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: C`>|D [
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CountBean.java Dt p\T|)
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/* I%fz^:[#<
* CountData.java SUQk0 (M
* |XdkJv]
* Created on 2007年1月1日, 下午4:44 nkvkHh
* Z )f\^
* To change this template, choose Tools | Options and locate the template under m?=9j~F*
* the Source Creation and Management node. Right-click the template and choose |6}:n,KA.
* Open. You can then make changes to the template in the Source Editor. k4ijWo{:0
*/ Q-LDFnOFwp
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package com.tot.count; 47 _";g@X
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/** MGzuQrl{H
* M&5;Qeoiv
* @author Z>#MTxU(
*/ P6cc8x9g(
public class CountBean { "Lp"o
private String countType; )FfJ%oT}
int countId; yIdM2#`u
/** Creates a new instance of CountData */ ?NL>xMA
public CountBean() {} 8 O5@FU
3
public void setCountType(String countTypes){ N<54_(|X
this.countType=countTypes; 0Tm"Zh?B|
} ]%K 8
public void setCountId(int countIds){ =5-|H;da
this.countId=countIds; oqOXRUy
} m%hUvG| i
public String getCountType(){ %hu] =
return countType; 2-3|0<`
} 'h6Vj6
public int getCountId(){ #!%\97ZR
return countId; !y>MchNv
} O!(FNv0
} |$vhu`]Z@^
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CountCache.java EQ j2:9f
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/* jaj."v
* CountCache.java ^'|\8
* 2_ x~y|<9
* Created on 2007年1月1日, 下午5:01 3??*G8Yp
* N2"4dVV;
* To change this template, choose Tools | Options and locate the template under cXO_g!&2A
* the Source Creation and Management node. Right-click the template and choose a%-P^M;a2
* Open. You can then make changes to the template in the Source Editor. Xj\SJ*
*/ C<.t'|
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package com.tot.count; .g7ebh6D
import java.util.*; E6-alBi%
/** 5O9Oi:-!c
* a/.O,&3
* @author "/).:9],}
*/ <mc[-To
public class CountCache { -4p^wNR
public static LinkedList list=new LinkedList(); b|c?xHF}K
/** Creates a new instance of CountCache */
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public CountCache() {} K/ q:aMq
public static void add(CountBean cb){ XV2f|8d>
if(cb!=null){ `A\
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list.add(cb); >9f-zv(n
} %aX<p{EY
} n_@YKz;8
} '|e5 cW6z
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CountControl.java {PHxm
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/* p&F=<<C
* CountThread.java /q%TjQ}F
* .E_`*[ 5=
* Created on 2007年1月1日, 下午4:57 K<b -|t9f
* nTSGcMI
* To change this template, choose Tools | Options and locate the template under bQk5R._got
* the Source Creation and Management node. Right-click the template and choose r4O*0Q_
* Open. You can then make changes to the template in the Source Editor. ?-O(EY1E
*/ ^/HE_keY
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package com.tot.count; EX8:B.z`57
import tot.db.DBUtils; C,Je >G
import java.sql.*; 0Bn$C,-
/** YTq>K/
* =,I,K=+_x
* @author &l%#OI}OE
*/ &hs)}uM&$
public class CountControl{ K/Axojo
private static long lastExecuteTime=0;//上次更新时间 8k+Ctk
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 xYM!mcA
/** Creates a new instance of CountThread */ u=#!je
public CountControl() {} P/t$xqAL
public synchronized void executeUpdate(){ SsafRK$
Connection conn=null; XaD}J:X q
PreparedStatement ps=null; [HIg\N$I8C
try{ K^H=E
conn = DBUtils.getConnection(); ~@R=]l"
conn.setAutoCommit(false); sl%B-;@I
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); uZ Id.+Rk
for(int i=0;i<CountCache.list.size();i++){ $|z8WCJ
CountBean cb=(CountBean)CountCache.list.getFirst(); +YhTb
CountCache.list.removeFirst(); vK#xA+W
ps.setInt(1, cb.getCountId()); vC\]7]mC
ps.executeUpdate();⑴ Z/hSH
0 (~
//ps.addBatch();⑵ \I#2Mq?
} 5nqj
//int [] counts = ps.executeBatch();⑶ [F+lVb
conn.commit(); qVJV 9n
}catch(Exception e){ $9*Xfb/
e.printStackTrace(); K*;=^PY
} finally{ Qo)>i0
try{ *;+lF
if(ps!=null) { jbC7U9t7
ps.clearParameters(); )F]E[sga
ps.close(); |??uVA)\X
ps=null; }RDhI1x[mk
} Tp[ub(/;7
}catch(SQLException e){} #i.M-6SRd
DBUtils.closeConnection(conn); ^N`ar9Db
} C/_W>H_
} FL0(q>$*8
public long getLast(){ uGc}^a2
return lastExecuteTime; K-k;`s#
} z9&$Xao
public void run(){ 0l^-[jK)
long now = System.currentTimeMillis(); gjvKrg
if ((now - lastExecuteTime) > executeSep) { #\@*C=
//System.out.print("lastExecuteTime:"+lastExecuteTime); e}kEh+4
//System.out.print(" now:"+now+"\n"); ph%/;?wY
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); _hA p@?
M
lastExecuteTime=now; vy1:>N?#5
executeUpdate(); GvF~h0wMt
} J03yFT,dF
else{ ga6M8eOI
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); yYp!s
} MPT*[&\-
} #G$_\bt
} C:l
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//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 hqD]^P>l1
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类写好了,下面是在JSP中如下调用。 b)3dZ*cOJ
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<% =d.Z:L9d
CountBean cb=new CountBean(); { >bw:^F
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); FJp~8
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CountCache.add(cb); d*3k]Ie%5f
out.print(CountCache.list.size()+"<br>"); 3iR;(l}
CountControl c=new CountControl(); \;.\g6zX
c.run(); +P6q
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out.print(CountCache.list.size()+"<br>"); yWsNG;>
%>