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: =wU08}
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CountBean.java O>|Q Zd
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/* $C(}
* CountData.java W?F+QmD
* N\HOo-X
* Created on 2007年1月1日, 下午4:44 |53Zg"!
* bNY_V;7Kw`
* To change this template, choose Tools | Options and locate the template under IR(JBB|xNQ
* the Source Creation and Management node. Right-click the template and choose l5D8DvJCj
* Open. You can then make changes to the template in the Source Editor. =|pQA~UU#
*/ DDc?GY:
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package com.tot.count; yXR$MT+ ~
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/** =4m?RPb~b
* VoWlBH
* @author k1_f7_m
*/ sR+=<u1
public class CountBean { 29 Yg>R!/
private String countType; p_)V@7
int countId; :JxShF:M
/** Creates a new instance of CountData */ M{3He)&
public CountBean() {} !d&K,k
public void setCountType(String countTypes){ +/-#yfn!TR
this.countType=countTypes; x =5k74
} o[O-|XL_
public void setCountId(int countIds){ m/Q@ -
this.countId=countIds; #
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} }tua0{N:z
public String getCountType(){ r|{h7'
return countType; 1<\@i{;xsU
} Siq2Glg_
public int getCountId(){ tl
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return countId; @F+4
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} Ky8sLm@
} K;sH0*
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CountCache.java bT|a]b:
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/* ZXY5Xvt:v
* CountCache.java cWA9 n}Z
* w9SPkPkYE
* Created on 2007年1月1日, 下午5:01 I_6?Q^_uZ
* F@& R"-
* To change this template, choose Tools | Options and locate the template under hJ (Q^Z
* the Source Creation and Management node. Right-click the template and choose [}9sq+##
* Open. You can then make changes to the template in the Source Editor. C5CUMYU
*/ JN .\{ Y
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package com.tot.count; rr>QG<i;G
import java.util.*; &na#ES$X,
/** w4Qqo(
* pEuZsQ
* @author ms{:=L2$$
*/ zH0%;
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public class CountCache { XI}
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public static LinkedList list=new LinkedList(); Z3g6?2w6
/** Creates a new instance of CountCache */ 2?u>A3^R
public CountCache() {} o]t6u .L
public static void add(CountBean cb){ w},' 1
if(cb!=null){ OL4I}^*,
list.add(cb); I= G%r/3
} ng0IRJ:3
} QM\vruTB
} %<lfe<;^t
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CountControl.java kTb.I;S
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/* ZF"f.aV8)
* CountThread.java !rZO~a0
* M$DJ$G|Z
* Created on 2007年1月1日, 下午4:57 rlT[tOVAY
* XKp.]c wP
* To change this template, choose Tools | Options and locate the template under *:J#[ET,
* the Source Creation and Management node. Right-click the template and choose =2] .G Gg
* Open. You can then make changes to the template in the Source Editor. kMWu%,s4
*/ M[}EVt~
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package com.tot.count; Fh9%5-t:J
import tot.db.DBUtils; :@jhe8'w
import java.sql.*; j/4N
/** >y m MQEX`
* /e1m1 B
* @author `au('
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*/ @'C f<wns
public class CountControl{ ;
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private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Genk YtS
/** Creates a new instance of CountThread */ iDt^4=`
public CountControl() {} A`v (hBM
public synchronized void executeUpdate(){ #P.jlpZk
Connection conn=null; gYVk5d|8@4
PreparedStatement ps=null; CB<1]Z
try{ W6ZXb_X
conn = DBUtils.getConnection(); #qXE[%
conn.setAutoCommit(false); }M'h5x
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); @P#uH5U
for(int i=0;i<CountCache.list.size();i++){ 'bGL@H
CountBean cb=(CountBean)CountCache.list.getFirst(); 0* <gGC
CountCache.list.removeFirst(); ^'.=&@i-
ps.setInt(1, cb.getCountId()); CnruaN@
ps.executeUpdate();⑴ n)uvN
//ps.addBatch();⑵ 3p{N7/z(
} :_JZn`Cab
//int [] counts = ps.executeBatch();⑶ x^Tjs<#
conn.commit(); ?z% @;&
}catch(Exception e){ CZRrb 84
e.printStackTrace(); ot]eaad
} finally{ wNL!T6"G
try{ 0Ge*\Q
if(ps!=null) { :bI4HXT3
ps.clearParameters(); yaD<jc(O
ps.close(); Os^ sOOSY
ps=null; 9)0AwLlv
} A!Zjcp|
}catch(SQLException e){} ATCFdtNc
DBUtils.closeConnection(conn); | qtdmm
} Yh_H$uW
} 4*MjDb
public long getLast(){ D5fJuT-bp
return lastExecuteTime; Uo v%12
} P7QOlTQI
public void run(){ >JwdVy^
long now = System.currentTimeMillis(); v1<gNb)`
if ((now - lastExecuteTime) > executeSep) { +jYO?uaT
//System.out.print("lastExecuteTime:"+lastExecuteTime); W)JUMW2|
//System.out.print(" now:"+now+"\n"); O%5cMz?eU
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); y[[f?rxz>
lastExecuteTime=now; H
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executeUpdate(); ;'l Hw]}O*
} -cs
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else{ D}'g4Ag
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); *I%r
} rt$zM
} pq_DYG]
} ~K% ]9
//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 $l-|abLELz
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类写好了,下面是在JSP中如下调用。 P`6
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<% i@e.Uzn
CountBean cb=new CountBean(); /*p4(D_A
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); d,[.=Jqv[
CountCache.add(cb); ^-{ 1]G:
out.print(CountCache.list.size()+"<br>"); hPr*<2mp
CountControl c=new CountControl(); Sxf|gDC
c.run(); !e@G[%k
out.print(CountCache.list.size()+"<br>"); rubqk4
%>