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: l!AZ$IV
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CountBean.java ` 4EOy:a
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/* !RcAJs'
* CountData.java T (2,iG8
* y]jh*KD[
* Created on 2007年1月1日, 下午4:44 Mz++SPG7
* ^Js9E
* To change this template, choose Tools | Options and locate the template under c?R.SBr,'
* the Source Creation and Management node. Right-click the template and choose _TPo=}Z
* Open. You can then make changes to the template in the Source Editor. jATU b-
*/ H4:TYh
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package com.tot.count; omjLQp[%
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/** [d&Faa[`
* BWPYHWW}E
* @author *>'R
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*/ ABHZ)OM
public class CountBean { CQ( @7
private String countType; \7j)^
int countId; kxn;;
/** Creates a new instance of CountData */ >rFvT>@NU
public CountBean() {} GC\/B0!
public void setCountType(String countTypes){ BkZ%0rw%
this.countType=countTypes; KncoIw
} 'j)eqoj
public void setCountId(int countIds){ `2fuV]FW
this.countId=countIds; E7h}0DX
} sMS`-,37u
public String getCountType(){ "G,*Z0V5
return countType; |wb7`6g
} |fI%L9
public int getCountId(){ ^r& {V"l]
return countId; ?0(B;[xEJ
} cY"^3Ot%^
} *tO<wp&
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CountCache.java (;j7{(
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/* K`X2N
* CountCache.java #`fT%'T!
* |@g1|OWd|
* Created on 2007年1月1日, 下午5:01 XGoy#h
* zc1Zuco|
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* To change this template, choose Tools | Options and locate the template under L,D>E
* the Source Creation and Management node. Right-click the template and choose /r%+hS
* Open. You can then make changes to the template in the Source Editor. $F-XXBp
*/ ".0W8=
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package com.tot.count; 72,iRH
import java.util.*; y%,BDyK
/** $~YuS_sYg
* c~'kW`sNV
* @author lX4p'R-h
*/ 2bJFlxEU
public class CountCache { _-&.=3\1
public static LinkedList list=new LinkedList(); lewDR"0Kx
/** Creates a new instance of CountCache */ 'AAY!{>
public CountCache() {} fA8+SaXW%
public static void add(CountBean cb){ Fq9[:
if(cb!=null){ 3-R3Qlr
list.add(cb); 0hkuBQb\
} yn#h$o<
} A%PPG+IfA
} l17ZNDzLU
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CountControl.java $aA.d^
#~x5}8
/* *[5
* CountThread.java eI}VH BAz
* HIq1/)
* Created on 2007年1月1日, 下午4:57 RrHnDO'
* >&&xJ5
* To change this template, choose Tools | Options and locate the template under U YQ$c }Z5
* the Source Creation and Management node. Right-click the template and choose Pp/{keEye
* Open. You can then make changes to the template in the Source Editor. ! -c*lb
*/ _6m3$k_[MJ
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package com.tot.count; QB[s8"S
import tot.db.DBUtils; K|G$s
import java.sql.*; ja;5:=8A5
/** Vi#im`@
* >>$|,Q-.
* @author lz (,;I'x
*/ %)9]dOdOk
public class CountControl{ T,uIA]
private static long lastExecuteTime=0;//上次更新时间 x5SQ+7
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V</T$V$
/** Creates a new instance of CountThread */ >u)ZT
public CountControl() {} JC"K{V{
public synchronized void executeUpdate(){ T]|O/
Connection conn=null; s.sy7%{
PreparedStatement ps=null; 'u[o`31.
try{ >t2b?(h/x
conn = DBUtils.getConnection(); Y/0O9}hf
conn.setAutoCommit(false);
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $Jm2,Yv
for(int i=0;i<CountCache.list.size();i++){ hPxI&
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CountBean cb=(CountBean)CountCache.list.getFirst(); `&_k\/
CountCache.list.removeFirst(); 1J"9r7\
ps.setInt(1, cb.getCountId()); <~M9nz(<