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: 'X&"(M
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CountBean.java F)'_,.?0
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/* {}"
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* CountData.java n~w[ajC/
* Zmk 9C@
* Created on 2007年1月1日, 下午4:44 v,rKuvc'
* (]fbCH:
* To change this template, choose Tools | Options and locate the template under [["eK9}0
* the Source Creation and Management node. Right-click the template and choose |P9)*~\5
* Open. You can then make changes to the template in the Source Editor. HPO:aGU
*/ ZL!5dT&@W
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package com.tot.count; @Y9tkJIt
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/** (8W?ym
* %3HF_DNOY=
* @author R>[G6LOG
*/ K"Irg.
public class CountBean { sFgsEKs
private String countType; [*ug:PG
int countId; KmD#Ia
/** Creates a new instance of CountData */ yzNDXA.
public CountBean() {} Z y6kA\q
public void setCountType(String countTypes){ {FN4BC`3+
this.countType=countTypes; _w5c-\-PUM
} 2.a{,d
public void setCountId(int countIds){ fhki!# E8M
this.countId=countIds; Hv
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} BDi+*8
public String getCountType(){ ch/DBu
return countType; j'SGZnsy*
} H ;HFen|
public int getCountId(){ EuD$^#
return countId; \%#luk@:
} 7 z+Ngt' !
} !@)tkhP
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CountCache.java '"V]>)
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/* 9@
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* CountCache.java 2$joM`j$
* S<++eu
* Created on 2007年1月1日, 下午5:01 1z8fhE iiE
* 2&<&q J
* To change this template, choose Tools | Options and locate the template under d]^\qeG^p
* the Source Creation and Management node. Right-click the template and choose :1!k*5
* Open. You can then make changes to the template in the Source Editor. +Jq~39
*/ #\O?|bN'q
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package com.tot.count; &c81q2
import java.util.*; 04!akPP<
/** ]Mgxv>zRbs
*
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* @author t,yMO
*/ cq1)b\ |
public class CountCache { t&(\A,ch%
public static LinkedList list=new LinkedList(); xbze{9n"
/** Creates a new instance of CountCache */ }vX/55
public CountCache() {} "l-b(8n
public static void add(CountBean cb){ g;</ |Z
if(cb!=null){ [mG:PTK3
list.add(cb); ' n "n;
} @Yzb6@g"
} !4fT<V(
} !MD uj
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CountControl.java +C`zI~8
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/* @D=i|f
* CountThread.java 7j{63d`2
* fzjZiBK@
* Created on 2007年1月1日, 下午4:57 Jnq}SUev
* W0N*c*k
* To change this template, choose Tools | Options and locate the template under JO|xX<#:
* the Source Creation and Management node. Right-click the template and choose oJor
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* Open. You can then make changes to the template in the Source Editor. hXP'NS`iv
*/ Hu7WU;w
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package com.tot.count; 7!#34ue
import tot.db.DBUtils; tp3
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import java.sql.*; q-d#bKIf
/** :LX
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* +dF/$+t
* @author `EzC'e
*/ 5,K*IH
public class CountControl{ (&-!l2
private static long lastExecuteTime=0;//上次更新时间 LE4P$%>H
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Q`[J3-Q*{
/** Creates a new instance of CountThread */ A$XmO}+
public CountControl() {} sWX\/Iyy2p
public synchronized void executeUpdate(){ Om C
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Connection conn=null; s%S; 9T
PreparedStatement ps=null; >R2o7~
try{ 'n4
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conn = DBUtils.getConnection(); cR/z; *wr7
conn.setAutoCommit(false); 5vqh09-FB
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); x_BnWFP
for(int i=0;i<CountCache.list.size();i++){ #)EVi7UP
CountBean cb=(CountBean)CountCache.list.getFirst(); !6DH6<HC
CountCache.list.removeFirst(); b0lZb'
ps.setInt(1, cb.getCountId()); {N 0i
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ps.executeUpdate();⑴ ub=Bz1._
//ps.addBatch();⑵ g)Dg=3+>
} _t;Mi/\P
//int [] counts = ps.executeBatch();⑶ W)m\q}]FYz
conn.commit(); kJG0X%+w
}catch(Exception e){ 7q|51rZz
e.printStackTrace(); i[a1ij=
} finally{ ?cD2EX%(
try{ b0!ZA/YC-
if(ps!=null) { zkmfu~_)
ps.clearParameters(); !O*uQB
ps.close(); /yO|Q{C}M8
ps=null; dSw%Qv*y
} :x/L.Bz
}catch(SQLException e){} |sklY0?l(
DBUtils.closeConnection(conn); xO2CgqEb
} $kCLS7 *
} \S`|7JYW
public long getLast(){ ;Zow C#j
return lastExecuteTime; !Xf7RT
} !Au 9C
public void run(){ 3lD1G~
long now = System.currentTimeMillis(); @Zov&01
if ((now - lastExecuteTime) > executeSep) { 8^|lsB}x?
//System.out.print("lastExecuteTime:"+lastExecuteTime); $ @Fvl-lK
//System.out.print(" now:"+now+"\n"); RYem(%jq
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 'SE?IE {
lastExecuteTime=now; tX *}l|;(
executeUpdate(); |$aTJ9 Iq:
} 9$oU6#U,h
else{ &$+nuUA
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F F7
} !%s&GD8&l
}
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} Eggdj+
//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 mhZ60 RW
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类写好了,下面是在JSP中如下调用。 us
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<% FqT2+VO~
CountBean cb=new CountBean(); g8^YDrH
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [[sfuJD
CountCache.add(cb); 38Bh9>c3
out.print(CountCache.list.size()+"<br>"); vPbmQh ex
CountControl c=new CountControl(); "UDV4<|^k
c.run(); X[Q:c4'
out.print(CountCache.list.size()+"<br>"); ~xSAR;8
%>