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: 8zj&e8&v
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CountBean.java .nrbd#i-
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/* 6LGl]jHf
* CountData.java o ^UOkxs.
* sRT H_]c
* Created on 2007年1月1日, 下午4:44 _",(!(
* L@6]~[JvP
* To change this template, choose Tools | Options and locate the template under KhB775
* the Source Creation and Management node. Right-click the template and choose eUB!sR%
* Open. You can then make changes to the template in the Source Editor. O)VcW/
*/ *Ic^9njt
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package com.tot.count; *p\Zc*N;%
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/** K2xHXziQ
* : q%1Vi
* @author <iU@ M31
*/ np6G~0Y`
public class CountBean { 2v4K3O60G
private String countType; ^IuhHP
int countId; a?r$E.W'&
/** Creates a new instance of CountData */ r2.w4RMFua
public CountBean() {} Qr~!YPK\
public void setCountType(String countTypes){ qwj7CIc(
this.countType=countTypes; r1<*=Fs=>>
} g%S/)R,,ct
public void setCountId(int countIds){ 7:uz{xPK6
this.countId=countIds; AmDOv4
}
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public String getCountType(){ |a#ikY _nd
return countType; IA.7If&k
} [j'!+)>_
public int getCountId(){ ;iKtv+"
return countId; fv8x7l7
} S8/~'<out
} JP6 Noia
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CountCache.java 7UW\|r
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/* ]3Ia>i
* CountCache.java CV"}(1T
* Q`AlK"G,
* Created on 2007年1月1日, 下午5:01 !PEKMDh
* FauASu,A
* To change this template, choose Tools | Options and locate the template under sa o &
* the Source Creation and Management node. Right-click the template and choose zM&ro,W
* Open. You can then make changes to the template in the Source Editor. :AztHf?X
*/ ~<VxtcEBz
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package com.tot.count; HSG Ln906
import java.util.*; H6 x
/** Y3:HQ0w`|
* W)Y`8&,
* @author 6&SNFOX{@
*/ zytN leyc
public class CountCache { Q2m[XcnX
public static LinkedList list=new LinkedList(); m6BUKX\m
/** Creates a new instance of CountCache */ Ii[U%
public CountCache() {} L$OZ]
public static void add(CountBean cb){ ^\O*e)#*
if(cb!=null){ _^GBfM.
list.add(cb); MjC<N[WO>N
} TCyev[(
} _yN5sLLyb
} $aJay]F
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CountControl.java T=42]h
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/* !vu-`u~86
* CountThread.java #
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* #`|Nm3b
* Created on 2007年1月1日, 下午4:57 V9"R8*@-
* h?n?3x!(
* To change this template, choose Tools | Options and locate the template under _%2ukuJ `
* the Source Creation and Management node. Right-click the template and choose w(ZZTVW-
* Open. You can then make changes to the template in the Source Editor. R)Mkt8v
*/
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package com.tot.count; X(BxC<!D.
import tot.db.DBUtils; nN<,rN{:
import java.sql.*; z3S"1L7
/** =h-EN_[
* |Sjy
* @author !% W5@tN
*/ 8ly)G
public class CountControl{ K(upzn*a
private static long lastExecuteTime=0;//上次更新时间 06AgY0\
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 gw,K*ph}q
/** Creates a new instance of CountThread */ >^g2Tg:
public CountControl() {} 7 "'PfP4c
public synchronized void executeUpdate(){ A8mc+ Bf(
Connection conn=null; J Y8Rk=
PreparedStatement ps=null; -d4v:Jab
try{
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conn = DBUtils.getConnection(); 6?M/71
conn.setAutoCommit(false); klQmo30i
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 8493Sw
for(int i=0;i<CountCache.list.size();i++){ o#wly%i')
CountBean cb=(CountBean)CountCache.list.getFirst(); [nV BnB
CountCache.list.removeFirst(); sv%E5@
ps.setInt(1, cb.getCountId()); 5<PNl~0
ps.executeUpdate();⑴ qtAt=` s
//ps.addBatch();⑵ --l
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} vJ&D>Vh4e
//int [] counts = ps.executeBatch();⑶ xOShO"4Z
conn.commit(); xP_%d,
}catch(Exception e){ }W 5ks-L6
e.printStackTrace(); u5ZyOZ;
} finally{ ~3gazTe9
try{ l@GJcCufE
if(ps!=null) { hE=xS:6
ps.clearParameters(); 6ZHeAb]"
ps.close(); 3^wHL:u
ps=null;
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} P/ 6$TgQ
}catch(SQLException e){} Lwi"K8.u
DBUtils.closeConnection(conn); ^TZmc{i
} hL/u5h%$
} -|}?+W
public long getLast(){ 9rz$c, Y(
return lastExecuteTime; UJqh~s
} n5"oXpcIx
public void run(){ J7",fb
long now = System.currentTimeMillis(); ELnUpmv\
if ((now - lastExecuteTime) > executeSep) { cFq<x=S
//System.out.print("lastExecuteTime:"+lastExecuteTime); -DHzBq=H
//System.out.print(" now:"+now+"\n"); 3\P*"65
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Gf#l ^yr
lastExecuteTime=now; e6_8f*o|s
executeUpdate(); pEcYfj3M
} L%$-?O|
else{ 9b=0
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); , 2#Q>
} dO z|CfUhI
} |z3!3?%R
} @R`6jS_gK
//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 D
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类写好了,下面是在JSP中如下调用。 IYq#|^)5+
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<% 0^V<,CAV
CountBean cb=new CountBean(); 7NT}
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); s|XWw<Sa
CountCache.add(cb); (Ox&B+\v+v
out.print(CountCache.list.size()+"<br>"); @:CM<+
CountControl c=new CountControl(); cA4?[F
c.run(); WynTU?
out.print(CountCache.list.size()+"<br>"); .F@Lx45
%>