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: o~U$GBg
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CountBean.java F<ZYh
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/* zbXI%
* CountData.java uX"H4lO~
* bh s5x
* Created on 2007年1月1日, 下午4:44 :I"2V
* *!4Z#Y
* To change this template, choose Tools | Options and locate the template under rK@8/?y5
* the Source Creation and Management node. Right-click the template and choose vV'EZ?
* Open. You can then make changes to the template in the Source Editor. ob+b<HFv
*/ aB*Bz]5;E
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package com.tot.count; +cD<:"L'g
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/** rR$h*
* }^4Xv^dW>g
* @author @y e4q.m
*/ __lM7LFL
public class CountBean { ,oORW/0iS
private String countType; H ;7(}:.
int countId; @D)al^]x6
/** Creates a new instance of CountData */ =4vy@7/
public CountBean() {} 8&;UO{
public void setCountType(String countTypes){ b
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this.countType=countTypes; @:;)~V
} _U$<xVnP
public void setCountId(int countIds){ efSM`!%j
this.countId=countIds; wJg1Y0nh
} W$QcDp]#p}
public String getCountType(){ [NQOrcAQ
return countType; +ylTGSZS
} PUz*!9HC
public int getCountId(){ ZufR{^W
return countId; yID164&r
} 1 da@3xaF
} 3ovWwZ8&
];} Wfl
CountCache.java `^91%f
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/* g-qP;vy@"q
* CountCache.java &d9{k5/+\
* w _u\p a
* Created on 2007年1月1日, 下午5:01 rJd,Rdt.
* [M?}uK ^
* To change this template, choose Tools | Options and locate the template under zqd@EF6/bz
* the Source Creation and Management node. Right-click the template and choose LU+3{O5y
* Open. You can then make changes to the template in the Source Editor. sI43@[
*/ OBgkpx*Q
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package com.tot.count; Y4%:7mw~=
import java.util.*; H12Fw'2
/** h-g+g#*
* ke{8 ^X~#
* @author fTzvmC:g7
*/ h,QKd>4:CF
public class CountCache { 9*$t!r{B@
public static LinkedList list=new LinkedList(); +U:$(UV'A
/** Creates a new instance of CountCache */ z^KJ*E
public CountCache() {} $JS L-NkE
public static void add(CountBean cb){ qsL)}sC^8
if(cb!=null){ FK6[>(QO
list.add(cb); PEN\-*Pv
} D>|H 2
} E"\/M
} ~Xr=4V:a+
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CountControl.java :WC2Ax7$2
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/* &6DMk-
* CountThread.java 1h(0IjG8
* ?xK8#
* Created on 2007年1月1日, 下午4:57 ?m![Pg%
* PxF<\pu&
* To change this template, choose Tools | Options and locate the template under U!T~!C^
* the Source Creation and Management node. Right-click the template and choose "X2 Vrn'
* Open. You can then make changes to the template in the Source Editor. -\+s#kE:
*/ ~L]|?d"
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package com.tot.count; ()`7L|(`;q
import tot.db.DBUtils; 7}1~%:6
import java.sql.*; ;sfb 4x4
/** Ok{*fa.PK
* $J4 *U
* @author IOTR/anu
*/ I6~pV@h^=
public class CountControl{ 2<li7c59
private static long lastExecuteTime=0;//上次更新时间 @HT% n
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 aF8fqu\
/** Creates a new instance of CountThread */ jNu9KlN
public CountControl() {} Yv
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public synchronized void executeUpdate(){ "b?v?V0%C
Connection conn=null; e }mD]O}
PreparedStatement ps=null; K )[]fm
try{ "ZHW2l Mf
conn = DBUtils.getConnection(); |}23>l7
conn.setAutoCommit(false); `(T,+T4C5k
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); v. %R}Pa
for(int i=0;i<CountCache.list.size();i++){ Xf0M:\w=M
CountBean cb=(CountBean)CountCache.list.getFirst(); jQk*8
CountCache.list.removeFirst(); pqUCqo!m\
ps.setInt(1, cb.getCountId()); `J]fcE%T0R
ps.executeUpdate();⑴ 5>VY LI
//ps.addBatch();⑵ dG@"!!,
} `{,Dy!rL
//int [] counts = ps.executeBatch();⑶ @|LBn6q
conn.commit(); *Kyw^DI
}catch(Exception e){ f5F@^QXQ
e.printStackTrace(); F1 iGMf-8
} finally{ L{:9Cx!F
try{ 0ph{
if(ps!=null) { *ohL&