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: 3]iBX`Ni
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CountBean.java e I 6G
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/* Ak\w)!?s
* CountData.java ]qLro<
* ua^gG3n0
* Created on 2007年1月1日, 下午4:44 (Es0n$Xb
* N>'T"^S/
* To change this template, choose Tools | Options and locate the template under d1`us G"
* the Source Creation and Management node. Right-click the template and choose cTR@
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* Open. You can then make changes to the template in the Source Editor. T%\f$jh6
*/ ^nS'3g^"
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package com.tot.count; .<!Jhf$
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/** .-6B6IEI_"
* >$.lM~k
* @author LJ+fZ
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*/ @\=%M^bx
public class CountBean { iYyJq;S
private String countType; B tZycI
int countId; 8u401ddg
/** Creates a new instance of CountData */ l9%oKJ;
public CountBean() {} qOV6Kh)
public void setCountType(String countTypes){ pErre2fS
this.countType=countTypes; ,MtN_V-
} {M5[gr%
public void setCountId(int countIds){ W+'|zhn
this.countId=countIds; #Zm%U_$<
} \*5_gPj!d
public String getCountType(){ T =l4Vb{>
return countType; j>5D4}*]f
} %Tn0r|K
public int getCountId(){ :d7tzYT ^
return countId; M]+FTz
} 6n
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} !i|]OnJY
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CountCache.java O%(E 6
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/* M=57 d7
* CountCache.java "0lC:Wu]
* 1w)#BYc=L
* Created on 2007年1月1日, 下午5:01 4mG?$kCN
* kc3dWWPe
* To change this template, choose Tools | Options and locate the template under PuuO2TZ
* the Source Creation and Management node. Right-click the template and choose Z.Sq5\d
* Open. You can then make changes to the template in the Source Editor. kO]],Vy`
*/ @y (9LSs
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package com.tot.count; r&G=}ZMO
import java.util.*; } #[MV+D
/** 7yU<!p?(
* ?0Qm
* @author pN[G?A
*/ Kh!h_
public class CountCache { tr]=q9
public static LinkedList list=new LinkedList(); =)B@ `"
/** Creates a new instance of CountCache */ 3MR4yw5v
public CountCache() {} LM*#DLadk
public static void add(CountBean cb){ _pXy}D
if(cb!=null){ Z|FWQ8gZ4m
list.add(cb); ;+dB-g[
} =]pcC
} #gw ys
} hJ+;N
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CountControl.java >k6RmN
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/* OZ*V7o
* CountThread.java Bu ~N)^
* "]%.%$
* Created on 2007年1月1日, 下午4:57 Yy4?|wVl
* YGBVGpE9
* To change this template, choose Tools | Options and locate the template under 3w=OvafT:
* the Source Creation and Management node. Right-click the template and choose k+au42:r
* Open. You can then make changes to the template in the Source Editor. tFvc~zz9
*/ Zhl}X!:c?\
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package com.tot.count; 8+Y+\XZG
import tot.db.DBUtils; .[v4'ww^
import java.sql.*; ,8KD-" l^g
/** 0L
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* PKoB~wLH
* @author <z3:*=!
*/ 3[RbVT
public class CountControl{ cO,ELu
private static long lastExecuteTime=0;//上次更新时间 3Z* '
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 NR8YVO)5$
/** Creates a new instance of CountThread */ v2>.+Eh#
public CountControl() {} pPUv8, %
public synchronized void executeUpdate(){ HWFI6N
Connection conn=null; w6k\po=
PreparedStatement ps=null; {iGk~qN
try{ niZ/yW{w
conn = DBUtils.getConnection(); @$R[Js%MuO
conn.setAutoCommit(false); 9rr"q5[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); dMAd-q5{
for(int i=0;i<CountCache.list.size();i++){ -[cl]H)V
CountBean cb=(CountBean)CountCache.list.getFirst(); 2Uf}gG)
CountCache.list.removeFirst(); l@ +]XyLj
ps.setInt(1, cb.getCountId()); ~.;S>o[
ps.executeUpdate();⑴ tL?nO#Qx
//ps.addBatch();⑵ #x"dWi(
} #]ZOi`;
//int [] counts = ps.executeBatch();⑶ =='~g~
conn.commit(); 7l"N%e
}catch(Exception e){ Zh?1+Sz&
e.printStackTrace(); . Q3GA0O
} finally{ i^[yGXtW
try{ V9:h4]
if(ps!=null) { DP=4<ES%+
ps.clearParameters(); n3, ?klK
ps.close(); y*,3P0*z
ps=null; <<@vy{*Hg
} aB9Pdut
}catch(SQLException e){} ?UAB}CjY
DBUtils.closeConnection(conn); IfHB+H
} M<t>jM@'A#
} ,LjB%f[
public long getLast(){ xP<cF
return lastExecuteTime; Sb=cWn P
} f
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public void run(){ q' };.tv
long now = System.currentTimeMillis(); |Uz?i7z
if ((now - lastExecuteTime) > executeSep) { \Uun2.K
//System.out.print("lastExecuteTime:"+lastExecuteTime); gkdd#Nrk
//System.out.print(" now:"+now+"\n"); =]h 5RC
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); }(AgXvRq
lastExecuteTime=now; #un#~s
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executeUpdate(); M6E.!Cs
} @Oe!*|?mS
else{ Py$*c
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 5gP#V
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} `nA_WS
} U88-K1G
} YYDLFtr2
//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 >|jSd2_p
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类写好了,下面是在JSP中如下调用。 S$q:hXZ#e
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<% h>,yqiY4p
CountBean cb=new CountBean(); "j5b$T0P>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); IxwOzpr
CountCache.add(cb); &:g5+([<