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: ^X?3e1om
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CountBean.java Pu]Pp`SP
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/* _E[)_yH'-
* CountData.java h1N{;SWQ
* SxRa?5
* Created on 2007年1月1日, 下午4:44 >]8H@. \
* *+cW)klm
* To change this template, choose Tools | Options and locate the template under &14Er,K
* the Source Creation and Management node. Right-click the template and choose 7NfA)$
* Open. You can then make changes to the template in the Source Editor. *p%=u>?&
*/ 8DJoQl9
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package com.tot.count; t'Pn*
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/** n#5%{e>
* QK/~lN
* @author n|I5ylt
*/ [[0u|`T/
public class CountBean { ^5*9BwH`
private String countType; ||kUi=5
int countId; )KD*G;<O]L
/** Creates a new instance of CountData */ 39,7N2 uY
public CountBean() {} |`6*~ciUV
public void setCountType(String countTypes){ xrl!$xE
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this.countType=countTypes; HO
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} kEM|;&=_
public void setCountId(int countIds){ f+W %X
this.countId=countIds; =ET |h}I
} PzDekyl
public String getCountType(){ !@kwHJkv
return countType; wtnC^d$
} Bgj^n{9x
public int getCountId(){ UgZuEfEGve
return countId; N(^
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} ).1F0T
} P>i[X0UnL
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CountCache.java OB5`a,5dI
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/* a@V`EEZ
* CountCache.java W~FM^xR?p
* etWCMR
* Created on 2007年1月1日, 下午5:01 iqPMCOPZ
* 0_faJjTbP;
* To change this template, choose Tools | Options and locate the template under <mdHca
* the Source Creation and Management node. Right-click the template and choose :NPnwX8w
* Open. You can then make changes to the template in the Source Editor. Rz9IjL.Z
*/ ;/g Bjp]H
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package com.tot.count;
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import java.util.*; `8D}\w<eI
/** &;Jg2f%.
* 0'0GAh2
* @author a"&Gs/QKSC
*/ (7_}UT@w-
public class CountCache { iSg^np
public static LinkedList list=new LinkedList(); ^9*kZV<K
/** Creates a new instance of CountCache */ Pwg?a
public CountCache() {} 0B?t:XU ,
public static void add(CountBean cb){ '6zD`Q
if(cb!=null){ B)}.%G*
list.add(cb); `suEN@^
} U}2b{
} &;]KntxB
} -'mTSJ.}
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CountControl.java ruQ1Cph
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/* HJeZm
* CountThread.java Gm2q`ki
* w[X/|O
* Created on 2007年1月1日, 下午4:57 /f0*NNSat-
* ~dc~<hK
* To change this template, choose Tools | Options and locate the template under VuWBWb?0Q
* the Source Creation and Management node. Right-click the template and choose R+y 9JE
* Open. You can then make changes to the template in the Source Editor. )D"E]
*/ yO`HL'SMo
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package com.tot.count; C=>IJ'G
import tot.db.DBUtils; [uD G;We=
import java.sql.*; 5b5Hc Inu
/** R
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* 14
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* @author VHihC]ks,
*/ TtKV5
public class CountControl{ 3"HW{=
private static long lastExecuteTime=0;//上次更新时间 $\A=J
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 LaCVI
/** Creates a new instance of CountThread */ waI:w,
public CountControl() {} 'Wz`P#/
public synchronized void executeUpdate(){ 6=o'.03\f
Connection conn=null; zt|DHVy
PreparedStatement ps=null; g ONybz6]
try{ ;S.o`z1GI
conn = DBUtils.getConnection(); kzuI<DW
conn.setAutoCommit(false); .ZK^kcyA
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); s7>a
for(int i=0;i<CountCache.list.size();i++){ A4>j4\A[M
CountBean cb=(CountBean)CountCache.list.getFirst(); (764-iv(
CountCache.list.removeFirst(); P/XCaj3a[
ps.setInt(1, cb.getCountId()); 'V#$PZx
ps.executeUpdate();⑴ zo>@"uH4
//ps.addBatch();⑵ %ot4$eY
} j| Hyv{sM
//int [] counts = ps.executeBatch();⑶ $4ZjN N@
conn.commit(); e"O c
}catch(Exception e){ ]]^eIjg>a6
e.printStackTrace(); 6k-
} finally{ 'BOMFp7c
try{ bc}BQ|Q
if(ps!=null) { 2Mo oqJp
ps.clearParameters(); {usv*Cm
ps.close(); QRKr2:o{
ps=null; /c:78@
} 0hr4}FL8
}catch(SQLException e){} >Xv
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DBUtils.closeConnection(conn); JKy06I
} 0 F-db
} .:/[%q{k
public long getLast(){ J[ 7Sf^r
return lastExecuteTime; KqhE=2,
} E,p4R%:$@1
public void run(){ '74*-yd
long now = System.currentTimeMillis(); }u?DK,R
if ((now - lastExecuteTime) > executeSep) { RHv|ijYy
//System.out.print("lastExecuteTime:"+lastExecuteTime); RoYwZX~
//System.out.print(" now:"+now+"\n"); mP[Z lS~"
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); /JbO $A
lastExecuteTime=now; q)rxv7Iu\
executeUpdate(); ]7DS>%mY(
} jWNF3\
else{ KzWqHq
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); gO%oA} !i
} l:- <CbG
} |$+
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} o7sIpE9
//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 G{]tB w
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类写好了,下面是在JSP中如下调用。 sX[k}=HCK
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<% !}I+)@~\w
CountBean cb=new CountBean(); ={[9kR i
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]Mb:zs<r
CountCache.add(cb); !5*
out.print(CountCache.list.size()+"<br>"); V<ExR@|}.%
CountControl c=new CountControl(); ;%B:1Z
c.run(); y)uxj-G
out.print(CountCache.list.size()+"<br>"); hA:RVeS{
%>