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: A3.I|/
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CountBean.java j|8!gW
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/* xKUWj<+/
* CountData.java 0Sk~m4fj(
* I~6(>Z{
* Created on 2007年1月1日, 下午4:44 rMVcoO@3
* T-yEn&r4)
* To change this template, choose Tools | Options and locate the template under #yIHr&'oX
* the Source Creation and Management node. Right-click the template and choose u ]y[g
* Open. You can then make changes to the template in the Source Editor. ^O<'Qp,[:
*/ ogSDV
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package com.tot.count; t]Ln(r
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/** f"gYXaVF+
* #qk=R7"Q
* @author MB:[: nX
*/ Wgs6}1bg
public class CountBean { sMAj?]hI$
private String countType; ~)#E?:h5
int countId; LK4NNZf7
/** Creates a new instance of CountData */ ">!pos`<C
public CountBean() {} x~uDCbL
public void setCountType(String countTypes){ 3=U#v<
this.countType=countTypes; OmkJP
} +5I5
public void setCountId(int countIds){ > dVhIbG
this.countId=countIds; ~-NSIV:f
} yp4[EqME
public String getCountType(){ =\u,4
return countType; |Isn<|_
} SFh<>J^ 0a
public int getCountId(){ !YpH\wUyvP
return countId; 8&HBR #
} uX!6:v]
} iVnMn1h
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CountCache.java 3]'ab-,Vp
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/* \:F$7 *Ne
* CountCache.java _'Jjt9@S
* L|<j/bP
* Created on 2007年1月1日, 下午5:01 b 1.S21
* L_9uwua.B~
* To change this template, choose Tools | Options and locate the template under Fs~*-R$
* the Source Creation and Management node. Right-click the template and choose x>mI$K(6M
* Open. You can then make changes to the template in the Source Editor. 1!V[fPJ
*/ \15'~]d
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package com.tot.count; 4".I*ij
import java.util.*; r[^.\&-
/** UAz^P6iQ`~
* u0<yGsEGD
* @author {S+?n[1r\
*/ D=vw0Q_3Y3
public class CountCache { 4~A$u^scn
public static LinkedList list=new LinkedList(); qLX<[UL
/** Creates a new instance of CountCache */ .3UJ*^(?
public CountCache() {} ?fP3R':s
public static void add(CountBean cb){ Y|b,pC|,
if(cb!=null){ yogL8V-^4
list.add(cb); hC8WRxEGq
} 8a@k6OZ
} u4T$
} q9_AL8_
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CountControl.java I6;6x
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/* ID`C
* CountThread.java >`&2]Wc)
* )N~ p4kp
* Created on 2007年1月1日, 下午4:57 r?Mf3U^G
* PfU\.[l$
* To change this template, choose Tools | Options and locate the template under #>KiX84
* the Source Creation and Management node. Right-click the template and choose :qqG%RB
* Open. You can then make changes to the template in the Source Editor. nu+^D$ait
*/ >WZbbd-
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package com.tot.count; @",#'eC"
import tot.db.DBUtils; tA4Ra,-c
import java.sql.*; n6,YA2yZO
/** :4 z\Q]
* 3QZm
*.
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* @author UkD\ma
*/ [O ^/"Qk
public class CountControl{ T=~d.&J
private static long lastExecuteTime=0;//上次更新时间 /N%i6t<xU
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 li?@BHEf
/** Creates a new instance of CountThread */ V;R gO}
public CountControl() {} g i/k#3_m
public synchronized void executeUpdate(){ MYb^G\K
Connection conn=null; S?`0,F
PreparedStatement ps=null; "|J6*s
try{ 4yqYs>
conn = DBUtils.getConnection(); XP!m]\E&I
conn.setAutoCommit(false); \ ;]{`
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); toDi70o
for(int i=0;i<CountCache.list.size();i++){ ( sl{Rgxe*
CountBean cb=(CountBean)CountCache.list.getFirst(); zOMxg00
CountCache.list.removeFirst(); -,;woOG
ps.setInt(1, cb.getCountId()); Kv1~,j6
ps.executeUpdate();⑴ zRLJ|ejMP
//ps.addBatch();⑵ uUx7>algF
} >G"fMOOkW
//int [] counts = ps.executeBatch();⑶ 5tkKd4VfL
conn.commit(); 6~ y'
}catch(Exception e){ KC; o
e.printStackTrace(); [ /*;}NUv
} finally{ ;Qq_
try{ r{d@74
if(ps!=null) { CeOA_M
ps.clearParameters(); Go:(R {P
ps.close(); !nJl.Y$
ps=null; yc9!JJMkH
} w+j\Py_G"
}catch(SQLException e){} 2.Ww(`swL
DBUtils.closeConnection(conn); v4E=)?
} 'l\PL1
} Hci>q`p#
public long getLast(){ iNl<<0a
return lastExecuteTime; %=2sz>M+
} 4<}@hk
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public void run(){ ]smu~t0\
long now = System.currentTimeMillis(); ;xw9#.d#D
if ((now - lastExecuteTime) > executeSep) { v,Z]Vqk
//System.out.print("lastExecuteTime:"+lastExecuteTime); (ot56`,k
//System.out.print(" now:"+now+"\n"); (t&`m[>K
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Z-ci[Zv
lastExecuteTime=now; bG"FN/vg
executeUpdate(); kk<%VKC
} qHe
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else{ '^WR5P<8c
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (t5y$bc
} }yrs6pQ
} &