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: .>(?c92
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CountBean.java J.`z;0]op
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/* (okCZ-_Jn
* CountData.java h=q%h8
* V/0?0VKG
* Created on 2007年1月1日, 下午4:44 &M)S~Hb^
* =jik33QV<
* To change this template, choose Tools | Options and locate the template under XsldbN^6
* the Source Creation and Management node. Right-click the template and choose mErXdb|L
* Open. You can then make changes to the template in the Source Editor. `0r=ND5.
*/ }OeEv@^
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package com.tot.count; +s6wF{
CS 7"mE`{
/** 5G~; g
* lR!Sdd} -
* @author ~&/|J)}
*/ &FWPb#
public class CountBean { &`a$n2ycy
private String countType; HQ%-e5Q
int countId; hT&,5zaWdv
/** Creates a new instance of CountData */ lN,8(n?g
public CountBean() {} guC/eSxv
public void setCountType(String countTypes){ Lw=.LN
this.countType=countTypes; r<;bArs-u
} Fj9/@pe1
public void setCountId(int countIds){ .+G),P)
this.countId=countIds; w;.'>ORC
} (/&IBd-
public String getCountType(){ -aiQp@^/J
return countType; #@,39!;,:O
} e`Xy!@`_
public int getCountId(){ Na^1dn
return countId; XA~Rn>7&H
} :&=TE 2
} 9.|+KIRb
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CountCache.java ?~rF3M.=|
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/* lrjlkgSN
* CountCache.java 4#uWj?u
* 'sJ=h0d_[V
* Created on 2007年1月1日, 下午5:01 N2_j[Pe
* 9?r|Y@xh ]
* To change this template, choose Tools | Options and locate the template under /"?y @;Y~
* the Source Creation and Management node. Right-click the template and choose d"+zDc;
* Open. You can then make changes to the template in the Source Editor. yhe$A<Rl=
*/ 9<5SQ
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package com.tot.count; ZVpMR0!
import java.util.*; C
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/** v*5n$UFV
* TX]4Y953D
* @author sk!v!^\_r
*/ i^(_Gk
public class CountCache { B^Q\l!r
public static LinkedList list=new LinkedList(); 4KE"r F
/** Creates a new instance of CountCache */ v'B++-%
public CountCache() {} [7?K9r\#
public static void add(CountBean cb){ CzxU
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if(cb!=null){
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list.add(cb); gZgb-$b
} zpr`
} ks7g*; 3{@
} M#on-[
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CountControl.java V\@h<%{^%7
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/* 9i WDEk
* CountThread.java K1Nhz'^=D
* <CJua1l\
* Created on 2007年1月1日, 下午4:57 I!.o&dk
* AwB ]0H
* To change this template, choose Tools | Options and locate the template under [P2$[|IM
* the Source Creation and Management node. Right-click the template and choose `CW8Wj
* Open. You can then make changes to the template in the Source Editor. [AQ6ads)
*/ ;rpjXP
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package com.tot.count; sM({u/
import tot.db.DBUtils; $<2r;'?0D
import java.sql.*; fi+u!Y*3Z
/** QRXsLdf$$
* vrdlI^
* @author *. l,_68
*/ 6GG&mqr+
public class CountControl{ A D=@
private static long lastExecuteTime=0;//上次更新时间 Wm4@+}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 T5NO}bz
/** Creates a new instance of CountThread */ g5R2a7
public CountControl() {} ~WU _u,:
public synchronized void executeUpdate(){ n>jb<uz
Connection conn=null; kVw5z3]Xg
PreparedStatement ps=null; qyv9]Q1
try{ O^|dc=
conn = DBUtils.getConnection(); -0PT(gx
conn.setAutoCommit(false); d7qY(!&
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); B#AAG*Ai8
for(int i=0;i<CountCache.list.size();i++){ uQWJ7Xm
CountBean cb=(CountBean)CountCache.list.getFirst(); ZO{uG(u
CountCache.list.removeFirst(); EP&