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: PK).)5sW
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CountBean.java sXaudT
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/* ORx6r=zg
* CountData.java qd<-{
* Lvd es.0|
* Created on 2007年1月1日, 下午4:44 v2l*n
* cw3j&k
* To change this template, choose Tools | Options and locate the template under N@#,Y nPI
* the Source Creation and Management node. Right-click the template and choose Lm3~< vP1e
* Open. You can then make changes to the template in the Source Editor. 4&kC8
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*/ CC
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package com.tot.count; g^:
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/** 572{DC&T
* V|&->9"
* @author Ji)Ys
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*/ !9t,#?!
public class CountBean { WCD)yTg:ES
private String countType; dt|| nF
int countId; ZA+w7S3
/** Creates a new instance of CountData */ ^).
public CountBean() {} K1$
public void setCountType(String countTypes){ F}~qTF;H
this.countType=countTypes; Bwl@Muw
} 6UKZ0~R
public void setCountId(int countIds){ Jo''yrJpB
this.countId=countIds; Tx>V$+al
} {n\Ai3F-
public String getCountType(){ gY&WH9sp?9
return countType; s[bQO1g;*
} U8zCV*ag
public int getCountId(){ I%:\"g"c
return countId; +L|x^B3
} b/"gUYo
} cq0-Dd9^&
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CountCache.java %<0'xJ%%Q
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/* q ;"/i*+3
* CountCache.java 7epil
* v\o
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* Created on 2007年1月1日, 下午5:01 ezb*tN!
* Ao+6^z_
* To change this template, choose Tools | Options and locate the template under R} X"di
* the Source Creation and Management node. Right-click the template and choose k8c(|/7d
* Open. You can then make changes to the template in the Source Editor. jwpahy;\WL
*/ H<") )EJI
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package com.tot.count; GTM@9^
import java.util.*; " GY3sam
/** !bs5w_@
* `ZU]eAV
* @author &=]!8z=
*/ :nOI|\rC
public class CountCache { [,3E#+y
public static LinkedList list=new LinkedList(); q|V|Jl
/** Creates a new instance of CountCache */ iPdS>ee
public CountCache() {} lAR1gHhJ
public static void add(CountBean cb){ V :/v
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if(cb!=null){ I?RUVs
list.add(cb); I?
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} >n3ig~0d
} p:V1VHT,
} M`n0
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CountControl.java D#P]tt.Z
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/* vi.INe
* CountThread.java CG;+Z-"X
* g:Q:cSg<
* Created on 2007年1月1日, 下午4:57 {n&GZG"f
* Id1de>:;
* To change this template, choose Tools | Options and locate the template under U1 `pY:P
* the Source Creation and Management node. Right-click the template and choose MOPHu
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* Open. You can then make changes to the template in the Source Editor. ~)F_FS
*/ M@JW/~p'
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package com.tot.count; w
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import tot.db.DBUtils; [dFe-2u ,$
import java.sql.*; \l%##7DRp]
/** x2TE[#><
* |8tKN"QG
* @author Po&'#TC1
*/ # [
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public class CountControl{ pedyWA>
private static long lastExecuteTime=0;//上次更新时间 T"t.t%(8
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 qI>,PX
/** Creates a new instance of CountThread */ yuC|_nL
public CountControl() {} k!bG![Ie|
public synchronized void executeUpdate(){ Yxy!&hPLv:
Connection conn=null; 9oIfSr,y
PreparedStatement ps=null; m%'T90mi
try{ :|8!w
conn = DBUtils.getConnection(); Apj[z2nr
conn.setAutoCommit(false); !1%Sf.`!_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I5)$M{#a
for(int i=0;i<CountCache.list.size();i++){ B"
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CountBean cb=(CountBean)CountCache.list.getFirst(); <*+[E!oi
CountCache.list.removeFirst(); UoaWI2
ps.setInt(1, cb.getCountId()); -g:i'e
ps.executeUpdate();⑴ Vw3=jIQN:!
//ps.addBatch();⑵ .K1wp G[4
} K:A:3~I!NW
//int [] counts = ps.executeBatch();⑶ 9kwiG7V1
conn.commit(); Nv|0Z'M
}catch(Exception e){ (>,b5g
e.printStackTrace(); >6Jz=N,
} finally{ C\Z5%2<Z
try{
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if(ps!=null) { q6b&b^r+H
ps.clearParameters(); T9'HQu
ps.close(); #3tC"2MZ
ps=null; 0dQ\Y]b
} )?I*zc
}catch(SQLException e){} c[T@lz(!
DBUtils.closeConnection(conn); cltx(C>
} qA[cF$CIl)
} mN>(n+ly
public long getLast(){ Q+/P>5O/
return lastExecuteTime; x0%yz+i{:
} z`eMb
public void run(){ GXk
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long now = System.currentTimeMillis(); kkW }:dBl
if ((now - lastExecuteTime) > executeSep) { ^x$1Nf
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,B /b>i
//System.out.print(" now:"+now+"\n"); \%9QE
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Q,Y^9g"B`~
lastExecuteTime=now; E^A!k=>
executeUpdate(); .|Yn[?(
} +~*e B
else{ z_=V6MDM
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )||CU]"b?
} H:
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} g7lPQ_A*
} x8x-b>|$&<
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 1|AY&u%fiP
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类写好了,下面是在JSP中如下调用。 |WpJen*?Y
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<% m>3\1`ZF~<
CountBean cb=new CountBean(); =diGuIB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 4?+jvVq
CountCache.add(cb); aL&9.L|1g
out.print(CountCache.list.size()+"<br>"); dPxJ`8
CountControl c=new CountControl(); xZM4CR9]*C
c.run(); #_|O93HN'
out.print(CountCache.list.size()+"<br>"); g_!xD;0
%>