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: zu,F 0;De
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CountBean.java y6hb-:
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/* f-!P[6bY
* CountData.java f} !Eu
* Z!& u_
* Created on 2007年1月1日, 下午4:44 >1$vG
* fi,h`mdT?
* To change this template, choose Tools | Options and locate the template under tl=H9w&@
* the Source Creation and Management node. Right-click the template and choose 9cnLf#
* Open. You can then make changes to the template in the Source Editor. svaclkT=
*/ ^H(,^cVN
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package com.tot.count; tKX+eA]
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/** 3J_BuMV
* uxOeD%Z>
* @author .N>Th/K8
*/ d7]~t|
public class CountBean { ln2lFfz
private String countType; ?'IY0^
int countId; -z~;f<+I`
/** Creates a new instance of CountData */ pQNTN.L9NZ
public CountBean() {} #]kO/Mr
public void setCountType(String countTypes){ ZnAXb S
this.countType=countTypes; KCl85Wi'
} rizWaw5E!8
public void setCountId(int countIds){ MJ M<
this.countId=countIds; *TgD{>s
} A4daIhP
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public String getCountType(){ aP[oLk$'Z
return countType; [.'9Sw
} [tk6Kx8a
public int getCountId(){ g`(3r
return countId; )?{jD
} =`ECM7
} E1D0un
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CountCache.java b8LA|#]i
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/* 8l*h\p:Q
* CountCache.java oTg
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* 1G8,Eah
* Created on 2007年1月1日, 下午5:01 l?B=5*0
* abw5Gz@Ag
* To change this template, choose Tools | Options and locate the template under v Q51-.g
* the Source Creation and Management node. Right-click the template and choose #A&49a3^1
* Open. You can then make changes to the template in the Source Editor. CrB4%W:{
*/ ?&-$Zog
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package com.tot.count; 'fYF1gR4
import java.util.*; dVSQG947i:
/** iu.Jp92
* "fC>]iA8I
* @author trZU_eouI
*/ k8b5~A,
public class CountCache { Gkm{b[
public static LinkedList list=new LinkedList(); {f\{{JJ]
/** Creates a new instance of CountCache */ ji
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public CountCache() {} Fl!D2jnN
public static void add(CountBean cb){ (9{qT>eJg=
if(cb!=null){ eV"s5X[$
list.add(cb); gs&F
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} 1\J9QZX0
} (7ujJ}#,
} Dq-[b+bm
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CountControl.java [X7gP4
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/* NA$%Up
* CountThread.java = |E8z
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* R'pfA
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* Created on 2007年1月1日, 下午4:57 CwD=nT5`
* fw5+eTQ^
* To change this template, choose Tools | Options and locate the template under L2_[M'
* the Source Creation and Management node. Right-click the template and choose e*}:tH
* Open. You can then make changes to the template in the Source Editor. IVy<>xpt
*/ p2< 927z
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package com.tot.count; y4r?M8]"r
import tot.db.DBUtils; V(:wYk?ZR
import java.sql.*; f96`n+>xi
/** vz|(KN[
* .R#-u/6g(
* @author VFMn"bYOB
*/ P#Whh
public class CountControl{ T1R~^x1
private static long lastExecuteTime=0;//上次更新时间 )wXE\$
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 c`&g.s@N\
/** Creates a new instance of CountThread */ cNN0-<#c
public CountControl() {} hS*&p0YV~M
public synchronized void executeUpdate(){ R*D5n>~
Connection conn=null; cK2;)&U7
PreparedStatement ps=null; Jw#7b[a
try{ 4q:8<*W=
conn = DBUtils.getConnection(); !
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conn.setAutoCommit(false); FFcIOn
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )_OGt [_H
for(int i=0;i<CountCache.list.size();i++){ N-t"CBTO
CountBean cb=(CountBean)CountCache.list.getFirst(); dA E85
CountCache.list.removeFirst(); _sZ&=-FR
ps.setInt(1, cb.getCountId()); x %9Ca)r?}
ps.executeUpdate();⑴ /I1n${{5
//ps.addBatch();⑵ cNFHbMd
} ,G-
//int [] counts = ps.executeBatch();⑶ mlLqQ<
conn.commit(); b|@zjh;]A7
}catch(Exception e){ /d">}%Jn
e.printStackTrace(); (C1~>7L
} finally{ ~7PiIky.
try{ l'M/et{:
if(ps!=null) { M X?UmQ'
ps.clearParameters(); A.@wGy4
ps.close(); lkly2|wA
ps=null; -ah)/5j
} h oM%|,0
}catch(SQLException e){} 1RX-`"^+
DBUtils.closeConnection(conn); 9<i M2(IW{
} tQYV4h\Qj
} `s Im&.d
public long getLast(){ W(Md0*
return lastExecuteTime; 6rWq
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} CB,2BTtRE
public void run(){ #Ef! X
long now = System.currentTimeMillis(); Q4*{+$A
if ((now - lastExecuteTime) > executeSep) { =R 4]Kf
//System.out.print("lastExecuteTime:"+lastExecuteTime); kOdpW
//System.out.print(" now:"+now+"\n"); GA`
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lZe-A/E
lastExecuteTime=now; bA2[=6
executeUpdate(); ?b'(39fj
} BNA1"@9q
else{ @8w5Oudvx
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ~`^kP.()
} $cuBd
} :?= 1aiS
} N?#L{Yt
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 T][c^K*
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类写好了,下面是在JSP中如下调用。 ,'t&L]
l-20X{$m:
<% xluAjOQ6
CountBean cb=new CountBean(); 7QZyd-
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \fSruhD
CountCache.add(cb); PY4a3dp
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out.print(CountCache.list.size()+"<br>"); UM`$aPz
CountControl c=new CountControl(); =h=-&DSA
c.run(); <;>k[P'
out.print(CountCache.list.size()+"<br>"); I7SFGO
%>