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: %v++AcE
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CountBean.java 9.5hQZ
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/* rn1FCJ<;H
* CountData.java ?5m[Qc(<
* '{EBK
* Created on 2007年1月1日, 下午4:44 tYt/m6h
* qIQvix$8
* To change this template, choose Tools | Options and locate the template under _\ n'uW$
* the Source Creation and Management node. Right-click the template and choose YW"?Fy
* Open. You can then make changes to the template in the Source Editor. g<~[k?~J
*/ Tr}@fa
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package com.tot.count; 8<u_ wt@
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/** 6USet`#
* BzH7E[R49
* @author 9s)YPlDz
*/ .a:Oj3=0
public class CountBean { B\bIMjXV
private String countType; IsO'aFK)ln
int countId; rS9*_-NH
/** Creates a new instance of CountData */ m^_)aS
public CountBean() {} 'w.:I
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public void setCountType(String countTypes){ WPyd ^Y<
this.countType=countTypes; ee&QZVL>
} KM(U-<<R
public void setCountId(int countIds){ {rOz[E9vm
this.countId=countIds; Ks09F}
} S5RS?ya
public String getCountType(){ D00rO4~6D%
return countType; U^ BB|
} xtU)3I=F%
public int getCountId(){ :i*JlKHJd
return countId; 9!V<=0b/
} ]\P
} ?"AcK"v
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CountCache.java ;BoeE3*
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/* xPqpNs-,
* CountCache.java Z<y+D-/
* ?MeP<5\A
* Created on 2007年1月1日, 下午5:01 K1z"..(2J
* zE.4e&m%Z?
* To change this template, choose Tools | Options and locate the template under fx.FHhVu
* the Source Creation and Management node. Right-click the template and choose UeE& 8{=d
* Open. You can then make changes to the template in the Source Editor. l)VMF44
*/ ]@ETQ8QN
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package com.tot.count; 0*:]eM};P
import java.util.*; 1`_Mc ]
/** -<&"geJA
* oB3>0Pm*a.
* @author 2ok>z$Y
*/ ..;LU:F
public class CountCache { Cgw# c%
public static LinkedList list=new LinkedList(); L0|Vc9
/** Creates a new instance of CountCache */ aqs']
public CountCache() {} Q8Usyc'3
public static void add(CountBean cb){ F>A-+]X3o
if(cb!=null){ Q+ G=f
list.add(cb); 7"4|`y^#
} @c$mc
} e5fJN)+a
} T:cSv
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CountControl.java e~rBV+f
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/* jopC\Z
* CountThread.java 0; V{yh
* BY,%+>bc)
* Created on 2007年1月1日, 下午4:57 1[3"|
* !^q<)!9<EO
* To change this template, choose Tools | Options and locate the template under mMT7`r;l
* the Source Creation and Management node. Right-click the template and choose -lSm:O@'
* Open. You can then make changes to the template in the Source Editor. pSq\3Hp]Q
*/ `-ENKr]
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package com.tot.count; 5bmtUIj
import tot.db.DBUtils; )IZ$R*Y{
import java.sql.*; @ n;WVG
/** ~n"V0!:'4
* IRo[|&c
* @author 0]>p|m9K^<
*/ `p1`Sxz?
public class CountControl{ J+DuQ;k;
private static long lastExecuteTime=0;//上次更新时间 LZ&CGV"Z-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 b'9G`Y s^
/** Creates a new instance of CountThread */ G=Ka{J
public CountControl() {} %I Y-0\
public synchronized void executeUpdate(){ 8Qu].nKe
Connection conn=null; [+GQ3Z\
PreparedStatement ps=null; T_AZCl4d
try{ FIU(2
conn = DBUtils.getConnection(); |BYD] vK
conn.setAutoCommit(false); E?Q=#+}U
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <;9vwSH>
for(int i=0;i<CountCache.list.size();i++){ b@,=;Y)O
CountBean cb=(CountBean)CountCache.list.getFirst(); ,b{G(sF
CountCache.list.removeFirst(); -]'Sy$,A
ps.setInt(1, cb.getCountId()); MiOSSl};
ps.executeUpdate();⑴ zi*D8!_C
//ps.addBatch();⑵ e4CG=K3s
} L4kYF~G:4
//int [] counts = ps.executeBatch();⑶ r="X\ [on
conn.commit(); >+oQxml6nI
}catch(Exception e){ 9@D,ZSi
e.printStackTrace(); I8^z\ef&
} finally{ j-{WPJa4\
try{ PI0/=kS
if(ps!=null) { sOJ"~p
ps.clearParameters(); Fd'Ang6"
ps.close(); 8a?V h^
ps=null; Uk*s`Y
} ol`]6"Sc
}catch(SQLException e){} ^Gs!" Y
DBUtils.closeConnection(conn); kf5921(P
} ;ejC:3yO
} ZTS*E,U%
public long getLast(){ NmtBn^t
return lastExecuteTime; %8{' XJ!
} yY_]YeeR
public void run(){ nh9K(
long now = System.currentTimeMillis(); kt;X|`V{5z
if ((now - lastExecuteTime) > executeSep) { wRie{Vk
//System.out.print("lastExecuteTime:"+lastExecuteTime); /[EI0~P
//System.out.print(" now:"+now+"\n"); `VBjH]$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); .Uih|h
lastExecuteTime=now; >656if O
executeUpdate(); ,9+@\
} 'w9tZO\2
else{ ',1rW
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); &x=<>~Ag3
} r&ToUU 5
} F1Z20)8K
} e[e2X<&0RT
//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 &a