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: orGMzC 2
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CountBean.java
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/* w!F>fcm
* CountData.java s<I)THC
* AO-5>r
* Created on 2007年1月1日, 下午4:44 4MgN
* 5vx 4F f
* To change this template, choose Tools | Options and locate the template under msl.{
* the Source Creation and Management node. Right-click the template and choose LV:L0D7y
* Open. You can then make changes to the template in the Source Editor. R(1:I@<?E
*/ hA7=:LG
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package com.tot.count; 5YY5t^T
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/** Y2`sL,'h
* I dK*IA4
* @author \Zj%eW!m
*/ H*=cw<
public class CountBean { jPWONz(#
private String countType; &*`dRIQ]
int countId; GwX)~.i
/** Creates a new instance of CountData */ pN9 !
public CountBean() {} z?byNd8
public void setCountType(String countTypes){ irt9%w4"
this.countType=countTypes; L!}!k N:?
} <ToS&
public void setCountId(int countIds){ B/agW
this.countId=countIds; cY?|RXNmZ
} p6DI7<C<H
public String getCountType(){ };Q}C0E
return countType; @%4'2b
} cYSn
public int getCountId(){ 7:4c\C0
return countId; m$vq%[/#
} x-%O1frc
} G5}_NS/
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CountCache.java )D8op;Fn
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/* 8eXeb|?J
* CountCache.java 0D5Z#iW>1
* q5f QTV
* Created on 2007年1月1日, 下午5:01 ]#o;`5'
* R"cQyG4
* To change this template, choose Tools | Options and locate the template under iOiFkka
* the Source Creation and Management node. Right-click the template and choose 6n9/`D!
* Open. You can then make changes to the template in the Source Editor. 4|x_C-@
*/ t&?jJ7 (&8
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package com.tot.count; -.D?Z8e
import java.util.*; v=k+MvX
/** i}m'#b
* " MnWd BS
* @author }&0LoW/
*/ Ed=/w6<
public class CountCache { +hRy{Ps/
public static LinkedList list=new LinkedList();
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/** Creates a new instance of CountCache */ 8m+~HSIR
public CountCache() {}
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public static void add(CountBean cb){ k4{!h?h
if(cb!=null){ e{x>u(
list.add(cb); b|i4me@
} =xk>yw!O)
} FGVw=G{r
} G&oD;NY@/
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CountControl.java b7.7@Ly
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/* B^2r4
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* CountThread.java 5{=+S]
* -Q? i16pM
* Created on 2007年1月1日, 下午4:57 [n"eD4 )K|
* Xt$qjtVM
* To change this template, choose Tools | Options and locate the template under @X/ 1`Mp
* the Source Creation and Management node. Right-click the template and choose }3lG'Y#Kpy
* Open. You can then make changes to the template in the Source Editor. 3@~a)E}T
*/ ilL%
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package com.tot.count; ^Gk)aX
import tot.db.DBUtils; F_079~bJ
import java.sql.*; =z. hJu
/** 0>Y3xNb
* |k}<Zz1UM
* @author 8g-u
*/ 4)iP%%JH
public class CountControl{ %pVsafV
private static long lastExecuteTime=0;//上次更新时间 "}()/
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 []>rYZ9bv
/** Creates a new instance of CountThread */ c/$].VG0
public CountControl() {} jf)cDj2
public synchronized void executeUpdate(){ "M/c0`>C!i
Connection conn=null; ';R]`vWFe
PreparedStatement ps=null; QGN+f)
try{ =-^A;AO(
conn = DBUtils.getConnection(); x-i,v"8
conn.setAutoCommit(false); S(.J
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); nmpc<&<<
for(int i=0;i<CountCache.list.size();i++){ 7rD 8
CountBean cb=(CountBean)CountCache.list.getFirst(); #M!u';bZ
CountCache.list.removeFirst(); %oiF} >
ps.setInt(1, cb.getCountId()); gdIk%m4
ps.executeUpdate();⑴ /Xi21W/
//ps.addBatch();⑵ 0(i3RPIj\
} _i>_S n1"
//int [] counts = ps.executeBatch();⑶ `,4yGgD!4
conn.commit(); )M;~j
}catch(Exception e){ j&