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: i&JpM]N
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CountBean.java L${m/@9
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/* OZ=Cp$
* CountData.java f_rp<R>Uu
* Wj&nUp{
* Created on 2007年1月1日, 下午4:44 $|k%@Q>
* l_6e I
* To change this template, choose Tools | Options and locate the template under z?)He)d
* the Source Creation and Management node. Right-click the template and choose /N>} 4Ay
* Open. You can then make changes to the template in the Source Editor. {#N%Bq}
*/ E30Ln_^o
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package com.tot.count; NddO*`8+)
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/** sZKEUSFD #
* RB[/q:
* @author [_V:)
*/ ul$,q05nb
public class CountBean { 6(Vhtr2(*
private String countType; J smB^
int countId; ;`+`#h3-V
/** Creates a new instance of CountData */ H;QA@tF>5
public CountBean() {} Pubv$u2
public void setCountType(String countTypes){ q(gjT^aN
this.countType=countTypes; j1A|D
} !.*iw
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public void setCountId(int countIds){ L!,d"wuD
this.countId=countIds; 2L:$aZ
} W2hA-1
public String getCountType(){ )&:L'N
return countType; Jld\8=
} BKay*!'PX
public int getCountId(){ h/HHKn
return countId; >k;p.Pay%
} \%TyrY+`K
} \^0 !|
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CountCache.java OM)3Y6rK
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/* zW5C1:.3K
* CountCache.java *GJ:+U&m[
* b!^@PIX
* Created on 2007年1月1日, 下午5:01 |NJ}F@t/5
* vQgq]mA?
* To change this template, choose Tools | Options and locate the template under BZ+;n
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* the Source Creation and Management node. Right-click the template and choose 6WeM rWx
* Open. You can then make changes to the template in the Source Editor. !p',Za
*/ 7\X$7
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package com.tot.count; Bd&`Xfebj
import java.util.*; VO_dA4C}z
/** FqZgdmwR
* M?$ZJ-
* @author oxzq!U
*/ /P:EWUf'
public class CountCache { 2)9r'ai?a
public static LinkedList list=new LinkedList(); oQ\&}@(V
/** Creates a new instance of CountCache */ G>K@AW#
public CountCache() {} 0e16Ow6\!1
public static void add(CountBean cb){ 8vSIf+
if(cb!=null){ hF>u)%J/S
list.add(cb); Juu+vMn1
} R%"K
} id?E)Jy
} I3(d<+M
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CountControl.java to`mnp9Z
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/* Hhl-E:"H`
* CountThread.java /8c&Axuv
* MA*
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* Created on 2007年1月1日, 下午4:57 R/~,i;d>
* 0%#\w*X8
* To change this template, choose Tools | Options and locate the template under G\kpUdj}
* the Source Creation and Management node. Right-click the template and choose 4MLH+/e
* Open. You can then make changes to the template in the Source Editor. Oaa"T8t
*/ (%'9CfPx
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package com.tot.count; Ee)xnY%(
import tot.db.DBUtils; gCJIIzl%Bh
import java.sql.*; WbcS: !0
/** 4TZ cc|B5
* J#
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* @author :c=.D;,
*/ cbYK5fj"T
public class CountControl{ (s&&>M]r_
private static long lastExecuteTime=0;//上次更新时间 ?JXa~.dA
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 UQPU"F7.
/** Creates a new instance of CountThread */ 5jZiJw(
public CountControl() {} E ]f)Os$
public synchronized void executeUpdate(){ D(\$i.,b2
Connection conn=null; Bm /YgQi
PreparedStatement ps=null; r,;\/^ u*
try{ ^B]@Lr E^
conn = DBUtils.getConnection(); ;dZMa]X0
conn.setAutoCommit(false); JvL{| KtyU
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Cy@ cLdV
for(int i=0;i<CountCache.list.size();i++){ L'E^c,-x~
CountBean cb=(CountBean)CountCache.list.getFirst(); fYX<d%?7
CountCache.list.removeFirst(); &