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: t/wo
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CountBean.java E0*KKo%
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/* w;{=
* CountData.java S4_C8
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* Created on 2007年1月1日, 下午4:44 $} @gR]
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* :R{pV7<O
* To change this template, choose Tools | Options and locate the template under kR+7JUq]
* the Source Creation and Management node. Right-click the template and choose 68?>#o865
* Open. You can then make changes to the template in the Source Editor. +SB>>
*/ :R-_EY$k6
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package com.tot.count; {>3J 96
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/** EY`]""~8v
* $ {h1(ec8
* @author M
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*/ S}b^_+UbP
public class CountBean { {E;oirv&
private String countType; kaT
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int countId; uq2C|=M-x\
/** Creates a new instance of CountData */ kz*6%Cg*~
public CountBean() {} P;G]qV%
public void setCountType(String countTypes){ :O'QL,
this.countType=countTypes; U2Tw_
} ^OOoo2
public void setCountId(int countIds){ 3&!v"ms
this.countId=countIds; Eq?U$eE
} I/*^s
public String getCountType(){ SHYbQF2
return countType; LVNA`|>
} nWes,K6T
public int getCountId(){ x[y}{T
return countId; #De a$
} fm^J-
} B'e@RhU;
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CountCache.java %Z3B9
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/* *3KSOcQ
* CountCache.java ?Dl; DE1
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* Created on 2007年1月1日, 下午5:01 HUChg{[
* 2 :4o`o
* To change this template, choose Tools | Options and locate the template under PfsUe,*
* the Source Creation and Management node. Right-click the template and choose @6
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* Open. You can then make changes to the template in the Source Editor. :}R,a=N
*/ y=aWSb2y'
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package com.tot.count; FHSFH>
import java.util.*; t2iQ[`/?~
/** ~"\WV4}`v
* #~m8zG
* @author |)C
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*/ e"%uOuIYX
public class CountCache { oj[~H}>
public static LinkedList list=new LinkedList(); kLF~^/
/** Creates a new instance of CountCache */ lbX
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public CountCache() {} Lq62
public static void add(CountBean cb){ qg/FI#r
if(cb!=null){ Dkx}}E:<
list.add(cb); BCuoFw)
} "L;@qCfhO
} D59q/@
} UpPl-jeT
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CountControl.java O')=]6CQ*
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/* 5UJ ?1"J
* CountThread.java zBK"k]rz
* }Q*J!OH
* Created on 2007年1月1日, 下午4:57
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* tZv^uuEp3
* To change this template, choose Tools | Options and locate the template under $@vB<(sk
* the Source Creation and Management node. Right-click the template and choose 052Cf
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* Open. You can then make changes to the template in the Source Editor. ~
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*/ !RPE-S
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package com.tot.count; C=(Q0-+L|
import tot.db.DBUtils; 8f1M6GK?
import java.sql.*; $)nPj_h
/** +V(^"Z~
* vS"h`pL
* @author X- X`Z`o
*/ =1k%T {>
public class CountControl{ [y}h
private static long lastExecuteTime=0;//上次更新时间 j{'_sI{{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 JS/ChoU
/** Creates a new instance of CountThread */ KxD/{0F
public CountControl() {} EP"Z 58&$R
public synchronized void executeUpdate(){ op/_:#&'
Connection conn=null; ^eyVEN
PreparedStatement ps=null; )o~/yB7
try{ $f _C~O
conn = DBUtils.getConnection(); 9XYm8g'X
conn.setAutoCommit(false); ce#Iu#qT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); xAl8e
for(int i=0;i<CountCache.list.size();i++){ .zl[nx[9"D
CountBean cb=(CountBean)CountCache.list.getFirst(); F:d2;
CountCache.list.removeFirst(); zy%0;%
ps.setInt(1, cb.getCountId()); Tr s2M+r)
ps.executeUpdate();⑴ {* :^K\-
//ps.addBatch();⑵ SSCs96
} 0g6sGz=
//int [] counts = ps.executeBatch();⑶ OjAdY\
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conn.commit(); 2@lGY_O!m
}catch(Exception e){ !*L)v
e.printStackTrace(); $U.|
} finally{ w;{Q)_A
try{ _3D9>8tzE7
if(ps!=null) { !h4A7KBYG
ps.clearParameters(); ,Jh#$mil
ps.close(); 9l"=]7~%
ps=null; 7y3WV95Z\
} 3!\h'5{
}catch(SQLException e){} |OAM;@jH
DBUtils.closeConnection(conn); qjh k#\y
} Woj5
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} & !ds#-
public long getLast(){ iNfAn&
return lastExecuteTime; b9#(I~}
} kW2DKr-[
public void run(){ VBix8|
long now = System.currentTimeMillis(); I |c!:4
if ((now - lastExecuteTime) > executeSep) { Xp9I3nd|
//System.out.print("lastExecuteTime:"+lastExecuteTime); NA/`LaJ
//System.out.print(" now:"+now+"\n"); ^"D^D`$@
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {Q37a=;,
lastExecuteTime=now; NN2mOJ:-
executeUpdate(); W6}>iB
} q^<HG]
else{ j'U1lEZm2
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); K:jn^JN$
} i!}6FBZ
} Axns
} S<NK!89
//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 akt7rnt?i
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类写好了,下面是在JSP中如下调用。 m7y[Y
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<% :H3/+/x
CountBean cb=new CountBean(); i0$*):b
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); /hu>MZ(\
CountCache.add(cb); \QC{38}
out.print(CountCache.list.size()+"<br>"); g hmn3
CountControl c=new CountControl(); -e}(\
c.run(); ` 6*]c n#(
out.print(CountCache.list.size()+"<br>"); lH`TF_
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