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: M+%qVwp
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CountBean.java lM#,i\8Q
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/* ym_as8A*Q
* CountData.java aX*9T8H/
* @pH6FXVGzt
* Created on 2007年1月1日, 下午4:44 ]z#)XW3#i
* Fnay{F8z
* To change this template, choose Tools | Options and locate the template under )l/
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* the Source Creation and Management node. Right-click the template and choose ia-ht>F*;
* Open. You can then make changes to the template in the Source Editor. k7j[tB#
*/ CD5% iFy
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package com.tot.count; 6uKP
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/** BoOuN94
* [rW];H8:~
* @author x-W~&`UU
*/ EhW"s%Q
public class CountBean { Lf%=vd
private String countType; dp&G([
int countId; Zz+v3o0
/** Creates a new instance of CountData */ [lVfhXc&
public CountBean() {} TY5R=jh=
public void setCountType(String countTypes){ *e<}hmDr
this.countType=countTypes; Uq`6VpZ
} _+Sf+ta
public void setCountId(int countIds){ o^Lq8u;i*
this.countId=countIds; )y i~p
} LbYIRX
public String getCountType(){ G!wb|-4<$
return countType; 6b$C/
} =vvd)og
public int getCountId(){ lrL:G[rt
return countId; (h=]Ox
} /W .G-|:
} oI'& &Bt
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CountCache.java ]mz '(t
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/* /y|ZAN
* CountCache.java 2`j{n\/
* A{M7
* Created on 2007年1月1日, 下午5:01 (y~%6o6
* `'>~(8&zE
* To change this template, choose Tools | Options and locate the template under ob'"
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* the Source Creation and Management node. Right-click the template and choose !uO@4]:Y
* Open. You can then make changes to the template in the Source Editor. ~j(vGO3JB
*/ 87W!R<G
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package com.tot.count; bsr]Z&9rrk
import java.util.*; :I7mMy*
/**
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* R*0mCz^+h
* @author ,zr,>^v
*/ 6 eu7&Kj'
public class CountCache { 0rz1b6F5,
public static LinkedList list=new LinkedList(); JtsXMZz
/** Creates a new instance of CountCache */ l'@!'
public CountCache() {} B3D}'<
public static void add(CountBean cb){ VBS}2>p
if(cb!=null){ MkjB4:"
list.add(cb); "'@D\e}
} <SQR";
} "\T-r 2
} RgJbM\`}?
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CountControl.java z^jmf_
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/* "I:*
* CountThread.java RAk"C!&^m
* HV-;?5
* Created on 2007年1月1日, 下午4:57 I8% -ii
* qY'+@^<U;
* To change this template, choose Tools | Options and locate the template under Pk;yn;
* the Source Creation and Management node. Right-click the template and choose 7U1M;@y
* Open. You can then make changes to the template in the Source Editor. J/E''*
*/ Ea][:3
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package com.tot.count; g|->W]q@;
import tot.db.DBUtils; 8y
import java.sql.*; *o\AP([@
/** >~]|o
* a5saN5)H
* @author :T?WN+3
*/ 85)C7tJ-g
public class CountControl{ 8_G6X\q};
private static long lastExecuteTime=0;//上次更新时间 <[-{:dH,5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &0\:MJc
/** Creates a new instance of CountThread */ = Ul"{T<
public CountControl() {} ujkWVE'
public synchronized void executeUpdate(){ lY(_e#
Connection conn=null;
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PreparedStatement ps=null; =nc;~u|]
try{ M!mw6';k
conn = DBUtils.getConnection(); kksffzG
conn.setAutoCommit(false); s!
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &A.0(s
for(int i=0;i<CountCache.list.size();i++){ lMh>eX
CountBean cb=(CountBean)CountCache.list.getFirst(); LyNmn.nN
CountCache.list.removeFirst(); Ok@`<6v
ps.setInt(1, cb.getCountId()); E>i<2
ps.executeUpdate();⑴ FG{,l=Z0
//ps.addBatch();⑵ vnVT0)Lel
} rc<Ix
//int [] counts = ps.executeBatch();⑶ : _:)S
conn.commit(); %72(gR2Wa2
}catch(Exception e){ 8 >LDo"<
e.printStackTrace(); M%Rr=
} finally{ ]+m2pEO
try{ U1Fo #L
if(ps!=null) { >i >|]
ps.clearParameters(); hcRe,}wJ
ps.close(); jP_s(PQ
ps=null; 53ZbtEwhwr
} <82&F
}catch(SQLException e){} e1E_$oJP
DBUtils.closeConnection(conn); F=w:!tqA
} kZ)}tA7j
} (~{Y}n]s
public long getLast(){ 94dd )/a
return lastExecuteTime; ,%N[FZ`|
} xP9h$!
public void run(){ p=A,yGDV
long now = System.currentTimeMillis(); 7RBEEE`)
if ((now - lastExecuteTime) > executeSep) { (3D&