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: 4a?r` '
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CountBean.java EzUPah
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/* 9':/Sab:7v
* CountData.java oAaf)?8
* ^9s"FdB]24
* Created on 2007年1月1日, 下午4:44 ~Zu}M>-^c,
* ;&q]X]bJ
* To change this template, choose Tools | Options and locate the template under Ym`1<2mq\
* the Source Creation and Management node. Right-click the template and choose W}?s^
* Open. You can then make changes to the template in the Source Editor. 2$3kKY6$e
*/ ]Cr]Pvab{
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package com.tot.count; /xJY7yF
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/** Q<C@KBiVE
* VT
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* @author 9GaL0OWo
*/ {n6\g]p3
public class CountBean { j37:
private String countType; p8_2y~!
int countId; juXC?2c
/** Creates a new instance of CountData */ |w4(rs-
public CountBean() {} ,;c{9H
public void setCountType(String countTypes){ 4[Z1r~t\L
this.countType=countTypes; QY@nE
} m qpd
public void setCountId(int countIds){ ?N(u4atC
this.countId=countIds; y6\ [1nZ
} "`[ $&:~
public String getCountType(){ kv/(rKLp*
return countType; s
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} EtJD'&
public int getCountId(){ \ x:_*`fU
return countId; V54q"kP,@.
} D)h["z|F
} u^!&{ q
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CountCache.java 8.PXTOhVL
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/* 'aNahzb
* CountCache.java `I@)<d
* MwN1]d|6
* Created on 2007年1月1日, 下午5:01 RsR] T]4
* ocq2
* To change this template, choose Tools | Options and locate the template under P"2Q&M_/
* the Source Creation and Management node. Right-click the template and choose \l>qY(gu
* Open. You can then make changes to the template in the Source Editor. Vvx a.B
*/ ZWov_
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package com.tot.count; 2lX[hFa5
import java.util.*; 4RlnnXY
/** vR<fdV
* wVlSjk
* @author nl.~^CP
*/ 0c%@e2(N
public class CountCache { *;>V2!N=U
public static LinkedList list=new LinkedList(); u XaL
/** Creates a new instance of CountCache */ O_qu;Dx!
public CountCache() {} u Eu6f
public static void add(CountBean cb){ YK(XS"Kl
if(cb!=null){ QJ[(Y@ O6a
list.add(cb); tU8g(ep,o
} *2w_oKE'+5
} aOaF&6'j
} #nxER
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CountControl.java e);bF>.~
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/* >OF:"_fh
* CountThread.java ?6_"nT*}
* -wPuml!hZ|
* Created on 2007年1月1日, 下午4:57 #
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* b'1/cY/!
* To change this template, choose Tools | Options and locate the template under *[XN.sb8E
* the Source Creation and Management node. Right-click the template and choose i{%z
* Open. You can then make changes to the template in the Source Editor. BH.:_Qrbh[
*/ >$#*`6R
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package com.tot.count; :)^#
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import tot.db.DBUtils; V{ 4i$'
import java.sql.*; Eg287B
/** + MOe{:/6
* CuV=C
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* @author
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*/ 4OqE.LFu
public class CountControl{ jSUAU}u!M
private static long lastExecuteTime=0;//上次更新时间 nr<}Hc^f-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Bd N{[2
/** Creates a new instance of CountThread */ e+d6R[`M
public CountControl() {} dQWA"6?i
public synchronized void executeUpdate(){ %^Q@*+{:f
Connection conn=null; ;XKo44%
PreparedStatement ps=null; pqGf@24c<
try{ ;T"m[D
conn = DBUtils.getConnection(); )-TeDIfm
conn.setAutoCommit(false); 3 cV+A]i
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); #XYLVee,
for(int i=0;i<CountCache.list.size();i++){ gMoyy
CountBean cb=(CountBean)CountCache.list.getFirst(); 'Wx\"]:
CountCache.list.removeFirst(); 5VoOJ_hq
ps.setInt(1, cb.getCountId()); (e bBH
ps.executeUpdate();⑴ FrAqTz
//ps.addBatch();⑵ .MzP}8^
} #%}u8\q
//int [] counts = ps.executeBatch();⑶ 0NuL9
conn.commit(); HNkZ1+P {
}catch(Exception e){ b_K?ocq
e.printStackTrace(); 47(1V/r
} finally{ Le#E! sU
try{ 5~kW-x
if(ps!=null) { jl 30\M7
ps.clearParameters(); vo}_%5v8
ps.close(); RT_Pd\(qD
ps=null; %0y3 /W
} c9cphZ(z
}catch(SQLException e){} YWn6wzu%Vc
DBUtils.closeConnection(conn); c?V*X-
} !lt\2Ae
} j4
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public long getLast(){ #P,[fgNy
return lastExecuteTime; zDGg\cPj9
} ]B-$p p
public void run(){ 1>*UbV<R;u
long now = System.currentTimeMillis(); bTo@gJkn
if ((now - lastExecuteTime) > executeSep) { 71n uTE%!
//System.out.print("lastExecuteTime:"+lastExecuteTime); G,mH!lSm,
//System.out.print(" now:"+now+"\n"); *nUpO]
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); +(h6{e%)
lastExecuteTime=now; Kj1#R
executeUpdate(); <*6y`X
} ;]#4p8lh+
else{ p#8LQP~0$
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); PE6u8ZAb"
} Ow .)h(y/
} ?/|@ #&
} lj SR?:\
//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 ^6NABXL
@,>=X:7
类写好了,下面是在JSP中如下调用。 T~ q'y~9o
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<% HV.|Eh_7
CountBean cb=new CountBean(); m 'H
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); !k??Kj
CountCache.add(cb); d`q)^
out.print(CountCache.list.size()+"<br>"); !=Kay^J~.
CountControl c=new CountControl(); )}9}"jrDlx
c.run(); {msB+n~WZ
out.print(CountCache.list.size()+"<br>"); "a`0w9Mm}
%>