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: mY[*Cj3WJ
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CountBean.java @' %XdH
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/* t,'J%)j
* CountData.java a8v\H8@X
* $at\aJ
* Created on 2007年1月1日, 下午4:44 .JTRFk{W
* {<a)+S.6U
* To change this template, choose Tools | Options and locate the template under LE~vSm^#
* the Source Creation and Management node. Right-click the template and choose .mg0L\
* Open. You can then make changes to the template in the Source Editor. 9G"4w` P
*/ Yakrsi/jV}
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package com.tot.count; .r&CIL>
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/** }eI9me@Aa
* #T8jHnI
* @author YMy**
*/ kGC*\?<LmR
public class CountBean { P #8+1iC1
private String countType; =v!Z8zk=W
int countId; c6=XJvz
/** Creates a new instance of CountData */ xls
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public CountBean() {} mey -Bn
public void setCountType(String countTypes){ N)a5~<fBG
this.countType=countTypes; !KT.p2\
} ~IPATG
public void setCountId(int countIds){ {5HQ=&
this.countId=countIds; m6H+4@Z-;(
} |}:q@]dC#
public String getCountType(){ `Fe/=]<$
return countType; 1{RA\CF
} @3 +
public int getCountId(){ f_;tFP
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return countId; R#?atL$(
} <Wj/A/
} cVarvueS
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CountCache.java sFvYCRw
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/* Lpnw(r9Y
* CountCache.java M0e&GR8<z>
* YguW2R=6]
* Created on 2007年1月1日, 下午5:01 |oX9SU l
* 0R0_UvsXU
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose KG96;l@'(
* Open. You can then make changes to the template in the Source Editor. QW_v\GHx
*/ &uV|Ie8@q
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package com.tot.count; v}z^M_eFm
import java.util.*; e5lJ)_o
/** _j{)%%?r
* :RYYjmG5;
* @author }N,v&B
*/ qC=ZH#
public class CountCache { zxd<Cq>d
public static LinkedList list=new LinkedList(); P.=Dd"La
/** Creates a new instance of CountCache */ LW/> %
public CountCache() {} mZ3Z8q}%P
public static void add(CountBean cb){ jd"YaZOQ
if(cb!=null){ ]D^; Ca
list.add(cb); O`PQ4Q*F
} I8IH\5k
} @ kba^z
} #k!;=\FV
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CountControl.java S3QX{5t\
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/*
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* CountThread.java *Ct
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* {t:*Xu
* Created on 2007年1月1日, 下午4:57 8)b*q\O'
* o_ixdnc
* To change this template, choose Tools | Options and locate the template under Z%SDN"+'g
* the Source Creation and Management node. Right-click the template and choose g`"_+x'
* Open. You can then make changes to the template in the Source Editor. Qi9M4Yv
*/ ws,VO*4
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package com.tot.count; / >7G
import tot.db.DBUtils; 2e({%P@2?
import java.sql.*; !Pd)
/** xP'"!d4^i
* 5<oV>|*@{
* @author =feVT2*
*/ j<w5xY
public class CountControl{ K#yCZ2
private static long lastExecuteTime=0;//上次更新时间 E1qf N>0Z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 >[P`$XkXd4
/** Creates a new instance of CountThread */ O tR
public CountControl() {} 4X>=UO``L
public synchronized void executeUpdate(){ N_VWA.JHt
Connection conn=null; 5&134!hC
PreparedStatement ps=null; 9tCF m.m
try{ njb{
conn = DBUtils.getConnection(); #[~f 6s9D
conn.setAutoCommit(false); <VT|R~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ^F|/\i
for(int i=0;i<CountCache.list.size();i++){ a7laCHI
CountBean cb=(CountBean)CountCache.list.getFirst(); A$::|2~
CountCache.list.removeFirst(); OX{2@+f#
ps.setInt(1, cb.getCountId()); (<Kf
ps.executeUpdate();⑴ 1X#gHstD
//ps.addBatch();⑵ 3lefB
A7
} U%tpNWB
//int [] counts = ps.executeBatch();⑶ Tpp?(lT7r
conn.commit(); 9aY}+hgb#
}catch(Exception e){ nh/%0=S
e.printStackTrace(); \U HI%1^
} finally{ 0NyM|
try{ }h9f(ZyJn
if(ps!=null) { <+p{U(
ps.clearParameters(); JP6+h>ft
ps.close(); 0JV|wd8j
ps=null; '2S?4Z
} E~c>LF_]Q
}catch(SQLException e){} lXu6=r
DBUtils.closeConnection(conn); dZ,~yV
} Uk0
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} U^9#uK6GM
public long getLast(){ PKX
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return lastExecuteTime; `:fh$V5J>
} $ I|K<slV
public void run(){ $6*6%T5}
long now = System.currentTimeMillis(); )'axJ
if ((now - lastExecuteTime) > executeSep) { 7\EY&KI"0
//System.out.print("lastExecuteTime:"+lastExecuteTime); ^:^8M4:
//System.out.print(" now:"+now+"\n"); aQL$?,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pLsWy&G
lastExecuteTime=now; _K<Z
executeUpdate(); ]Jx_bs~g
} /fC8jdp&
else{ KDJ-IXoU
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); [D<"qT^*z6
} _|s'0F/t
} 9wpV} .(
} ~zL DLr=
//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
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类写好了,下面是在JSP中如下调用。 Yjh02wo
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<% ^y<8&ZFH
CountBean cb=new CountBean(); iJ!p9E*(
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); E}8wnrxf
CountCache.add(cb); n>?eTlO3
out.print(CountCache.list.size()+"<br>"); dNT<![X\
CountControl c=new CountControl(); T6I$7F
c.run(); 4ZrRgx2MD
out.print(CountCache.list.size()+"<br>"); Q;0g
%>