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: 8rwXbYx
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CountBean.java loPBHoE3@H
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/* O=LiCSNEV
* CountData.java >u)DuZXj
* o}4J|@Hi|4
* Created on 2007年1月1日, 下午4:44 UAi] hUq
* 540,A,>:tb
* To change this template, choose Tools | Options and locate the template under Sd0y=!Pj=
* the Source Creation and Management node. Right-click the template and choose v%6mH6V
* Open. You can then make changes to the template in the Source Editor. :n t\uwh
*/ !W ,pjW%Y
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package com.tot.count; M~/R1\'&j
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/** `aw5"ns^V
* hXE_OXZ
* @author b=-LQkcZhK
*/ $6 A91|ZSQ
public class CountBean { a6v ls]?
private String countType; uNcE_<
int countId; lh?TEQ
/** Creates a new instance of CountData */ ,{_;q:
public CountBean() {} -P5M(Rt
public void setCountType(String countTypes){ O%n =n3
this.countType=countTypes; DKGZm<G>
} 9:l@8^_o
public void setCountId(int countIds){ R6KS&Ge_
this.countId=countIds; ==z,vxr
} ;:)?@IuSy
public String getCountType(){ &InMI#0mV
return countType; h+rrmC
} e%O]U:Z
public int getCountId(){ 0,x<@.pW
return countId; EN!Q]O|
} :',Q6j( s
} ~dO&e=6Hk
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CountCache.java F;&a=R!.
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/* ~Uet)y<
* CountCache.java oy)'wb~
* Pd[&&!+gV
* Created on 2007年1月1日, 下午5:01 ZTwCFn
* NpIx\\d
* To change this template, choose Tools | Options and locate the template under ^:c"%<"='
* the Source Creation and Management node. Right-click the template and choose D`G ;kp
* Open. You can then make changes to the template in the Source Editor. XtV=Gr8"
*/ ]1XJQW@gF
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package com.tot.count; #ir~v>J||
import java.util.*; jcT
/** CAPPOh
* JTxHM?/G
* @author Td`0;R'<}c
*/ dGrm1w
public class CountCache { [MkXQwY
public static LinkedList list=new LinkedList(); HP
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/** Creates a new instance of CountCache */ [7:(e/&
public CountCache() {} '#fwNbD
public static void add(CountBean cb){ mJ3|UClPS
if(cb!=null){ <CJ`A5N
list.add(cb); sBo|e]m#
} pM^r8kIH
} zeZ}P>C
} r^$4]@Wn
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CountControl.java 9Fkzt=(E~
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/* nDhD"rc
* CountThread.java ]} +
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* V+M=@Pvp9
* Created on 2007年1月1日, 下午4:57 #!WD1a?L
* pd[?TyVK;
* To change this template, choose Tools | Options and locate the template under kdX]Afyj
* the Source Creation and Management node. Right-click the template and choose X8Xw'
* Open. You can then make changes to the template in the Source Editor. 5V^+;eO
*/ \Q5Jg
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package com.tot.count; Z3)l5JG)
import tot.db.DBUtils; ezC2E/#
import java.sql.*; : Nf-}"
/** F^v <z)x
* Zu$30&U
* @author j;|rI`67~
*/ @\=%M^bx
public class CountControl{ HZ#<+~J
private static long lastExecuteTime=0;//上次更新时间 f_&bwfbo
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8u401ddg
/** Creates a new instance of CountThread */ l9%oKJ;
public CountControl() {} 3r)<:4a
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public synchronized void executeUpdate(){ ^_cR
Connection conn=null; c%|18dV
PreparedStatement ps=null; jNIZ!/K
try{ tyH*epanw
conn = DBUtils.getConnection(); {=Y.Z1E:
conn.setAutoCommit(false); B@Ae2_;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); m 8Q[+_:$H
for(int i=0;i<CountCache.list.size();i++){ YXR%{GUP[
CountBean cb=(CountBean)CountCache.list.getFirst(); j^g^=uau
CountCache.list.removeFirst(); Vko1{$}t
ps.setInt(1, cb.getCountId()); W* XG9
ps.executeUpdate();⑴ !]W}I
//ps.addBatch();⑵ 5jpb`Axj#
} f/r@9\x
//int [] counts = ps.executeBatch();⑶ p&:(D=pIu
conn.commit(); RSNukg
}catch(Exception e){ -qPYm?$
e.printStackTrace(); d@:4se-q+
} finally{ s5s'$|h"
try{ jH1!'1s|
if(ps!=null) { vq df-i
ps.clearParameters(); X"KX_)GZD
ps.close(); drJ<&1O
ps=null; Uv(THxVh
} SLa\F
}catch(SQLException e){} )_bR"!Z
DBUtils.closeConnection(conn); O~r.sJ}
} +~6gP!
} >lo,0oG
public long getLast(){ gCMwmanX
return lastExecuteTime; @q?zh'@;
} nJ.<yrzi
public void run(){ %CxrXU
long now = System.currentTimeMillis(); f2sv$#'
if ((now - lastExecuteTime) > executeSep) { -m&