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: B&0;4
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CountBean.java #7G*GbKY
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/* =9wy/c$
* CountData.java WsGths+[
* l\OLyQ
* Created on 2007年1月1日, 下午4:44 Dw6 fmyJ:
* F3Maqr y
* To change this template, choose Tools | Options and locate the template under "i^
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* the Source Creation and Management node. Right-click the template and choose 6.WceWBR
* Open. You can then make changes to the template in the Source Editor. >''U
*/ A8r^)QJP{
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package com.tot.count; K > g[k_
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/** GVGlVAo|@
* V3Z]DA
* @author x;s0j"`Jb
*/ lLhL`C!
public class CountBean { pzZk\-0R
private String countType; #xh_
int countId; YJV% a
/** Creates a new instance of CountData */ .a'f|c6
public CountBean() {} 4rg2y]
public void setCountType(String countTypes){ Xf[kI
this.countType=countTypes; yx38g
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}
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public void setCountId(int countIds){ WKfkKk;G
this.countId=countIds; OHv!
} <ABX0U[*
public String getCountType(){ Ifc]K?
return countType; +0Q,vK#j^
} 942lSyix
public int getCountId(){ ]}|byo
return countId; e'%v1-&sP
} "qz3u`[o
} rwLAW"0Qz
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CountCache.java 8.AR.o
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/* D\dWt1n
* CountCache.java /AY4M;}p
* {^a36i
* Created on 2007年1月1日, 下午5:01 D,v U
* \JEXX4%
* To change this template, choose Tools | Options and locate the template under 4`m~FNVS
* the Source Creation and Management node. Right-click the template and choose G2bDf-1ew
* Open. You can then make changes to the template in the Source Editor. Mn1Pt|_@!
*/ #G" xNl
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package com.tot.count; PXzsj.
import java.util.*; *a;@*
/** U1_@F$mq<
* P262Q&.}d
* @author }o4N<%/+
*/ ?'86d_8
public class CountCache { 3<?
public static LinkedList list=new LinkedList(); S{pXs&4O
/** Creates a new instance of CountCache */ y;wx?1)
public CountCache() {} ULrr=5&8
public static void add(CountBean cb){ !* Ti}oIo&
if(cb!=null){ Q1d'~e
list.add(cb); jp8@vdRg
} . o7m!
} `nM/l@
} I-y#Ks1p+
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CountControl.java %,Sf1fUJ
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/* [FA{x?vkf
* CountThread.java *4+3ObA
* x3jb%`o#!
* Created on 2007年1月1日, 下午4:57 %VYAd)gC
* [[PEa-992
* To change this template, choose Tools | Options and locate the template under j`^$#
* the Source Creation and Management node. Right-click the template and choose $vC1 K5sLk
* Open. You can then make changes to the template in the Source Editor. ;<yd^Xs
*/ 'o|30LzYgQ
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package com.tot.count; .+7;)K
import tot.db.DBUtils; NI#X@
import java.sql.*; mMsTyM-f
/** t@u7RL*n:<
* w(kf
* @author t!*+8Q!e
*/ 1)
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public class CountControl{ O5$/55PI
private static long lastExecuteTime=0;//上次更新时间 &j(+ /;A
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Y<1QY?1sd
/** Creates a new instance of CountThread */
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public CountControl() {} JJ;[,
public synchronized void executeUpdate(){ R\o<7g-|
Connection conn=null; d>;&9;)H
PreparedStatement ps=null; 2gO2jJlv
try{ MZ Aij
conn = DBUtils.getConnection(); l @^3Exwt
conn.setAutoCommit(false); )*4fzo
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); "Rn3lj0
for(int i=0;i<CountCache.list.size();i++){ ,0x y\u
CountBean cb=(CountBean)CountCache.list.getFirst(); JkW9D)6
CountCache.list.removeFirst(); DXz}YIEC
ps.setInt(1, cb.getCountId()); >:D
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ps.executeUpdate();⑴ GpZc5c
//ps.addBatch();⑵ !Mi;*ZR
} f|O{#AC
//int [] counts = ps.executeBatch();⑶ Y3Vlp/"rB"
conn.commit(); i4^o59}8
}catch(Exception e){ #fT*]NN
e.printStackTrace(); XsnF~)YW
} finally{ ylt`*|$
try{ 0-~\
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if(ps!=null) { X]\ \,
ps.clearParameters(); 9U$EJN_G
ps.close(); T&Lb<'f
ps=null; ^i:`ZfA#
} (aD_zG=k5
}catch(SQLException e){} !\&