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: \@i4im@%xU
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CountBean.java woCFkO;'O
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/* k+FiW3-
* CountData.java *yxn*B_xZ
*
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* Created on 2007年1月1日, 下午4:44 El)WjcmH
* G*lkVQ6?
* To change this template, choose Tools | Options and locate the template under SYsbe 5j
* the Source Creation and Management node. Right-click the template and choose !Cv:,q
* Open. You can then make changes to the template in the Source Editor. I>L@P`d
*/ Lw!Q*3c
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package com.tot.count; RY]Vo8
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/** 9:tn!<^=I
* #fR~7K R
* @author XY1eeB-
*/ nm597WeZp
public class CountBean { 8hx 3pvmk
private String countType; Rg?m$$X`
int countId; ~9KxvQzt
/** Creates a new instance of CountData */ 1-M\K^F
public CountBean() {} \P` mV9P
public void setCountType(String countTypes){ PRE\2lLY
this.countType=countTypes; (]l}QR%Bxu
} 6#rj3^]
public void setCountId(int countIds){ j >wT-s
this.countId=countIds; `K^j:fE7n
} 8P#jC$<
public String getCountType(){ DNN60NX 5Q
return countType; ?g21U97Q
} Y$SwQ;wl
public int getCountId(){ Z-D4~?Tv
return countId; _;1H2o2f
} C_JDQByfL
} O$Z<R:vVA
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CountCache.java M(_1'2
}.j09[<
/* RC| t-(Z
* CountCache.java ZdP2}w
* -Ob89Z?2A
* Created on 2007年1月1日, 下午5:01 h7h[!>
* yj48GQP]
* To change this template, choose Tools | Options and locate the template under )ZA3m_w]
* the Source Creation and Management node. Right-click the template and choose >(aGk{e1
* Open. You can then make changes to the template in the Source Editor. jg_##Oha
*/
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package com.tot.count; Bco_\cpt]z
import java.util.*; &>.
w*
/** (IY=x{b
* gADEjr*H
* @author 5|E_ ,d!v
*/ c5t],P
public class CountCache { >pV|c\
public static LinkedList list=new LinkedList(); `zJTVi4
/** Creates a new instance of CountCache */ >sL"HyY#H
public CountCache() {} `V1D&}H+G
public static void add(CountBean cb){ 'kz[Gh*8
if(cb!=null){ V!Q1o!J
list.add(cb); UvtSNP&/2d
} 9Xv>FVG!
} 8"\g?/
} C/w!Y)nB=
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CountControl.java $O/@bh1@p
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/* 7Q(5Nlfcz
* CountThread.java
7Q>*]
* )Bq~1M 2
* Created on 2007年1月1日, 下午4:57 smM*HDK
* C)r!;u)AZH
* To change this template, choose Tools | Options and locate the template under D/$$"AT
* the Source Creation and Management node. Right-click the template and choose f.4m6"1
* Open. You can then make changes to the template in the Source Editor. HJn
*/ >%~%O`+
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package com.tot.count; `]{/(pIgW;
import tot.db.DBUtils; !\0UEC
import java.sql.*; nM)q;9-ni
/** HktvUJ(Ii
* -|l^- Qf!
* @author Q[+o\{ O
*/ x-:a5Kz!
public class CountControl{ `zjEs8`'
private static long lastExecuteTime=0;//上次更新时间 Q9`}dYf.
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]y:ez8RFPU
/** Creates a new instance of CountThread */ q~^qf
public CountControl() {} nbpGxUF`]
public synchronized void executeUpdate(){ h7( R/R f
Connection conn=null; p)$DpNL% p
PreparedStatement ps=null; ZPT6
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try{ Kug_0+gI
conn = DBUtils.getConnection(); 86s.qPB0
conn.setAutoCommit(false); CCp8,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); #N=!O/Y
for(int i=0;i<CountCache.list.size();i++){ /idQfff
CountBean cb=(CountBean)CountCache.list.getFirst(); q@i,$R
CountCache.list.removeFirst(); [HKTXF{n
ps.setInt(1, cb.getCountId()); z4snH%q
ps.executeUpdate();⑴ |g3a1El
//ps.addBatch();⑵ >&|C
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} _7AR2
//int [] counts = ps.executeBatch();⑶ BnLM ;5
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conn.commit(); ?(&)p~o
}catch(Exception e){ /5ngPHy&
e.printStackTrace(); 36<PI'l#~
} finally{ C>d_a;pX
try{ z8SrZ#mg
if(ps!=null) { /mb?C/ CI
ps.clearParameters(); ;$Eg4uX
ps.close(); @w)Vt$+b]
ps=null; <_S>- ;by
} 0i[,`>-Av
}catch(SQLException e){} /e^q>>z
DBUtils.closeConnection(conn); XNwZSW
} .kl _F7
} ]*8K4n G
public long getLast(){ .Y8z3O
return lastExecuteTime; cax]lO
} Ylc[ghx
public void run(){ )F\tU
long now = System.currentTimeMillis(); bp06xHMu
if ((now - lastExecuteTime) > executeSep) { ohFUy}y
//System.out.print("lastExecuteTime:"+lastExecuteTime); -I$qe Xy
//System.out.print(" now:"+now+"\n"); 6gLk?^.
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); t,mD{ENm&
lastExecuteTime=now; (RP"VEVR
executeUpdate(); B?qLXRv
} $YM>HZe-
else{ Pa.D+
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); OC$Y8Ofr
} pg\Ylk"T
} Q3t9J"=1g
} ZSKSMI%D
//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 0-ISOA&
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类写好了,下面是在JSP中如下调用。 y#'|=0vTvP
V^a]@GK:
<% LV4]YC
CountBean cb=new CountBean(); }1A Brbc
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @S /jVXA
CountCache.add(cb); ; ]*
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out.print(CountCache.list.size()+"<br>"); H\OV7=8
CountControl c=new CountControl(); SH"e x,=
c.run(); gK {-eS
out.print(CountCache.list.size()+"<br>"); ^f:oKKaAW;
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