录总数

Public Property Get RecordCount

RecordCount = m_RecordCount

End Property

'返回记录数组

'http://www.devdao.com/

Public Property Get SQLArr

SQLArr = m_SQLArr

End Property

Rem 公共方法 读取数据

Public Function ReadData

If m_CacheType = 1 Then

ReadListAndSearchData

Else

ReadContentData

End If

End Function

Rem 读取详情信息

Private Function ReadContentData

Dim xmlfile

xmlfile = m_XmlFile

If FSOExistsFile(xmlfile) Then '存在xml缓存,直接从xml中读取

ReadContentDataFromXml xmlfile

Else

ReadContentDataFromDB

End If

End Function

Rem 从xml文件读取详情信息

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 从Db中读取详情信息

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 读取列表数据

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缓存,直接从xml中读取

ReadListAndSearchDataFromXml xmlfile

Else

ReadListAndSearchDataFromDB

End If

End Function

Rem 从xml中读列表数据

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 计算开始位置

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 从DB中读列表数据

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 获取xml文件名称

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 将数据写入xml文件

Public Function WriteDataToXml

If m_CacheType = 1 Then

WriteListAndSearchDataToXml

Else

WriteContentDataToXml

End If

End Function

Rem 写具体某条信息的详情xml

Private Function WriteContentDataToXml

Rem xml未过期则直接退出

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数据

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未过期则直接退出

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时间

Private Function FSOGetFileLastModifiedTime(file)

Dim fso,f,s

Set fso=CreateObject("Scripting.FileSystemObject")

Set f=fso.GetFile(file)

FSOGetFileLastModifiedTime = f.DateLastModified

Set f = Nothing

Set fso = Nothing

End Function

Rem 判断xml缓存是否到期

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 生成详细数据的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&"") '创建文件夹

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&"") '创建文件夹

WriteStringToXMLFile xmlfile,xmlcontent

End Function

Rem xml转义字符

Private Function XMLStringEnCode(str)

If str&"" = "" Then XMLStringEnCode="":Exit Function

str = Replace(str,"<","&lt;")

str = Replace(str,">","&gt;")

str = Replace(str,"'","&apos;")

str = Replace(str,"""","&quot;")

str = Replace(str,"&","&amp;")

XMLStringEnCode = str

End Function

Rem 写文件

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 创建文件夹

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

%>

此类包含两种缓存方式:一种是基于列表方式的,如按照某个类别显示信息、搜索某个关键词进行显示;另外一种是详细页面的缓存,如显示具体的某篇文章。

此类与具体的业务逻辑无关,只负责xml数据的读取和存储,判断是否缓存过期决定是否需要更新缓存。按照三层构架模式的话,它处于数据访问层。

调用这个类的代码:

Business.asp

<%

Rem xml数据缓存类业务逻辑层代码

'--------------------------------------------------

'转载的时候请保留版权信息

'作者:walkman

'网址:手机主题 http://www.shouji138.com

'版本:ver1.0

'欢迎各位交流进步

'--------------------------------------------------

Rem 根据classid取列表数据

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 '每页N条记录

cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量

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 根据classid生成xml缓存

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 '缓存时间

cache.PageSize = PageSize '每页N条记录

cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量

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 根据keyword取列表数据

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 '每页N条记录

cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量

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 根据keyword生成xml缓存

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 '缓存时间

cache.PageSize = PageSize '每页N条记录

cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量

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 根据classid取列表数据

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 根据keyword生成xml缓存

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 '缓存时间

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 检测动态数组是否已分配

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="http://www.shouji138.com<%=SQLArr(2,m)%>" width="107" border="0"></a>

</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

%>

这个文件是业务逻辑层代码,负责根据不同的业务逻辑来实现xml数据的读取和写入,并提供接口方法给web表现层调用。

具体的调用代码:

list.asp

只显示相关代码。

<%

。。。。。。

Dim classid

classid = Request("classid")

If classid = "" Or (Not IsNumeric(classid)) Then Response.write "参数错误!":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)

'总页数

TotalPage = int(clng(TotalRec)/sPagesize*-1)*-1

If Clng(TotalRec)>0 Then

showData myarr

End If

................

%>

最后在页面最底部调用一个asp的script语句来更新xml缓存。

<script type="text/javascript" src="setcache.asp?action=list&curpage=<%=curpage%>&classid=<%=classid%>"></script>

setcache.asp

相关代码

<%

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 '创建分类的xml

End If

ElseIf action = "search" Then

keyword = Trim(Request("keyword"))

If keyword="" Then

Else

CreateSearchxml keyword,CLng(curpage),20,10,60 * 60 * 2 '创建搜索的xml

End If

ElseIf action = "detail" Then

thmid = Request("id")

If thmid="" Or (Not IsNumeric(thmid)) Then

Else

CreateDetailxml CLng(thmid),60 * 60 * 2 '创建详情的xml

End If

End If

Call Closeconn

Response.write " "

Response.End

%>

至此,核心代码都分享出来了,实践证明,通过这样的方式,我的138手机主题网的服务器的CPU占用率和内存占用率明显下降,访问速度也明显提高,从以前的需要几秒甚至10多秒,到现在只需要10几毫秒。

为了方便大家理解其中的代码,我特地做了一个demo,供同行学习交流。地址:http://www.shouji138.com/aspnet2/demo

此例程的完整下载包:http://www.shouji138.com/aspnet2/demo/xmlcachedemo.rar

本人QQ:441003232 欢迎大家交流共同进步。

也可以访问本人的小站:手机主题:http://www.shouji138.com

打造一个高性能稳定的web站点一直是站长和程序员的梦想,本文用作者的一次亲身经历的来说说如何利用xml缓存技术实现站点的高性能。我是从今年开始做138手机主题网的,采用SQL2000做为数据库,开发语言用的是Asp,查询的时候都是动态查询,直接用like %的方式,那个时候反正一天的访问量小,同时在线的时候也就几十个人而已,所以服务器也就能胜任要求,随着访问量慢慢增加,当同时在线达到几百人时,此时服务器开始不堪重负,CPU常常达到100%不降,网页打开速度也超级慢,一个查询页面需要几秒钟甚至更长,于是我开始考虑优化程序和数据库,数据库建立索引,不是很理想,因为用的是like '% 这种方式,于是我想到了缓存,而xml本身的特点决定了他非常适合做数据库的缓存,好东西不敢独享,特发布出来,以便同行交流,共同进步。 实现的思路是这样的:程序读取信息时,先判断是否缓存了xml数据,如果有,则直接从xml中读取信息,否则从数据库中读取,并将此次结果生成xml文件,以便以后调用,加快速度,同时判断xml缓存文件是否过期,如果过期则需要重新生成xml。下面是具体的代码。 xmlcachecls.asp <% Rem xml数据缓存类 '-------------------------------------------------- '转载的时候请保留版权信息 '作者:walkman '网址:手机主题 [url=http://www.shouji138.com/]http://www.shouji138.com[/url] '版本:ver1.0 '欢迎各位交流进步 '-------------------------------------------------- Class XmlCacheCls Rem 私有变量定义 Private m_CacheTime '缓存时间,单位秒 Private m_PageSize '每页大小 Private m_CachePageNum 'xml缓存页大小 Private m_XmlFile 'xml路径,用绝对地址,不需要加扩展名 Private m_Sql 'SQL语句 Private m_TableName '表名或者视图名 Private m_Columns '列名 用,隔开 Private m_CurPage '当前页 Private m_CacheType '缓存类型:1,列表 2,详情 Private m_DataConn '数据源,必须已经打开 Private m_QueryType '查询类型:1,直接用sql 2,用存储过程 Private m_SQLArr '返回的数据数组 Private m_RecordCount Rem 公共属性 '缓存时间 Public Property Let CacheTime(v) m_CacheTime = v End Property Public Property Get CacheTime CacheTime = m_CacheTime End Property '每页大小 Public Property Let PageSize(v) m_PageSize = v End Property Public Property Get PageSize PageSize = m_PageSize End Property 'xml缓存页大小 Public Property Let CachePageNum(v) m_CachePageNum = v End Property Public Property Get CachePageNum CachePageNum = m_CachePageNum End Property 'xml路径,用绝对地址 Public Property Let XmlFile(v) m_XmlFile = v End Property Public Property Get XmlFile XmlFile = m_XmlFile End Property 'xml路径,用绝对地址 'http://www.knowsky.com/article.asp?typeid=2 Public Property Let Sql(v) m_Sql = v End Property Public Property Get Sql Sql = m_Sql End Property '表名或者视图名 Public Property Let TableName(v) m_TableName = v End Property Public Property Get TableName TableName = m_TableName End Property '列名 用,隔开 Public Property Let Columns(v) m_Columns = v End Property Public Property Get Columns Columns = m_Columns End Property '当前页 Public Property Let CurPage(v) m_CurPage = v End Property Public Property Get CurPage CurPage = m_CurPage End Property '缓存类型:1,列表 2,详情 Public Property Let CacheType(v) m_CacheType = v End Property Public Property Get CacheType CacheType = m_CacheType End Property '缓存类型:1,列表 2,详情 Public Property Set Conn(v) Set m_DataConn = v End Property Public Property Get Conn Conn = m_DataConn End Property '返回记录总数 Public Property Get RecordCount RecordCount = m_RecordCount End Property '返回记录数组 'http://www.devdao.com/ Public Property Get SQLArr SQLArr = m_SQLArr End Property Rem 公共方法 读取数据 Public Function ReadData If m_CacheType = 1 Then ReadListAndSearchData Else ReadContentData End If End Function Rem 读取详情信息 Private Function ReadContentData Dim xmlfile xmlfile = m_XmlFile If FSOExistsFile(xmlfile) Then '存在xml缓存,直接从xml中读取 ReadContentDataFromXml xmlfile Else ReadContentDataFromDB End If End Function Rem 从xml文件读取详情信息 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 从Db中读取详情信息 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 读取列表数据 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缓存,直接从xml中读取 ReadListAndSearchDataFromXml xmlfile Else ReadListAndSearchDataFromDB End If End Function Rem 从xml中读列表数据 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 计算开始位置 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 从DB中读列表数据 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 获取xml文件名称 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 将数据写入xml文件 Public Function WriteDataToXml If m_CacheType = 1 Then WriteListAndSearchDataToXml Else WriteContentDataToXml End If End Function Rem 写具体某条信息的详情xml Private Function WriteContentDataToXml Rem xml未过期则直接退出 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数据 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未过期则直接退出 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时间 Private Function FSOGetFileLastModifiedTime(file) Dim fso,f,s Set fso=CreateObject("Scripting.FileSystemObject") Set f=fso.GetFile(file) FSOGetFileLastModifiedTime = f.DateLastModified Set f = Nothing Set fso = Nothing End Function Rem 判断xml缓存是否到期 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 生成详细数据的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&"") '创建文件夹 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&"") '创建文件夹 WriteStringToXMLFile xmlfile,xmlcontent End Function Rem xml转义字符 Private Function XMLStringEnCode(str) If str&"" = "" Then XMLStringEnCode="":Exit Function str = Replace(str,"<","&lt;") str = Replace(str,">","&gt;") str = Replace(str,"'","&apos;") str = Replace(str,"""","&quot;") str = Replace(str,"&","&amp;") XMLStringEnCode = str End Function Rem 写文件 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 创建文件夹 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 %> 此类包含两种缓存方式:一种是基于列表方式的,如按照某个类别显示信息、搜索某个关键词进行显示;另外一种是详细页面的缓存,如显示具体的某篇文章。 此类与具体的业务逻辑无关,只负责xml数据的读取和存储,判断是否缓存过期决定是否需要更新缓存。按照三层构架模式的话,它处于数据访问层。 调用这个类的代码: Business.asp <% Rem xml数据缓存类业务逻辑层代码 '-------------------------------------------------- '转载的时候请保留版权信息 '作者:walkman '网址:手机主题 [url=http://www.shouji138.com/]http://www.shouji138.com[/url] '版本:ver1.0 '欢迎各位交流进步 '-------------------------------------------------- Rem 根据classid取列表数据 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 '每页N条记录 cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量 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 根据classid生成xml缓存 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 '缓存时间 cache.PageSize = PageSize '每页N条记录 cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量 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 根据keyword取列表数据 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 '每页N条记录 cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量 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 根据keyword生成xml缓存 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 '缓存时间 cache.PageSize = PageSize '每页N条记录 cache.CachePageNum = CachePageNum '一个xml文件缓存M页的数据量 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 根据classid取列表数据 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 根据keyword生成xml缓存 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 '缓存时间 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 检测动态数组是否已分配 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="[url=http://www.shouji138.com]http://www.shouji138.com<%=SQLArr(2,m)%[/url]>" width="107" border="0"></a> </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 %> 这个文件是业务逻辑层代码,负责根据不同的业务逻辑来实现xml数据的读取和写入,并提供接口方法给web表现层调用。 具体的调用代码: list.asp 只显示相关代码。 <% 。。。。。。 Dim classid classid = Request("classid") If classid = "" Or (Not IsNumeric(classid)) Then Response.write "参数错误!":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) '总页数 TotalPage = int(clng(TotalRec)/sPagesize*-1)*-1 If Clng(TotalRec)>0 Then showData myarr End If ................ %> 最后在页面最底部调用一个asp的script语句来更新xml缓存。 <script type="text/javascript" src="setcache.asp?action=list&curpage=<%=curpage%>&classid=<%=classid%>"></script> setcache.asp 相关代码 <% 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 '创建分类的xml End If ElseIf action = "search" Then keyword = Trim(Request("keyword")) If keyword="" Then Else CreateSearchxml keyword,CLng(curpage),20,10,60 * 60 * 2 '创建搜索的xml End If ElseIf action = "detail" Then thmid = Request("id") If thmid="" Or (Not IsNumeric(thmid)) Then Else CreateDetailxml CLng(thmid),60 * 60 * 2 '创建详情的xml End If End If Call Closeconn Response.write " " Response.End %> 至此,核心代码都分享出来了,实践证明,通过这样的方式,我的138手机主题网的服务器的CPU占用率和内存占用率明显下降,访问速度也明显提高,从以前的需要几秒甚至10多秒,到现在只需要10几毫秒。 为了方便大家理解其中的代码,我特地做了一个demo,供同行学习交流。地址:[url=http://www.shouji138.com/aspnet2/demo]http://www.shouji138.com/aspnet2/demo[/url] 此例程的完整下载包:[url=http://www.shouji138.com/aspnet2/demo/xmlcachedemo.rar]http://www.shouji138.com/aspnet2/demo/xmlcachedemo.rar[/url] 本人QQ:441003232 欢迎大家交流共同进步。 也可以访问本人的小站:手机主题:http://www.shouji138.com
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