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: 2h=QJgpCG
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CountBean.java 4v[Zhf4JM
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/* 7LotN6H
* CountData.java qXF#qS-28
* ]*/%5ZOI&
* Created on 2007年1月1日, 下午4:44 dMw7UJ
* zDK"Y{
* To change this template, choose Tools | Options and locate the template under k`aHG8S\
* the Source Creation and Management node. Right-click the template and choose qnO>F^itF
* Open. You can then make changes to the template in the Source Editor. W=-:<3XL
*/ /9QC$Z):<
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package com.tot.count; A!GQ4.~%
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/** b+/z,c6w
* W)~}o<a)[
* @author ] Hiw+5n
*/ 5Z]]xR[
public class CountBean { q$iGeE#
private String countType; ^}Wk
int countId; &=>|? m8
/** Creates a new instance of CountData */ aGz$A15#
public CountBean() {} B'}pZOa[Wb
public void setCountType(String countTypes){ z%lLbKSe
this.countType=countTypes; ]@P!Q&V #
} H$M{thW
public void setCountId(int countIds){ ,v@C=4'm
this.countId=countIds; /:GeXDJw
} v$d^>+Y#
public String getCountType(){ ]8o[&50y
return countType; e8,!x9%J
} hVGK%HCz&
public int getCountId(){ 7;rf$\-&
return countId; ^| r6>b
} _C4N6YdU
} XF Cwa
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CountCache.java 1e)5D& njS
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/* Cj5=UUnO
* CountCache.java @AfC$T
* &6O0h0Vy
* Created on 2007年1月1日, 下午5:01 \Y$@$)
* D:=Q)Uh0I
* To change this template, choose Tools | Options and locate the template under ^&!iq K2o
* the Source Creation and Management node. Right-click the template and choose [~5<['G
* Open. You can then make changes to the template in the Source Editor. t2Y2v2 J
*/ I&Z+FL&@f
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package com.tot.count; L|y9T{s
import java.util.*; *-,jIaL;
/** Mh@RO|F
* {^A,){uX]
* @author 60XTdJkDkA
*/ njGZ#{"eC
public class CountCache { \J-}Dp\0b
public static LinkedList list=new LinkedList(); ]yV,lp
/** Creates a new instance of CountCache */ 78h!D[6
public CountCache() {} %pUA$oUt
public static void add(CountBean cb){ J`'wprSBb
if(cb!=null){ h=o%\F4
list.add(cb); p/ au.mc
} Mh"vH0\Lj
} XtftG7r9S
} c.{t +OR
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CountControl.java YF$nL(
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/* W8N__
* CountThread.java s<'WTgy1i
* #McX
* Created on 2007年1月1日, 下午4:57 t2hI^J0y
* <d~IdK'\x
* To change this template, choose Tools | Options and locate the template under Fx3 X
* the Source Creation and Management node. Right-click the template and choose 7OdJ&Gzd
* Open. You can then make changes to the template in the Source Editor. /;;$9O9
*/ "}^}3"/.
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package com.tot.count; p"|0PlW
import tot.db.DBUtils; ?F^O7\rw
import java.sql.*; $0,lE+7*
/** z|v/hUrD
* 5-! Zm]
* @author Q=?YY-*$
*/ \qw1\-q
public class CountControl{ +z O.|`+
private static long lastExecuteTime=0;//上次更新时间 $^5c8wT
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 bOdQ+Y6
/** Creates a new instance of CountThread */ HSlAm&Y\
public CountControl() {} ppR;v
public synchronized void executeUpdate(){ L8~zQV$h
Connection conn=null; b@ OF
PreparedStatement ps=null; bF c
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try{ ve*m\DU
conn = DBUtils.getConnection(); fK10{>E1
conn.setAutoCommit(false); O)D+u@RhH
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); @,;VMO
for(int i=0;i<CountCache.list.size();i++){ H:4?sR3
CountBean cb=(CountBean)CountCache.list.getFirst(); rtT*2k*
CountCache.list.removeFirst(); v@Bk)Z
ps.setInt(1, cb.getCountId()); 7CSd}@71\
ps.executeUpdate();⑴ &w{:
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//ps.addBatch();⑵ a]t| /Mq
} wvPS0]
//int [] counts = ps.executeBatch();⑶ ^-g-]?q
conn.commit(); B
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}catch(Exception e){ j%Wip j;c
e.printStackTrace(); I9hZ&ed16
} finally{ dw3H9(-lp
try{ `s~[q
if(ps!=null) { H{ +[
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ps.clearParameters(); ;hCUy=m.
ps.close(); !Nx'4N`&l
ps=null; I`S?2i2H
} N'=b8J-fF
}catch(SQLException e){} R:,
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DBUtils.closeConnection(conn); XG8UdR|
} )|`w;F>
} n1)~/
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public long getLast(){ {8w,{p`
return lastExecuteTime; qU+qY2S:
} nD}CQ_C
public void run(){ pg/SYEvsV
long now = System.currentTimeMillis(); cb`ik)=K%
if ((now - lastExecuteTime) > executeSep) { e6
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//System.out.print("lastExecuteTime:"+lastExecuteTime); \PM5B"MDZ
//System.out.print(" now:"+now+"\n"); p&W{g$D>
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f!13Ob<8r
lastExecuteTime=now; P*3PDa@
executeUpdate(); * %w8bB
} 2'7)D}p
else{ :0vKt 6>Sp
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 8~:s$~&r
} !H4C5wDu
} !f)^z9QX8
} r@ v&~pL
//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 ;C~:C^Q\H
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类写好了,下面是在JSP中如下调用。 1aS66TS3
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<% W7?f_E\>W
CountBean cb=new CountBean(); 3GM9ZPeN:
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Km!~zG7<
CountCache.add(cb); NzG] nsw
out.print(CountCache.list.size()+"<br>"); 6'ia^om
CountControl c=new CountControl(); Ae^Idz
c.run(); P"<,@Mn
out.print(CountCache.list.size()+"<br>"); Ag_I'
%>