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: }el.qZ
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CountBean.java wA+J49
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/* R<Ojaj=V
* CountData.java H;k;%Zg;
* QN9$n%Z
* Created on 2007年1月1日, 下午4:44 l:a+o gm3
* miCt)Qd
* To change this template, choose Tools | Options and locate the template under 0J_ AX
* the Source Creation and Management node. Right-click the template and choose 5znLpBX<N
* Open. You can then make changes to the template in the Source Editor. }e6Ta_Z~
*/ n <6}
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package com.tot.count; ilw<Q-o4(
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/** =%znY`0b56
* TgSU}Mf)a
* @author Ox8dnPcx
*/ B~cq T/\?
public class CountBean { p.n]y=o.)
private String countType; F:%= u
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int countId; j2cLb
/** Creates a new instance of CountData */ <P'^olQ
public CountBean() {} df
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public void setCountType(String countTypes){ hqnJ@N$yY
this.countType=countTypes; &32qv`
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} ;DL|%-%;$r
public void setCountId(int countIds){ /R^HRzTO
this.countId=countIds; !
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} fGcAkEstT!
public String getCountType(){ d@b 0z$<s
return countType; tE]g*]o
} ,ZJI]Q=!
public int getCountId(){ COOazXtW
return countId; VCiJ]$`M
} zid?yuP
} #E2`KGCzW
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CountCache.java KunK.m
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/* 4\pi<#X
* CountCache.java *ys@'Ai?
* 5>t&)g
* Created on 2007年1月1日, 下午5:01 Tg&{P{$
* B cX}[?c
* To change this template, choose Tools | Options and locate the template under 2}'qu)
* the Source Creation and Management node. Right-click the template and choose qDqIy+WR
* Open. You can then make changes to the template in the Source Editor. b+'G^!JR
*/ &vj+3<2
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package com.tot.count; =w?-R\
import java.util.*; qRJg/~_h{
/** "z69jxXo
* Q`7!~qV0=
* @author '/\@Mc4T
*/ FZ #ngrT
public class CountCache { WVftLIJ
public static LinkedList list=new LinkedList(); r[eZV"
/** Creates a new instance of CountCache */ k*-_CO-h
public CountCache() {} D=mU!rjr1
public static void add(CountBean cb){ Lbq"( b
if(cb!=null){ _0)#-L>xKF
list.add(cb); X9/V;!
} C(3yJzg>y
} i`gsT[JQRX
} P~#!-9?
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CountControl.java :t(gD8 ;
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/* C:hfI;*7
* CountThread.java >L$y|8O
* s^^X.z ,
* Created on 2007年1月1日, 下午4:57 5w gtc~
* Q# }} 1}Ja
* To change this template, choose Tools | Options and locate the template under (i|`PA
* the Source Creation and Management node. Right-click the template and choose -vGyEd7
* Open. You can then make changes to the template in the Source Editor. +AZ=nMgW
*/ ,M>W) TSH
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package com.tot.count; 3rZFN^
import tot.db.DBUtils; Fw+JhIVP
import java.sql.*; hAOXOj1
/** V(L~t=k$
* NSOWn]E
* @author KA`1IW;
*/ dY~3YD[
public class CountControl{ UX41/# 4
private static long lastExecuteTime=0;//上次更新时间 .Y&_k
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 7WiVor$g-
/** Creates a new instance of CountThread */ 6](vnS;
public CountControl() {} RoxzCFsI\
public synchronized void executeUpdate(){ 3hmuF6y~
Connection conn=null; q+~z# jFX
PreparedStatement ps=null; +LQ2To
try{ #"O9\X/B
conn = DBUtils.getConnection(); O!d^v9hM,
conn.setAutoCommit(false); x-nwo:OA
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 9'3bzhT$
for(int i=0;i<CountCache.list.size();i++){ +DF<o
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CountBean cb=(CountBean)CountCache.list.getFirst(); `tVBV:4\
CountCache.list.removeFirst(); 7V 4iPx
ps.setInt(1, cb.getCountId()); a,d\<mx
ps.executeUpdate();⑴ Ki^m&P
//ps.addBatch();⑵ wC{=o`v
} ~"gOq"y5p
//int [] counts = ps.executeBatch();⑶ 7Hf6$2Wh
conn.commit(); Sj+gf~~
}catch(Exception e){ yZb@
e.printStackTrace(); RL~\/#
} finally{ XZV)4=5iSO
try{ dDi 1{s
if(ps!=null) { PP. k>zsx
ps.clearParameters(); '$
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ps.close(); (dpBGt@
ps=null; (+Gd)iO
} N?kXATB
}catch(SQLException e){} E-X-LR{CC
DBUtils.closeConnection(conn); 18}L89S>
} bsr
} (^qcX;-
public long getLast(){ *7ap[YXZ\w
return lastExecuteTime; 8ji!FZf
} ,G"?fQ7z R
public void run(){ m]Z+u e
long now = System.currentTimeMillis(); &'WgBjP
if ((now - lastExecuteTime) > executeSep) { *B#OLx
//System.out.print("lastExecuteTime:"+lastExecuteTime); E"#<I*b
//System.out.print(" now:"+now+"\n"); =WyAOgy}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (-B0fqh=G
lastExecuteTime=now; cC"7Vt9b
executeUpdate(); 'V4.umj1~
} VEpIAC4
else{ &4O"Xs`ka
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); OMJr.u
} ]
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} )09_CC!a
} ksu:RJ-
//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 /iy2j8:z
/J/r 62
类写好了,下面是在JSP中如下调用。 HZ[&ZNTa
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<% @*is]d+Ya
CountBean cb=new CountBean(); 8Ral%I:gr
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ;f?OT7>kN
CountCache.add(cb); d^ipf*aLC
out.print(CountCache.list.size()+"<br>"); A
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CountControl c=new CountControl(); OTN"XKa$
c.run(); U=Z@Ipu5T
out.print(CountCache.list.size()+"<br>"); %04>R'mN
%>