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: 1R}9k)JQ
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CountBean.java W%+02_/)
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/* DPf].i#
* CountData.java cI[i v
* gqv+|:#
* Created on 2007年1月1日, 下午4:44 fcdXj_u
* G
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* To change this template, choose Tools | Options and locate the template under }`L;.9
* the Source Creation and Management node. Right-click the template and choose |y7TYjg6
* Open. You can then make changes to the template in the Source Editor. M<Bo<,!ua
*/ n*9QSyJN]
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package com.tot.count; <9&GOaJ
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/** #v(As)4^
* -F/)-s6#!'
* @author FZgf"XM>
*/ }m<+tn3m
public class CountBean { sFZdj0tQ4
private String countType; p8 S~`fjV
int countId; N_
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/** Creates a new instance of CountData */ Dl.<(/
public CountBean() {} Vb?wwx7=
public void setCountType(String countTypes){ dXDyY
this.countType=countTypes; q2xAx1R`sV
} <,DMD
public void setCountId(int countIds){ jkl dr@t
this.countId=countIds; (A2ga):Pk
} jk`U7G*
public String getCountType(){ ?MywA'N@x
return countType; .~I:Hcf/
} kmBA
public int getCountId(){ _L)LyQD]T
return countId; GdC=>\]
} (;g/wb:
} !QdX+y<re
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CountCache.java ~<u\YIJ
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/* Fdl0V:<
* CountCache.java F$i50s
* WS&a9!3;
* Created on 2007年1月1日, 下午5:01 CHS}tCfos>
* y=9fuGL6
* To change this template, choose Tools | Options and locate the template under 9+(6/<
* the Source Creation and Management node. Right-click the template and choose %J6>Vc!ix=
* Open. You can then make changes to the template in the Source Editor. EiD41N
*/ 0<uL0FOT
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package com.tot.count; 0;a1 0b
import java.util.*; kK6t|Yn&
/** e lM<S3
* 1WaQWZ:=
* @author dgQ<>+9]6
*/ @[FO;4w
public class CountCache { iaMl>ua
public static LinkedList list=new LinkedList(); t(UBs-t
/** Creates a new instance of CountCache */ yuq o ^i
public CountCache() {} uWMSn
public static void add(CountBean cb){ _$A?
if(cb!=null){ YO.ddy*59
list.add(cb); 7lYf+&JZ
} , MqoX-+
} ;|\j][A
} nIOSP:'>
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CountControl.java bOYM-\
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/* NHU5JSlB
* CountThread.java L8E4|F}
* @@3NSKA
* Created on 2007年1月1日, 下午4:57 $2]>{g
* t0<RtIh9e
* To change this template, choose Tools | Options and locate the template under f^}n#
* the Source Creation and Management node. Right-click the template and choose 4<<eqxI$|
* Open. You can then make changes to the template in the Source Editor. Wf?[GO
*/ BC#`S&R
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package com.tot.count; Yx66Xy
import tot.db.DBUtils; o=![+g
import java.sql.*; L09r|g4Z
/** N:KM8PZ&~
* +i /4G.=*
* @author Bvj
*/ 5l,Lp'k
public class CountControl{ 1D1kjM^Bo
private static long lastExecuteTime=0;//上次更新时间 jc32s}/H
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +u |SX/C
/** Creates a new instance of CountThread */ lP4s"8E`h
public CountControl() {} Rm_+kp@\
public synchronized void executeUpdate(){ RHd no C
Connection conn=null; 1LSD,t|
PreparedStatement ps=null; /ZL6gRRA|
try{ non5e)w3@
conn = DBUtils.getConnection(); 3:w_49~:~
conn.setAutoCommit(false); |A|K);
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I(3YXv
VN
for(int i=0;i<CountCache.list.size();i++){ D{6BX-Dw.
CountBean cb=(CountBean)CountCache.list.getFirst(); ~md06"AYJ
CountCache.list.removeFirst(); h8k\~/iJ
ps.setInt(1, cb.getCountId()); DoBQ$Ke p
ps.executeUpdate();⑴ Jz0AYiCq
//ps.addBatch();⑵ _/ 5
} 3k8nWT:wT
//int [] counts = ps.executeBatch();⑶ <h|&7
conn.commit(); %"#ydOy
}catch(Exception e){ Y#P!<Q>}
e.printStackTrace(); P=P']\`p+
} finally{ jMX+uYx M
try{ ',D%,N}J
if(ps!=null) { K4RQ{fWpm
ps.clearParameters(); M)JozD%
ps.close(); H:Q4!<
ps=null; +~==qLsU
} O#{`Fj`
}catch(SQLException e){} zII^Ny8D
DBUtils.closeConnection(conn); 7uu\R=$
} 2H] 7 =j
} 39pA:3iTd
public long getLast(){ |<8Fa%!HHc
return lastExecuteTime; d|gfp:Z`a
} 5+b73R3r
public void run(){ JCB3 BZg7&
long now = System.currentTimeMillis(); <jaQ0S{|
if ((now - lastExecuteTime) > executeSep) { =RM]/O9
//System.out.print("lastExecuteTime:"+lastExecuteTime); O"X7 DgbC
//System.out.print(" now:"+now+"\n"); GUJ?6;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); WFmW[< g
lastExecuteTime=now; 3:c6x kaw
executeUpdate(); 4kK_S.&
} V~-tp^
else{ %5n'+- XVj
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); %Yg|QBm|
} _Wp.s]D [
} 8h=K S
} E2=vLI]
//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 $&jVEMia
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类写好了,下面是在JSP中如下调用。 VHLNJnA
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<% IO2@^jup
CountBean cb=new CountBean(); T;,,!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); m*lcIa
CountCache.add(cb); tu;Pm4q7
out.print(CountCache.list.size()+"<br>"); L@?3E`4/v
CountControl c=new CountControl(); LXth-j=]
c.run(); }P\6}cK
out.print(CountCache.list.size()+"<br>"); 3".#nN
%>