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: ^=gN >xP
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CountBean.java !bn=b>+
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/* rWN%j)#+
* CountData.java J)H*tzg
* PM)nw;nS
* Created on 2007年1月1日, 下午4:44 j:HIcCp
* Fc^!="H
* To change this template, choose Tools | Options and locate the template under wf^p?=Ke
* the Source Creation and Management node. Right-click the template and choose GgtYO4,
* Open. You can then make changes to the template in the Source Editor. -^< t%{d
*/ zXIdup@
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package com.tot.count; 7GJcg7s*T
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/** 7T(&DOGZ
* J(9{P/
* @author j.\0p-,
*/ fY|[YPGO^
public class CountBean { }LoMS<O-[
private String countType; CSBDSz
int countId; 1c*;Lr.K
/** Creates a new instance of CountData */ Ggbz
public CountBean() {} [<wpH0lNoy
public void setCountType(String countTypes){ 4K|O?MUNS
this.countType=countTypes; oE,TA2
} HNLr}
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public void setCountId(int countIds){ &_\;p-1:
this.countId=countIds; CF: !
} -U|Z9sia
public String getCountType(){ PlwM3lrj
return countType; 7zowvE?#
} u>*qDr*d
public int getCountId(){ ~G.MaSm
return countId; I]WvcDJ}C
} G[{Av5g mx
} lWUQkS
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CountCache.java jI9#OEH_g
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/* Xi w
* CountCache.java & u6ydN1xe
* 7W>(T8K X\
* Created on 2007年1月1日, 下午5:01 #oN}DP
* {YwdhwJP
* To change this template, choose Tools | Options and locate the template under _`,ZI{.J^
* the Source Creation and Management node. Right-click the template and choose :`uu[^
* Open. You can then make changes to the template in the Source Editor. 0:c3aq&u
*/ gu&W:FY
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package com.tot.count; [p]UM;+
import java.util.*; '-3K`[
/** ~(:0&w%e
* :m>Vp
* @author #c~-8=
*/ {Q@?CT
public class CountCache { p[)yn%uh
public static LinkedList list=new LinkedList(); q#\B}'I{
/** Creates a new instance of CountCache */ J|VDZ# c7
public CountCache() {} N0N%~3
public static void add(CountBean cb){ '}-QZ$|*
if(cb!=null){ ,bP8"|e
list.add(cb); +RnWeBXAT
} A=70UL
} fUZCP*7>
} {aUv>T"c
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CountControl.java ;Zn&Nc7
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/* p\Iy)Y2Lf!
* CountThread.java D%6}x^`Qk
* c5pK%I }O
* Created on 2007年1月1日, 下午4:57 ezri9\Ju
* Dj 6^|R$z&
* To change this template, choose Tools | Options and locate the template under =5uhIU0O
* the Source Creation and Management node. Right-click the template and choose KIKIag#
* Open. You can then make changes to the template in the Source Editor. %/ :&L+q
*/ a)7&2J
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package com.tot.count; w{]B)>! 1W
import tot.db.DBUtils; 2 #cw_Ua
import java.sql.*; ;";>7k/}
/** vG=Pi'4XXo
* -iFFXESVX
* @author "#iO{uMWb
*/ 17w{hK4o8O
public class CountControl{ h]IoH0/
private static long lastExecuteTime=0;//上次更新时间 9Vt6);cA-]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 iTF%}(
/** Creates a new instance of CountThread */ 8:uh0
public CountControl() {} J%fJF//U
public synchronized void executeUpdate(){ G=C2l#
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Connection conn=null; 4#I=n~8a
PreparedStatement ps=null; B%o%%A8*g
try{ ?DnQU"_$
conn = DBUtils.getConnection(); A>(EM}\,
conn.setAutoCommit(false); `wSoa#U"@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /gn\7&