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: Z2!O)8
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CountBean.java ncjtv"2R
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/* J{`G=
* CountData.java ?@!dc6
* @FU9!
* Created on 2007年1月1日, 下午4:44 ha&2V=
* ~QQi{92
* To change this template, choose Tools | Options and locate the template under /p}^Tpu
* the Source Creation and Management node. Right-click the template and choose kzcl
* Open. You can then make changes to the template in the Source Editor. Z]jm.'@z@
*/ 5R"iF+p4
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package com.tot.count; 2Sz?r d,0f
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/** R9xhO!
* ^`?2g[AA
* @author g
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*/ ~|QhWgq
public class CountBean { P;GRk6
private String countType; ER-X1fD
int countId; 6R1}fdHvP
/** Creates a new instance of CountData */ 1CXO=Q
public CountBean() {} gE;r;#Jt4
public void setCountType(String countTypes){ ^}8qPBz
this.countType=countTypes; #6* j+SX^
} l3[2b
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public void setCountId(int countIds){ U|ZYoc+](
this.countId=countIds; 2SVBuV/R
} 3g
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public String getCountType(){ ,aq0Q<}~lc
return countType; ^/b3_aM5d
} vVBu/)
public int getCountId(){ ^qvN:v$1
return countId; u]RI,3Z
} 8=\}#F
} dX^ ^
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CountCache.java kn9ul3c
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/* - >_rSjnM{
* CountCache.java *ETSx{)8
* ;=r_R!d@
* Created on 2007年1月1日, 下午5:01 {^(h*zxn
* fXD9w1
* To change this template, choose Tools | Options and locate the template under `-yo-59E[
* the Source Creation and Management node. Right-click the template and choose ~$w9L998+
* Open. You can then make changes to the template in the Source Editor. zp.-=)D4e
*/ #O<,
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package com.tot.count; ;xqN#mqq
import java.util.*; N5K\h}'%
/** lFJDdf2:$C
* 'ip2| UG
* @author (+aU ,EQ
*/ !:BmDX[<n
public class CountCache { ?5VPV9EX
public static LinkedList list=new LinkedList(); '/O >#1
/** Creates a new instance of CountCache */ b}<?& @
public CountCache() {} yVZLZLm
public static void add(CountBean cb){ `|=hl~
if(cb!=null){ w&F.LiX^
list.add(cb); I)]"`2w2w
} sQ";
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} Q7#Yw"#G!
} XSOSy2:
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CountControl.java +V
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/* j{&*]QTN
* CountThread.java dQ#$(<v[
* j; TXZ`|(
* Created on 2007年1月1日, 下午4:57 {f1iys'Om
* L*(Sh2=_
* To change this template, choose Tools | Options and locate the template under 4J5 RtK
* the Source Creation and Management node. Right-click the template and choose ?q{HS&k
* Open. You can then make changes to the template in the Source Editor. %H/V
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*/ tXXnHEz
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package com.tot.count; -F7P$/9
import tot.db.DBUtils; $Sls9H+.
import java.sql.*; yor6h@F1
/** 3%~c\naD?O
* 0#y
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* @author &)
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*/ dQljG.PiK
public class CountControl{ m:-=K
private static long lastExecuteTime=0;//上次更新时间 XU5GmGu_+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 AJYZ`
/** Creates a new instance of CountThread */ }t%2giJ
public CountControl() {} 4"^v]&I
public synchronized void executeUpdate(){ }j`#s
Connection conn=null; .QVN&UyZ
PreparedStatement ps=null; 9 `+RmX;m
try{ T;C0t9Yew
conn = DBUtils.getConnection(); 'f_[(o+n
conn.setAutoCommit(false); 8{4SaT.-Rm
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ,II-:&H
for(int i=0;i<CountCache.list.size();i++){ *G&3NSM-
CountBean cb=(CountBean)CountCache.list.getFirst(); i K,^|Q8
CountCache.list.removeFirst(); ]iezwz`'
ps.setInt(1, cb.getCountId()); \p.eY)>
ps.executeUpdate();⑴ \DMZ M
//ps.addBatch();⑵ c9O0YQ3&8
} nq%GLUH
//int [] counts = ps.executeBatch();⑶ 2'U+QK@
conn.commit(); &zV;p
}catch(Exception e){ CbW>yr
e.printStackTrace(); uz;zmK
} finally{ }'u0Q6Obj
try{ wNm 1H[{
if(ps!=null) { b=PB" -
ps.clearParameters(); 1ir~WFP
ps.close(); +yd{-iH
ps=null; 9f #6Q*/
} Jp 7m$D%
}catch(SQLException e){} W&=F<n`
DBUtils.closeConnection(conn); ab8F\%y-8
} ;d<RPVE:
} )(V!& w6
public long getLast(){
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return lastExecuteTime; L %20tm
} UPcx xtC
public void run(){ 8~|tl,
long now = System.currentTimeMillis(); 'U*Kb
if ((now - lastExecuteTime) > executeSep) { Y]neTX [ef
//System.out.print("lastExecuteTime:"+lastExecuteTime); AGMrBd|J{
//System.out.print(" now:"+now+"\n"); jM[]Uh
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); M0K+Vz=
lastExecuteTime=now; _>u0vGF-
executeUpdate(); 6b-E|;"]:^
} 5:vy_e&
else{ gJYX
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ?4sF:Y+\
} i%#
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} dOFK;
} 5pz(6gA
//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 "JpnmE[`
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类写好了,下面是在JSP中如下调用。 NR.YeKsBq
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<% f9a_:]F
CountBean cb=new CountBean(); chszP{-@X
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bM>5=Zox
CountCache.add(cb); ' }T6dS
out.print(CountCache.list.size()+"<br>"); wvz_)bN~A
CountControl c=new CountControl(); cr>"LAi
c.run(); a&C}'e"
out.print(CountCache.list.size()+"<br>"); &O\$=&, h
%>