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: @ljZw(
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CountBean.java D.
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/* +$'e4EwqV
* CountData.java 7Y4%R`9H
* p-a]"l+L
* Created on 2007年1月1日, 下午4:44 _pJX1_vD
* fO0-N>W'P
* To change this template, choose Tools | Options and locate the template under +Z )`inw
* the Source Creation and Management node. Right-click the template and choose CCC4(v
* Open. You can then make changes to the template in the Source Editor. y+l<vJu
*/ ST#PMb'izn
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package com.tot.count; ;U8dm"
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/** 7eTA`@v5A
* ;.L!%$0i#
* @author `Uu^I
*/ G &m>Ov$#&
public class CountBean { [;)~nPjI
private String countType; >h|UC J1
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int countId; fQ^h{n
/** Creates a new instance of CountData */ imC&pPBB/G
public CountBean() {} :m)c[q8
public void setCountType(String countTypes){ UzXDi#Ky
this.countType=countTypes; $4ka +nfU
} \%Pma8&d
public void setCountId(int countIds){ R%Kl&c
this.countId=countIds; t!NrB X
} (q055y
public String getCountType(){ k&n\
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return countType; 4U_rB9K$
} L!`*R)I45
public int getCountId(){ }ZxW"5oq
return countId; jc3ExOH
} |L*6x
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} 9
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CountCache.java JiG8jB7%}
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/* $XU-[OF%:9
* CountCache.java D86K$IT
* ~Ay
* Created on 2007年1月1日, 下午5:01 S^*(ALFPj
* :h3#1fko
* To change this template, choose Tools | Options and locate the template under <t% Ao,"
* the Source Creation and Management node. Right-click the template and choose avF&F
* Open. You can then make changes to the template in the Source Editor. f:)]FHPB1
*/ h;&&@5@lM
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package com.tot.count; e&r+w!
import java.util.*; CR} >
/** u0<d2Y
* 3 ATN?V@
* @author \mqhugy
*/ rjq -ZrC%
public class CountCache { w; yar=n
public static LinkedList list=new LinkedList(); :/n
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/** Creates a new instance of CountCache */ 0tn7Rkiw
public CountCache() {} A0'tCq]?0
public static void add(CountBean cb){ cuJ/ Vc
if(cb!=null){ gEX:S(1QP
list.add(cb); qdg= Imx
} bvt-leA=
} r>n8`W
} Z3&XTsq
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CountControl.java 2d,wrC<'$
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/* M$DwQ}Z
* CountThread.java $6qR/#74
* >EPaZp6
* Created on 2007年1月1日, 下午4:57 pZNlcB[Qn-
* P7M0Ce~iW
* To change this template, choose Tools | Options and locate the template under ^v()iF
!
* the Source Creation and Management node. Right-click the template and choose \J#I}-a&j
* Open. You can then make changes to the template in the Source Editor. ^/4{\3
*/ ?,A8 fR
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package com.tot.count; ,58kjTM
import tot.db.DBUtils; 'dd<<E
import java.sql.*; &k {t0>
/** 5k!(#@a_T
* 4kN:=g
* @author U^WQWa
*/ pJ<)intcbE
public class CountControl{ KV3+}k
private static long lastExecuteTime=0;//上次更新时间 GLoL4el
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 lBYS>4~
/** Creates a new instance of CountThread */ {RWahnr{
public CountControl() {} hU=f?jo/
public synchronized void executeUpdate(){ ]7Xs=>"Iw
Connection conn=null; EV;;N
PreparedStatement ps=null; @)FXG~C*
try{ vErbX3RY2
conn = DBUtils.getConnection(); aTsy)=N
conn.setAutoCommit(false); p)AvG;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); f]^ J,L9qz
for(int i=0;i<CountCache.list.size();i++){ K1qY10F:_
CountBean cb=(CountBean)CountCache.list.getFirst(); c"jhbH!u4
CountCache.list.removeFirst(); V3.vE,
ps.setInt(1, cb.getCountId()); e3bAT.P
ps.executeUpdate();⑴ [9# #Kb
//ps.addBatch();⑵ -bG#h)yj
} $txWVjR?\
//int [] counts = ps.executeBatch();⑶ *HfW(C$
conn.commit(); }T&;*ww
}catch(Exception e){ 0Mzc1dG:
e.printStackTrace(); }pU!1GsO
} finally{ `^@g2c+d
try{ 6 I>xd
if(ps!=null) { G=0}IPfp
ps.clearParameters(); nY.Umj
ps.close(); YV>VA<c
ps=null; ce-m)o/
} ^Ypb"Wx8
}catch(SQLException e){} _@}MGWlAPt
DBUtils.closeConnection(conn); <CdG[Ih
} RaJ}>e
} FkkZyCqZ`
public long getLast(){ #6#BSZ E
return lastExecuteTime; ^~hhdwu3a
} _a:!U^4
public void run(){ s`7
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long now = System.currentTimeMillis(); F'T=
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if ((now - lastExecuteTime) > executeSep) { A1&>L9nUx
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7Ohu$5\
//System.out.print(" now:"+now+"\n"); L< nkI
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ]f+D& qZ B
lastExecuteTime=now; 88X*:Kf?:
executeUpdate(); )QJU]G
} }][|]/s?42
else{ =FC;d[U
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ^5iY/t~Q
} IDVY2`sM
} H;"N|pBy
} #h|,GvmF<b
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 lQ(BEv"2G[
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类写好了,下面是在JSP中如下调用。 y*TNJJ|
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<% kkuQ"^<J
CountBean cb=new CountBean(); Yk*57&QI
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 0OoO cc
CountCache.add(cb); DG%%]
out.print(CountCache.list.size()+"<br>"); #+5mpDh
CountControl c=new CountControl(); )}g4Rvr
c.run(); *p<5(-J3
out.print(CountCache.list.size()+"<br>"); ($ 1<Dj:
%>