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: f|VP_o<
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CountBean.java 6x@-<{L
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/* cf@#a@7m9
* CountData.java qRB7I:m-Wi
* vfhip"1
* Created on 2007年1月1日, 下午4:44 B0Z~L){i
* V!KtF
* To change this template, choose Tools | Options and locate the template under y&__2t^u
* the Source Creation and Management node. Right-click the template and choose TF^]^XS'
* Open. You can then make changes to the template in the Source Editor. 3iWLo Qm
*/ c_^H;~^rL
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package com.tot.count; 7<.f&1MgI
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/** dl{3fldb
* Mdwh-Cis/
* @author !s)2H/KM 8
*/ $]81 s`
public class CountBean { Q)a*bPz
private String countType; *pasI.2s#
int countId; iCx'`^HnP
/** Creates a new instance of CountData */ f\(K ou$
public CountBean() {} TU. h
public void setCountType(String countTypes){ 3!$rp- !<)
this.countType=countTypes; 5WZLB =
} 103Ik6.o
public void setCountId(int countIds){ _X.M,id
this.countId=countIds; [=E<iPl
} .Yu,&HR
public String getCountType(){ */8\Z46z
return countType; 50H [u|
} mI`dZ3h
public int getCountId(){ FySK&
return countId; rfPJBD{Ve
} L7xTAFe
} x`eYC i
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CountCache.java g*]<]%Py"
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/* /r?X33D!
* CountCache.java E{Q^ZSV3B
* R\+$^G}#6
* Created on 2007年1月1日, 下午5:01 q{_buTARq
* lp]O8^][&
* To change this template, choose Tools | Options and locate the template under H+0 *
* the Source Creation and Management node. Right-click the template and choose A qm0|GlJ
* Open. You can then make changes to the template in the Source Editor. a,tP.Xsl
*/ j/Kw-h ,5"
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package com.tot.count; uuC/F_='B
import java.util.*; {jq-dL
/** n+i}>3'A
* H5aUZ=
* @author ?QMs<
*/ A=3U4L
public class CountCache { @LmUCP~
public static LinkedList list=new LinkedList(); QTyl=z7
/** Creates a new instance of CountCache */
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public CountCache() {} #e0+;kBh
public static void add(CountBean cb){ jf2E{48P
if(cb!=null){ (HJ60Hj
list.add(cb); Yp;x
} Sn+Yi
} 7vWB=r>5@
} ~gAx
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CountControl.java [p(C:rH
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/* bBQp:P?E
* CountThread.java w5nRgdboy!
* +*!!
* Created on 2007年1月1日, 下午4:57 RcE%?2lD
* fGfv{4R
* To change this template, choose Tools | Options and locate the template under ~>EVI=?
* the Source Creation and Management node. Right-click the template and choose Av[jFk
* Open. You can then make changes to the template in the Source Editor. C^~iz
in
*/ ':[y]ep(~|
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package com.tot.count; k{#:O=
import tot.db.DBUtils; bC{~/ JP
import java.sql.*; ?:2Xh/8-
/** cP
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* v;A
* @author f;Dz(~hw
*/ ["7}u^z@<+
public class CountControl{ <*\J 6:^n
private static long lastExecuteTime=0;//上次更新时间 _\<M58/z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +l#2u#e
/** Creates a new instance of CountThread */ &V;a:
public CountControl() {} .6hH}BM
public synchronized void executeUpdate(){ B?4\IXek
Connection conn=null; 8BN'fWl&E
PreparedStatement ps=null; Nf~<xK
try{ -Z@p
conn = DBUtils.getConnection(); O| 2Q-
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conn.setAutoCommit(false); r5"/EMieh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); E0|aI4S4
for(int i=0;i<CountCache.list.size();i++){ 83n: h08
CountBean cb=(CountBean)CountCache.list.getFirst(); N$+"zJmw&