有时要为每一篇文章统计其点击次数,如果每一次浏览都要更新一次库的话,那性能在访问量很大的情况下,服务器的压力就会很大了,比较好一点的方法就是先将要更新的数据缓存起来,然后每隔一段时间再利用数据库的批量处理,批量更新库。源码如下: ^7^N}x@
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CountBean.java 1yQejw
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/* a5YIUVCv
* CountData.java ? *>]")[>
* v{aq`uH
* Created on 2007年1月1日, 下午4:44 :Dt~e|
* -
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* To change this template, choose Tools | Options and locate the template under up>c$jJ
* the Source Creation and Management node. Right-click the template and choose |~!U4D\
* Open. You can then make changes to the template in the Source Editor. t] aea*B
*/ -=`#fDvBn
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package com.tot.count; "ZwKk
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/** S35~Cp
* 6eFp8bANN#
* @author 7aV%=_
*/ <-'$~G j
public class CountBean { >J9oH=S6
private String countType; }%7NF*
int countId; #T w@wfaq)
/** Creates a new instance of CountData */ c;?fMX
public CountBean() {} ZJPmR/OV_
public void setCountType(String countTypes){ HpZ1xT
this.countType=countTypes; ziPR>iz-
} ",6M)3{|c
public void setCountId(int countIds){ #>lG7Ns|4
this.countId=countIds; br-]fE.be
} AN!s{7V3
public String getCountType(){ :cB=SYcC%
return countType; oVFnlA
} Xpe)PXb
public int getCountId(){ %D$]VSP;
return countId; [AMAa]^
} I$q]. B
} I/Jb!R ~
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CountCache.java BTgG4F/)
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/* @,Gxk
* CountCache.java g0R~&AN!g
* ktIi$v
* Created on 2007年1月1日, 下午5:01 *g?Po+ef%
* 7X@mSXis
* To change this template, choose Tools | Options and locate the template under ~t9tnLc$
* the Source Creation and Management node. Right-click the template and choose n3AaZp[
* Open. You can then make changes to the template in the Source Editor. (aOv#Vor]%
*/ <sK4#!K
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package com.tot.count; 4=<tWa|@9
import java.util.*; }PTV] q%
/** `x%'jPP1^
* WSuww
* @author fhL,aCS=
*/
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public class CountCache { R2Zgx\VV'
public static LinkedList list=new LinkedList(); &f-Uyr7?
/** Creates a new instance of CountCache */ S<'[%ihx
public CountCache() {} F~h7{@\
public static void add(CountBean cb){ /|*
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if(cb!=null){ .L'.c/ s
list.add(cb); yw];P
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} AGLscf.
} [w%
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} M#(+c_(r
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CountControl.java 8Z(Mvq]f&
*98$dQR$
/* 6I@h9uIsze
* CountThread.java n{6G"t:^l
* g+J-Zg6
* Created on 2007年1月1日, 下午4:57 0u\GO;
* ?@E!u|]K
* To change this template, choose Tools | Options and locate the template under E?_Z`*h
* the Source Creation and Management node. Right-click the template and choose X5j1`t,
* Open. You can then make changes to the template in the Source Editor. Djg,Lvhm
*/ Na:w]r:y
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package com.tot.count; "'D=,*
import tot.db.DBUtils; Q%xC}||1s"
import java.sql.*; C=eF.FB;'
/** yu;P +G
* xg3:} LQ
* @author \B,(k<
*/ Oil?JI Hq
public class CountControl{ euC&0Ee2
private static long lastExecuteTime=0;//上次更新时间 hEp(A8g)bQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 uD^cxD
/** Creates a new instance of CountThread */ yU9DSY\m{
public CountControl() {} Z<vKQ4G
public synchronized void executeUpdate(){ ouuuc9x]
Connection conn=null; *s:(jDlv
PreparedStatement ps=null; 8P|D13- Q
try{ DAXX;4
conn = DBUtils.getConnection(); e
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conn.setAutoCommit(false); =>_\fNy
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 'IwNTM
for(int i=0;i<CountCache.list.size();i++){ u
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CountBean cb=(CountBean)CountCache.list.getFirst(); 9Gnc9_]I;W
CountCache.list.removeFirst(); #`)(e JF
ps.setInt(1, cb.getCountId()); b:TLV`>/&
ps.executeUpdate();⑴ !qWH`[:
//ps.addBatch();⑵ E"5*Ei)^3
} MRdduPrM%$
//int [] counts = ps.executeBatch();⑶ d~i+
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conn.commit(); NfjE`
}catch(Exception e){
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e.printStackTrace(); >Z'NXha
} finally{ / G7vwC
try{ B!?%O
if(ps!=null) { d>mo~
ps.clearParameters(); * -8&[D0
ps.close(); tP$<UKtU
ps=null; R}!:'^
} d'NIV9P`j]
}catch(SQLException e){} UWd=!h^dt
DBUtils.closeConnection(conn); ui/a|Q
} Jcrw#l8|C
} bcE._9@@
public long getLast(){ PamO8^!G
return lastExecuteTime; 67Th;h*sh
} OWg(#pZk
public void run(){ u)+8S/ )
long now = System.currentTimeMillis(); E?
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if ((now - lastExecuteTime) > executeSep) { T7hcnF$
//System.out.print("lastExecuteTime:"+lastExecuteTime); |R/%D%_g
//System.out.print(" now:"+now+"\n"); A;]}m8(*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 1=d6NX)B
lastExecuteTime=now; |l]XpWV
executeUpdate(); [q8 P~l
} ) QU
else{ !
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); @emK1iwm
} Ezd_`_@R
} J;8IY=
} wNpTM8rfU#
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 Y,^@P
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类写好了,下面是在JSP中如下调用。 !xo{-@@wS
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<% d,B:kE0Y
CountBean cb=new CountBean(); ] Zy5%gI
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); s;01u_
CountCache.add(cb); {#?N
out.print(CountCache.list.size()+"<br>"); Ac2n
CountControl c=new CountControl(); {Tq_7,8
c.run(); LnH ?dy
out.print(CountCache.list.size()+"<br>"); CYY=R'1:G{
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