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: ec?V[v
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CountBean.java (]XbPW
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/* thptm
* CountData.java GRIa8>
* uY;R8CiD
* Created on 2007年1月1日, 下午4:44 !}5*?k
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* ,1
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* To change this template, choose Tools | Options and locate the template under 5B{k\H;
* the Source Creation and Management node. Right-click the template and choose +T2HE\
* Open. You can then make changes to the template in the Source Editor. Qci$YTwl>
*/ jTfi@5aPY
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package com.tot.count; VgMP^&/gZ
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/** %2D17*eK
* ej52AK7
* @author j o_
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*/ 9afh[3qm
public class CountBean { Me/\z^pF
private String countType; Us-A+)r*!
int countId; Q]rqD83((
/** Creates a new instance of CountData */ [@3SfQ
public CountBean() {} "OL~ul5
public void setCountType(String countTypes){ X>t3|h
this.countType=countTypes; IqUp4}
} Z>2]Xx%
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public void setCountId(int countIds){ HabzCH
this.countId=countIds; XV=S)
} FVgMmYU
public String getCountType(){ 2]2H++
return countType; 8a>SC$8"
} hH`Jb77L
public int getCountId(){ @o#+5P
return countId; $"8d:N?I[
}
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} {155b0
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CountCache.java O@jqdJu
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/* \zu}\{
* CountCache.java <'&F;5F3V
* hS:jBp,
* Created on 2007年1月1日, 下午5:01 +.@c{5J<
* XdsJwn F
* To change this template, choose Tools | Options and locate the template under ((|IS[
* the Source Creation and Management node. Right-click the template and choose #s2B%X
* Open. You can then make changes to the template in the Source Editor. .N"~zOV<#
*/ I4D<WoU;dJ
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package com.tot.count; .X
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import java.util.*; |s=`w8p
/** 5/MED}9C(
* t3b@P4c\
* @author -@M3Dwsi3
*/ 3.vgukkk5
public class CountCache { VVuR+=.&
public static LinkedList list=new LinkedList(); i8~r
/** Creates a new instance of CountCache */ +xj "hX>3
public CountCache() {} -(IC~
public static void add(CountBean cb){ y
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if(cb!=null){ S&?7K-F>_o
list.add(cb); i:Y\`J
} /\E [
} `4
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} !M;A*:-
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CountControl.java IU!Ht>
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/* f=aIXhiYU
* CountThread.java 8_xLl2
* S~3\3qt$
* Created on 2007年1月1日, 下午4:57 ZHkw6@|
* ;&f1vi4
* To change this template, choose Tools | Options and locate the template under ^od<JD4
* the Source Creation and Management node. Right-click the template and choose K]fpGo
* Open. You can then make changes to the template in the Source Editor. SDBt @=Nl
*/ zn)yFnB!TH
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package com.tot.count; Fr5 Xp
import tot.db.DBUtils; 7=k^M, a
import java.sql.*; 2z\;Q8g){r
/** p=gX!4,9<
* S "
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* @author kuKa8c
*/ iiNSDc
public class CountControl{ `.^ |]|u
private static long lastExecuteTime=0;//上次更新时间 u) *Kws
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 WRpyr
/** Creates a new instance of CountThread */ .y): Rh^
public CountControl() {} AK2WN#u@Z
public synchronized void executeUpdate(){ n29(!10Px
Connection conn=null; j*zD0I]
PreparedStatement ps=null; q;A;H)?g
try{ lTz6"/
conn = DBUtils.getConnection(); vV^dm)?
conn.setAutoCommit(false); nPA@h
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ]b}B2F'n
for(int i=0;i<CountCache.list.size();i++){ >eS$
CountBean cb=(CountBean)CountCache.list.getFirst(); }htPTOy5
CountCache.list.removeFirst(); MFwO9"<A
ps.setInt(1, cb.getCountId()); 7SS07$B
ps.executeUpdate();⑴ YD&_^3-XM
//ps.addBatch();⑵ KQmZ#W%2m
} #jS[
//int [] counts = ps.executeBatch();⑶ _H\<[-l
conn.commit(); ebM{OI
}catch(Exception e){ 3?E}t*/
e.printStackTrace(); dGkgaC+
} finally{ &Lt@} 7$8
try{ C2/}d? bki
if(ps!=null) { >Ko[Xb-8^_
ps.clearParameters(); \=nrt?
ps.close(); *jCW.ZLY
ps=null; J(iV0LAZb
} "2hh-L7ql
}catch(SQLException e){} u\g,.C0
DBUtils.closeConnection(conn); LE;g
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} 6 hiC?2b{x
} +>YfRqz:KB
public long getLast(){ vVVPw?Ww-
return lastExecuteTime; bd \=h1
} PC/!9s0W
public void run(){ )Yj%#
long now = System.currentTimeMillis(); EUcKN1
if ((now - lastExecuteTime) > executeSep) { +m/,,+4
//System.out.print("lastExecuteTime:"+lastExecuteTime); Jqfm@Y
//System.out.print(" now:"+now+"\n"); u#jC#u^M
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &u8z5pls8
lastExecuteTime=now; OJ,m1{9$}
executeUpdate(); h?j_Ry
} `X
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else{ I3) Zr+
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !7 _\P7M
} }[n5n
} /[pqI0sf<A
} x$B&L`QV
//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 U^_D|$6
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类写好了,下面是在JSP中如下调用。 hh"-w3+
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<% D}{b;Un
CountBean cb=new CountBean(); CqoG.1jJS
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); G{lcYP O
CountCache.add(cb); &/WAZs$2n
out.print(CountCache.list.size()+"<br>"); _>_j\b
CountControl c=new CountControl(); @ 4UxRp6+
c.run(); %ROwr[Dj=
out.print(CountCache.list.size()+"<br>"); [Z<Z;=t
%>