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: 0v,DQJ?w8
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CountBean.java rM2?"
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/* +wY3E*hU
* CountData.java )Mi#{5z
* T=ox;r
* Created on 2007年1月1日, 下午4:44 +7|Oy3s
* BO#fzq%
* To change this template, choose Tools | Options and locate the template under fp:j~a>E
* the Source Creation and Management node. Right-click the template and choose '_4u,
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* Open. You can then make changes to the template in the Source Editor. !,V8?3.aJn
*/ `i9WnPRt
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package com.tot.count; s^AQJ{X
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/** st:[|`
* !Z<GUblt
* @author S2*-UluG
*/ H*A)U'`
public class CountBean { 49
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private String countType; 6K[s),rdv
int countId; Yc"G="XP;
/** Creates a new instance of CountData */ _ _-rP
public CountBean() {} R0gjx"U
public void setCountType(String countTypes){ F'C]OMBE
this.countType=countTypes; +G7A.d`V}
} j &)|nK;}
public void setCountId(int countIds){ mucY+k1>g
this.countId=countIds; ]W5s!T_
} Y GO ;wIS
public String getCountType(){ YzhZ%:8
return countType; 0Dc$nL?TqX
} )qzJu*cQ
public int getCountId(){ )d>"K`3
return countId; >Djv8 0
} sq@Eu>Ng(X
} c42p>}P[
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CountCache.java -+'{C=
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/* kFw3'OZ,
* CountCache.java ''?.6r
* IE|x+RBD
* Created on 2007年1月1日, 下午5:01 pn{.oXomf
* =uKK{\+|Y
* To change this template, choose Tools | Options and locate the template under j8hb
* the Source Creation and Management node. Right-click the template and choose E$F)z
* Open. You can then make changes to the template in the Source Editor. S]K^wj[
*/ 85w
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package com.tot.count; ky#<\K1}'
import java.util.*; A}t.`FLP,j
/** pZlBpGQf
* RLw=y{%p
* @author ?9Fv0-g&n
*/ K)_0ej~C
public class CountCache { d,8V-Dk+p
public static LinkedList list=new LinkedList(); 3P^eD:)
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/** Creates a new instance of CountCache */ [|ky~sRr
public CountCache() {} '?_I-="Mr
public static void add(CountBean cb){ [9'5+RXw3
if(cb!=null){ ;Zw!
list.add(cb); :2 QA#
} 0b?9LFd
} &{Uaa
} *>$'aQ
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CountControl.java z* zLK[t+
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/* [9[tn-
* CountThread.java V=3NIw18
* ~AjbF(Ad
* Created on 2007年1月1日, 下午4:57 @2YO_rL[
* ;9,Ll%Lk<
* To change this template, choose Tools | Options and locate the template under ?9mWMf%t
* the Source Creation and Management node. Right-click the template and choose &y3_>!L
* Open. You can then make changes to the template in the Source Editor. |I)MsNF
*/ a9FlzR
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package com.tot.count; qe`W~a9x
import tot.db.DBUtils; cvn,&G-`
import java.sql.*; |n01T_Z)P
/** je_77G(F
* nUd(@@%m
* @author l*B;/
>nR
*/ 1?E\2t&K
public class CountControl{ goRoi\z $
private static long lastExecuteTime=0;//上次更新时间 r/:9j(yxr
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 :d)@|SR1
/** Creates a new instance of CountThread */ %+o]1R
public CountControl() {} ~qFi0<-M
public synchronized void executeUpdate(){ pC_2_,6$
Connection conn=null; $Snwx
PreparedStatement ps=null; GrVvOJr
try{ H# 2'\0u
conn = DBUtils.getConnection(); 6CY_8/:zL
conn.setAutoCommit(false); "N7C7`izc
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n;v8Vc'
for(int i=0;i<CountCache.list.size();i++){ -']#5p l
CountBean cb=(CountBean)CountCache.list.getFirst(); h8pc<t\6
CountCache.list.removeFirst(); V9B $_j4
ps.setInt(1, cb.getCountId()); `.L8<