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: ZK%Kgk[\:~
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CountBean.java v/]Qq
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/* Nvi Fq
* CountData.java D!c1;IHZ
* U LV)0SB
* Created on 2007年1月1日, 下午4:44 G`9cd\^
* \I'f3
* To change this template, choose Tools | Options and locate the template under ]d[Rf$>vu0
* the Source Creation and Management node. Right-click the template and choose ^).WW
* Open. You can then make changes to the template in the Source Editor. (s5<
*/ >6*(}L9
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package com.tot.count; <j{0!J@:
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/** lb-S0plw
* y{@P1{
* @author y;zt_O/
*/ ,:Rft
public class CountBean { }DJ|9D^yf
private String countType; 0m]~J_
int countId; hTlnw[I
/** Creates a new instance of CountData */ %~][?Y ><
public CountBean() {} 3Gc ,I:\
public void setCountType(String countTypes){ ){+.8KI
this.countType=countTypes; zJz82jMm
} :D<:N*9i
public void setCountId(int countIds){ Oqd"0Qt-
this.countId=countIds; HyZVr2
} x{=[w`
public String getCountType(){ ERUs0na]
return countType; z0\;m{TH
} GS$ZvO
public int getCountId(){ c1pq]mz|z
return countId; aQl?d<|+lk
} MZ;"J82p
} ,Wz[tYL*
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CountCache.java C/{nr-V3u
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/* Wv6z%r<
* CountCache.java t-.2+6"\
* dE 3i=
* Created on 2007年1月1日, 下午5:01 I;`Ko_i
* 04I6-}6
* To change this template, choose Tools | Options and locate the template under ~AEqfIx*^&
* the Source Creation and Management node. Right-click the template and choose L4\SBO
* Open. You can then make changes to the template in the Source Editor. ipx@pNW;"
*/ } l :mN
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package com.tot.count; z*Myokhf
import java.util.*; 9\AEyaJFZ
/**
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* ^U-vD[O8
* @author C1ZFA![
*/ 7xLo4
public class CountCache { }9L 40)8
public static LinkedList list=new LinkedList(); w/lXZg
/** Creates a new instance of CountCache */ p_rN1W
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public CountCache() {} U@o2gjGN
public static void add(CountBean cb){ g`%ED0aR
if(cb!=null){ QVnO
list.add(cb); |#DC.Ga!
} 7bgnZ]r8t
} \SYPu,ZT
} &Iv\jhq
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CountControl.java aX>4Tw
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/* "o\6k"_c>
* CountThread.java hN>('S-cq
* ^BF@j4*~
* Created on 2007年1月1日, 下午4:57 0C7thl{Dms
* ;']vY
* To change this template, choose Tools | Options and locate the template under 3Ew"[FUs
* the Source Creation and Management node. Right-click the template and choose a-z23$3
* Open. You can then make changes to the template in the Source Editor. 7i-W*Mb:
*/ q#mFN/.(+
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package com.tot.count; [JX}1%NA
import tot.db.DBUtils; vR6^n~
import java.sql.*; ef;&Y>/
/** 'DL;c@}37
* *eJhd w*
* @author oyKt({
*/ SX_kr^#
public class CountControl{ "sX[p
private static long lastExecuteTime=0;//上次更新时间 +t7c&td\
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 n.Ur-ot
/** Creates a new instance of CountThread */ 'U|MM;(
public CountControl() {} D{,[\^c
public synchronized void executeUpdate(){ /o<}]]YBF
Connection conn=null; 8I5 VrT
PreparedStatement ps=null; O4b-A3:
try{ 9E->;0-
conn = DBUtils.getConnection(); H3p4,Y}'#
conn.setAutoCommit(false); +P>
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); X]+(c_i:hC
for(int i=0;i<CountCache.list.size();i++){ *sc0,'0
CountBean cb=(CountBean)CountCache.list.getFirst(); f^[{k
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CountCache.list.removeFirst(); bMK#^ZoH
ps.setInt(1, cb.getCountId()); Lyf? V(S
ps.executeUpdate();⑴ hr~qt~Oi
//ps.addBatch();⑵ W(u6J#2
} ZbZAx:L
//int [] counts = ps.executeBatch();⑶ }\PE {
conn.commit(); 'gk81@|
}catch(Exception e){ zJy 89ib'
e.printStackTrace(); h+zkVRyA
} finally{ .J<qfQ
try{ w]o:c(x@
if(ps!=null) { brYYuN|Vc
ps.clearParameters(); J^s<