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: @XtrC|dkkE
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CountBean.java `^^t#sT
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/* $,/E"G`
* CountData.java N3\RXXY
* 2p;I<C:Eo
* Created on 2007年1月1日, 下午4:44 H? z~V-8
* 2BF455e
* To change this template, choose Tools | Options and locate the template under O>nMeU
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. ackeq#
*/ P`Now7!
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package com.tot.count; O#[b NLV
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/**
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* B-KMlHe
* @author n^|xp;] :
*/ &0bq3JGW
public class CountBean { "HqmS
private String countType; tw
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int countId; RR+kjK?
/** Creates a new instance of CountData */ P/WGB~NH
public CountBean() {} @uV]7d"z(
public void setCountType(String countTypes){ M1NdlAAf
this.countType=countTypes; ??.aLeF&
} 2NjgLXP
public void setCountId(int countIds){ a]5y
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this.countId=countIds; rf]z5;
} SYsO>`/ )
public String getCountType(){ WH39=)D%u
return countType; i
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} E`qX|n
public int getCountId(){ CC3i@
return countId; D8~\*0->
} )h0>e9z>Y
} z<fd!g+^
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CountCache.java d&|5Rk
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/* 7_j t =sr
* CountCache.java mM?,e7Xhs
* 3 i>NKS
* Created on 2007年1月1日, 下午5:01 eE
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* <=6F=u3PtU
* To change this template, choose Tools | Options and locate the template under 1oiSmW\
* the Source Creation and Management node. Right-click the template and choose M,ybj5:6
* Open. You can then make changes to the template in the Source Editor. hPG@iX|V
*/ )l
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package com.tot.count; <Dgf'GrJ
import java.util.*; gq*W 0S
/** T@P~A)>yo
* tg 'g R
* @author : 4-pnn
*/ Dmy=_j?ej
public class CountCache { :~W(#T,$E
public static LinkedList list=new LinkedList(); [9 :9<#?o^
/** Creates a new instance of CountCache */ z ULHgG
public CountCache() {} PcZ<JJ16F$
public static void add(CountBean cb){ |unvDXx-
if(cb!=null){ ,/V~T<FI
list.add(cb); pnx^a}|px
} adri02C/
} H<ovIMd
}
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CountControl.java 9mXmghoCO
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/* jz;{,F
* CountThread.java FwB xag:u
* <v_Wh@m
* Created on 2007年1月1日, 下午4:57 CXz9bhn<4
* FcZ)^RQ4G
* To change this template, choose Tools | Options and locate the template under reYIF*
* the Source Creation and Management node. Right-click the template and choose hMS:t(N{
* Open. You can then make changes to the template in the Source Editor. <liprUFsn
*/ A@d 2Ukv
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package com.tot.count; vNdX
import tot.db.DBUtils; 7 u Q +]d
import java.sql.*; go6;_
/** (Lh!7g/0N
* eS4t0`kP
* @author VE/m|3%t
*/ izl-GitP
public class CountControl{ 1lA? 5:
private static long lastExecuteTime=0;//上次更新时间 ir\)Hz2P
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 !U2<\!_
/** Creates a new instance of CountThread */ HL$7Ou
public CountControl() {} [K4k7$
public synchronized void executeUpdate(){ .)%,R
Connection conn=null; ~^'t70 :D
PreparedStatement ps=null; ,+v(?5[6
try{ KX!/n`2u
conn = DBUtils.getConnection(); (Lj*FXmz
conn.setAutoCommit(false); ^jpQfD e6
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); iDgc$'%?
for(int i=0;i<CountCache.list.size();i++){ -R];tpddR5
CountBean cb=(CountBean)CountCache.list.getFirst(); x+%> 2qgj"
CountCache.list.removeFirst(); Cl&)#
ps.setInt(1, cb.getCountId()); b 5K"lPr
ps.executeUpdate();⑴ h?4EVOx+
//ps.addBatch();⑵ TL$w~dY
} `RU RC"
//int [] counts = ps.executeBatch();⑶ cR55,DR,#W
conn.commit(); ih75C"
}catch(Exception e){ 5__B
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e.printStackTrace(); V}2[chbl
} finally{ Lq6nmjL
try{ ~SA>$
if(ps!=null) { bh\2&]Di/
ps.clearParameters(); ;Tq4!w'rH
ps.close(); apM)$
ps=null; [?,+DY
} #\xy,C'Y
}catch(SQLException e){} 3FO-9H
DBUtils.closeConnection(conn); ,|zwY~lt5
} 4pcIH5)z
} u~'_Uqp
public long getLast(){ ,}>b\(Lk
return lastExecuteTime; \>j@!W
} UIIsgNca
public void run(){ ]*)l_mut7
long now = System.currentTimeMillis(); i"DyXIrk2
if ((now - lastExecuteTime) > executeSep) { td$RDtW[3
//System.out.print("lastExecuteTime:"+lastExecuteTime); C\{hN
//System.out.print(" now:"+now+"\n"); ^
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pD~."fb
lastExecuteTime=now; M[iWWCX
executeUpdate(); 37tJ6R6[
} YF;2jl Nm
else{ 4@ny%_/
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); J=O_nup6C
} `tKs|GQf
} ^foCcO
} $Grk{]nT
//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 I>-1kFma;
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类写好了,下面是在JSP中如下调用。 pf yJL?_%
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<% Ib/e\+H\
CountBean cb=new CountBean(); z<yqQ[
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 7o*~zDh@fH
CountCache.add(cb); /6 x[C
out.print(CountCache.list.size()+"<br>"); PCc{0Rp\vk
CountControl c=new CountControl(); D7B g!*
c.run(); iM8l,Os]<f
out.print(CountCache.list.size()+"<br>"); }^n"t>Z8
%>