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: ,HxsU,xiG
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CountBean.java <z*SO
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/* #Pulbk8
* CountData.java l*|^mx^Q
* Gw$sL&1m\
* Created on 2007年1月1日, 下午4:44 2>3gC_^go
* e%'$Vx0kA
* To change this template, choose Tools | Options and locate the template under :H$D-pbJ4
* the Source Creation and Management node. Right-click the template and choose [9WtoA,kx
* Open. You can then make changes to the template in the Source Editor. _|S>,D'
*/ >a;^=5E
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package com.tot.count; IwIk;pB O
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/** $S Q8,Y,
* bN$!G9I!,
* @author rdsm
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*/ $Gs&'
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public class CountBean { ->oQ,ezB
private String countType; pHFh7-vj
int countId; >o=3RB=Fh
/** Creates a new instance of CountData */ _be*B+?2 t
public CountBean() {} W%f:+s}cI
public void setCountType(String countTypes){ s7CoUd2
this.countType=countTypes; \]U@=w
} \*H/YByTb
public void setCountId(int countIds){ U
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this.countId=countIds; HM])m>KeT
} JrTSu`S('
public String getCountType(){ R$&|*0
return countType; |i"A!rW
} sD$
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public int getCountId(){ I)E+
return countId; /(w:XTO<
} Z1FO.[FV
} N7%+n*Z
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CountCache.java "-y\F}TE
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/* N5rY*S
* CountCache.java U&PAs
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* JEX{jf
* Created on 2007年1月1日, 下午5:01 JbG\Ywi0]
* GdavCwJ
* To change this template, choose Tools | Options and locate the template under jK#y7E
* the Source Creation and Management node. Right-click the template and choose )^uLZMNaI
* Open. You can then make changes to the template in the Source Editor. $jb 0/
*/ #D3e\(
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package com.tot.count; e0HG"z4
import java.util.*; PKR0y%Ar
/** rm>;B
*;
* v#.FK:u}
* @author 36JVnW;
*/ BbZ-dXC<
public class CountCache { D>,]EE-
public static LinkedList list=new LinkedList(); H*3f8A&@s
/** Creates a new instance of CountCache */ ,~FyC_%*
public CountCache() {} `LnL d;Z
public static void add(CountBean cb){ V-CPq
if(cb!=null){ {nT !|S)$
list.add(cb); -[s*R%w
} 0k>NuIIP
} :tM|$TZ
} Z!C\n[R/
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CountControl.java _> .TB\
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/* 9u1)Kr=e
* CountThread.java ]DdD
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* 4x=rew>Ew
* Created on 2007年1月1日, 下午4:57 @QtJ/("&WC
* /a6\G.C5
* To change this template, choose Tools | Options and locate the template under *}3e'0`
* the Source Creation and Management node. Right-click the template and choose *Xt#04_
* Open. You can then make changes to the template in the Source Editor. r_]wa
*/ Ly\$?3h
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package com.tot.count; &by,uVb=|{
import tot.db.DBUtils; m^h"VH,
import java.sql.*; ?]f+)tCMs
/** (o{-1Dg)
* F8YD:
* @author uJMF\G=nb
*/ ~R/7J{Sg
public class CountControl{ gE JmMh
private static long lastExecuteTime=0;//上次更新时间 E8=.TM]L
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %p"x|e
/** Creates a new instance of CountThread */ m~r^@D
public CountControl() {} a@zKi;
public synchronized void executeUpdate(){ 2Ua_7
Connection conn=null; \P!v9LX(
PreparedStatement ps=null; LLg ']9
try{ TclZdk]%T
conn = DBUtils.getConnection(); g8mVjM\B;
conn.setAutoCommit(false); wCeSs=[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >DQl&:-)t
for(int i=0;i<CountCache.list.size();i++){ ~*Ve>4
CountBean cb=(CountBean)CountCache.list.getFirst(); HGB96,o f9
CountCache.list.removeFirst(); 4XQ v
ps.setInt(1, cb.getCountId()); M9]O!{sq
ps.executeUpdate();⑴ gGN[AqR
//ps.addBatch();⑵ 0F`@/C1y55
} E@"+w,x)
//int [] counts = ps.executeBatch();⑶ <!K2xb-d^
conn.commit(); Y:G6Nd
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}catch(Exception e){ B8Jev\_
e.printStackTrace(); 0gHJ%m9s
} finally{ w@.E}%bwq
try{ ):&A\nb
if(ps!=null) { I'BoP
ps.clearParameters(); DyG3|5s1R
ps.close(); 8;p6~&).C~
ps=null; kX\t0'=]
} J7emoD[
}catch(SQLException e){} %fh
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DBUtils.closeConnection(conn); =9y'6|>l
} 2#@S6zc
} )& %X
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public long getLast(){ [f.[C5f%"'
return lastExecuteTime; (p68Qe%OuG
} Q0,]Q ]_
public void run(){ -a]oN:ERb
long now = System.currentTimeMillis(); O\XN/R3
if ((now - lastExecuteTime) > executeSep) { ,y,NVF
//System.out.print("lastExecuteTime:"+lastExecuteTime); %H~q3|z
//System.out.print(" now:"+now+"\n"); =nA;,9%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %#02Z%?%
lastExecuteTime=now; 6"[`"~9'V
executeUpdate(); WUGPi'x
} sBu=@8R]y
else{ mR[J Xh9s
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ?nB).fc
} f_9%kEXICt
} m=PSCIb
} odny{ePAf
//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 `9s5 *;Z
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类写好了,下面是在JSP中如下调用。 fa/
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<% D._q'v<
CountBean cb=new CountBean(); 8G1Tpn
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); zbx,qctYo$
CountCache.add(cb); Yj/S(4(h?
out.print(CountCache.list.size()+"<br>"); mDvZ1aj
CountControl c=new CountControl(); KZ`d3ad
c.run(); QT9(s\u
out.print(CountCache.list.size()+"<br>"); WHvN6
%>