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: )vFJx[a<n`
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CountBean.java `JGV3nN
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/* |Go?A/'
* CountData.java qFo'"z`84
* 5V5E,2+
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* Created on 2007年1月1日, 下午4:44 ,haCZH{
* 9Se7
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* To change this template, choose Tools | Options and locate the template under ^ $M@yWX6
* the Source Creation and Management node. Right-click the template and choose HeagT(rN'
* Open. You can then make changes to the template in the Source Editor. @Fp-6J
*/ !vU$^>zo~
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package com.tot.count; b5hJaXJN
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/** (Yzy;"iAu
* &^C<J
* @author :GU6v4u
*/ edh?I1/
public class CountBean { Hz}6XS@
private String countType; "JLKO${ Y
int countId; .!ThqYo
/** Creates a new instance of CountData */ {
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public CountBean() {} }U=|{@%
public void setCountType(String countTypes){
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this.countType=countTypes; e>-a\g
} 5} 9}4e
public void setCountId(int countIds){ X]J]7\4tF\
this.countId=countIds; G:f\wK[
} "#H@d+u
public String getCountType(){ (o/HLmr@Y
return countType; S~QL
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} =X(8[ e
public int getCountId(){ m@hmu}qz-
return countId; WKf->W
} '/^bO# G:
} 4~Ptn / g
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CountCache.java P=:mn>
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/* #"^F:: b-
* CountCache.java VZ?"yUZ Id
* i2ap]
* Created on 2007年1月1日, 下午5:01 4WV'\R+m
* VtX9}<Ch~
* To change this template, choose Tools | Options and locate the template under #On EQ:
* the Source Creation and Management node. Right-click the template and choose lP>}9^7I!
* Open. You can then make changes to the template in the Source Editor. Vy-EY*r|
*/ C3n_'O
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package com.tot.count; ;}!hgyq
import java.util.*; 4J=6A4O5Z
/** K-&&%Id6R
* pA(B~9 WQ
* @author ~429sT(
*/
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public class CountCache { ;2||g8'
public static LinkedList list=new LinkedList(); @add'>)
/** Creates a new instance of CountCache */ C WJGr:}&
public CountCache() {} {Mc^[}9
public static void add(CountBean cb){ :` >|N|i
if(cb!=null){ V[<]BOM\v
list.add(cb); j?&Rf,,%
} NZ(c>r6
} MS~c
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} C9-IJj
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CountControl.java u~#QvA~]
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/* 9$&+0
* CountThread.java cPh
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* H6ff b)&
* Created on 2007年1月1日, 下午4:57 U$[C>~ r
* v:*t5M
>
* To change this template, choose Tools | Options and locate the template under $vNz^!zgV
* the Source Creation and Management node. Right-click the template and choose ^qL2Q*
* Open. You can then make changes to the template in the Source Editor. }]1=?:tX%
*/ 2Y~6~*8*~
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package com.tot.count; kG:,Ff>
import tot.db.DBUtils; q=bW!.#?
import java.sql.*; l MCoc 'ae
/** ~]HeoQK
* 6iwIEb
* @author yvxdl=s
*/ x0^O?UR
public class CountControl{ AtRu)v6r
private static long lastExecuteTime=0;//上次更新时间 ZCJOh8
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3.q%?S}*
/** Creates a new instance of CountThread */ 1eC1Cyw
public CountControl() {} uJz<:/rwZ-
public synchronized void executeUpdate(){ O) ks
Connection conn=null; 6"^Yn.
PreparedStatement ps=null; wB6ILTu1
try{ ViV"+b#gu
conn = DBUtils.getConnection(); t+'|&b][Qi
conn.setAutoCommit(false); c@RMy$RTF
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $x,?+N
for(int i=0;i<CountCache.list.size();i++){ i>!7/o
CountBean cb=(CountBean)CountCache.list.getFirst(); [6@{^
CountCache.list.removeFirst(); sY4sq5'!
ps.setInt(1, cb.getCountId()); i"=6n>\
ps.executeUpdate();⑴ 1O
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//ps.addBatch();⑵ Sa!r ,l
} ]3@6o*R;
//int [] counts = ps.executeBatch();⑶ pkjf5DWp
conn.commit(); bWzv7#dd=
}catch(Exception e){ z=TaB^-)
e.printStackTrace(); }mRus<Ax
} finally{ >
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try{
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if(ps!=null) { QJc3@
ps.clearParameters(); TJ@@kSSbl
ps.close(); 3F' {JP
ps=null; H`/QhE
} W=T3spV
}catch(SQLException e){} KlMrM% ;y
DBUtils.closeConnection(conn); %}
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} y2k'^zE
} jU2Dpxkt
public long getLast(){ P(I`^x
return lastExecuteTime; 5~T`R~Uqb
} BKDs3?&
public void run(){ {9sA'5
long now = System.currentTimeMillis(); )Lht}I ]:
if ((now - lastExecuteTime) > executeSep) { I`"8}d@Jm
//System.out.print("lastExecuteTime:"+lastExecuteTime); J+f
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//System.out.print(" now:"+now+"\n"); rj qX|
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Ju3-ZFUS4
lastExecuteTime=now; J(*qOGBD
executeUpdate(); aY 8"Sw|4
} l2uh"!
else{ (vm&&a@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); fMe "r*SU
} Rk2V[R.`S
} |FZ)5
} DA)+)PhY7K
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 Q3MG+@) S
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类写好了,下面是在JSP中如下调用。 1PWs">*(
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<% "p>$^
CountBean cb=new CountBean(); NNZ%jJy?=,
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); &6fNPD(|
CountCache.add(cb); _E eH
out.print(CountCache.list.size()+"<br>"); ( zQ)EHRD
CountControl c=new CountControl(); =;DmD?nZ
c.run(); sg"J00
out.print(CountCache.list.size()+"<br>"); }:u" ?v=|j
%>