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: K<7T}XzU$
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CountBean.java W$MEbf%1
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/* *6x^w%=A
* CountData.java |e-+xX|;
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* Created on 2007年1月1日, 下午4:44 :Ye#NPOI
* d>"$^${
* To change this template, choose Tools | Options and locate the template under X @jYQ.
* the Source Creation and Management node. Right-click the template and choose K^qUlyv
* Open. You can then make changes to the template in the Source Editor. Oi%~8J>
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package com.tot.count; Hv7D+j8M
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/** .'2gJ"?,
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* @author ZNC?Ntw
*/ e}O -I
public class CountBean { NF\^'W@N
private String countType; gJFpEA {
int countId; $*)(8C l
/** Creates a new instance of CountData */ F']%q 0
public CountBean() {} U;Y}2
public void setCountType(String countTypes){ aj'8;E+
this.countType=countTypes; rIWN!@.J
} h`;F<PFW
public void setCountId(int countIds){ yJ`1},^
this.countId=countIds; |9"^s x
} =|V]8 tN
public String getCountType(){ Rb}&c)4
return countType; ^`r|3c0
} [BR}4(7
public int getCountId(){ RJsG]`
return countId; `"=L
} u-M$45vct
} )E~\H+FP6
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CountCache.java L\?g/l+k
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/* . N} }cJq
* CountCache.java @NwM+^
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* Created on 2007年1月1日, 下午5:01 jc~*#\N
* AXv;r<
* To change this template, choose Tools | Options and locate the template under iGeT^!N
* the Source Creation and Management node. Right-click the template and choose #.L0]Uqcp
* Open. You can then make changes to the template in the Source Editor. 3)Awj++
*/ T0"0/{5-_
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package com.tot.count; }~~^ZtJ\
import java.util.*; )7%]<2V%
/**
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* @author c^)E:J/
*/ qkG;YGio
public class CountCache { .,K?\WZ
public static LinkedList list=new LinkedList(); ~0r.3KTl"Y
/** Creates a new instance of CountCache */
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public CountCache() {} Qufv@.'AY
public static void add(CountBean cb){ Y{|~A
if(cb!=null){ l=?y=2+
list.add(cb); =2)$|KC
} /(pD^D
} z,x"vK(
} 2m_M9e\
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CountControl.java F j('l
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/* <Jrb"H[T"
* CountThread.java 7b%Cl
* K2K6
* Created on 2007年1月1日, 下午4:57 4_0/]:~5
* Vg~
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* the Source Creation and Management node. Right-click the template and choose Z=[a 8CU
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*/ Z3~*R7G8>
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package com.tot.count; q>4i0p8^
import tot.db.DBUtils; O36r
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import java.sql.*; C|@k+^S
/** 4
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* @author ,(W98}nB
*/ z\d2T%^:g(
public class CountControl{ UKQ&TV}0
private static long lastExecuteTime=0;//上次更新时间 2.2a2.I1
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 JJ=is}S|
/** Creates a new instance of CountThread */ "{"2h>o#D}
public CountControl() {} lBZ*G
public synchronized void executeUpdate(){ nGgc~E$j
Connection conn=null; ?,DbV|3_\
PreparedStatement ps=null; Xq!tXJ)
try{ 5GL+j%7
conn = DBUtils.getConnection(); G-?9;w'@
conn.setAutoCommit(false); b<78K5'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); NRF%Qd8I/2
for(int i=0;i<CountCache.list.size();i++){ wggHUr(g,
CountBean cb=(CountBean)CountCache.list.getFirst(); FtDAk?
CountCache.list.removeFirst(); }v,P3
ps.setInt(1, cb.getCountId()); j6(IF5MqP
ps.executeUpdate();⑴ q$'&R