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: )Nbc/nB$
:V-k'hm
&
CountBean.java 69Nw/$
80|onP\L
/* <|a=hHPi:
* CountData.java \^9pW 2v
* Dzr e'
* Created on 2007年1月1日, 下午4:44 !n eo\
* s
_~IZ%+<.
* To change this template, choose Tools | Options and locate the template under IK'F{QPH
* the Source Creation and Management node. Right-click the template and choose bw9
nB{C<
* Open. You can then make changes to the template in the Source Editor. \ZMP_UU(
*/ j9:/RJS
HMV)U{
package com.tot.count; JdiP>KXV
C`NmZwL
/** xI?0N<'.*q
* }~F~hf>s
* @author Q ]"jD#F
*/ Wwhgo.Wx
public class CountBean { D,Lp|V
private String countType; ? Vp%=E
int countId; .xl.P7@JJ
/** Creates a new instance of CountData */ o\4CoeG
public CountBean() {} *g_w I%l
public void setCountType(String countTypes){ oxfF`L"
this.countType=countTypes; 'w.}2(
} #Ao !>qCE
public void setCountId(int countIds){ 90fs:.
this.countId=countIds; t`YWwI.
} rP'AJDuq
public String getCountType(){ K(VW%hV1
return countType; s?c JV`
} )3%@9
public int getCountId(){ 'Jydu
return countId; Xwq]f:@V
} Y5Z!og
} VI_+v[Hk/
g1{/ 5{XI
CountCache.java ubbnFE&PD
{<K=*rrZ
/* Yw)Fbt^
* CountCache.java c-B/~&
* I]R9HGJNlJ
* Created on 2007年1月1日, 下午5:01 m#\[m<F
* ,mKObMu
* To change this template, choose Tools | Options and locate the template under Kkv<"^H
* the Source Creation and Management node. Right-click the template and choose $UvPo0{
* Open. You can then make changes to the template in the Source Editor. c}-(. eu
*/ zvO:"w}
iZxt/}1X0
package com.tot.count; dv!r.
import java.util.*; 1e}8LH7
/** 0<.RA%dj
* `}fw1X5L
* @author cWa)#:JOV
*/ "=A>}q@;H
public class CountCache { EzpFOqJG
public static LinkedList list=new LinkedList(); g"K>5Cb
/** Creates a new instance of CountCache */ gU;&$
public CountCache() {} {(tHk_q
public static void add(CountBean cb){ _<*Hv*Zm
if(cb!=null){ ;ME)Og
list.add(cb); gzdG6"
} ;Vu5p#,O<M
} +Xy*?5E;C
} {mTytT
R_N:#K.M
CountControl.java [6tSYUZs
%j+xgX/&
/* rv7{Ow_Y
* CountThread.java "G?Yrh
* <1 "+,}'x
* Created on 2007年1月1日, 下午4:57 1m@^E:w
* BVpO#c~I
* To change this template, choose Tools | Options and locate the template under M.[rLJZ4
* the Source Creation and Management node. Right-click the template and choose L,LNv
* Open. You can then make changes to the template in the Source Editor. xDLG=A%]z
*/ 0-d>I@j
GJA`l8`SQ
package com.tot.count; \Qy$I-Du
import tot.db.DBUtils; tTanW2C
import java.sql.*; F]+~x/!
/** p $`92Be/
* ?cy4&]s
* @author wvby?MhPY
*/ ZH 6\><My
public class CountControl{ +-$Ko fnM
private static long lastExecuteTime=0;//上次更新时间 L{fFC%|l2L
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ~bK9R0|<
/** Creates a new instance of CountThread */ O XP\R
public CountControl() {} G}nO@
public synchronized void executeUpdate(){ v|';!p|
Connection conn=null; WyhhCR=;
PreparedStatement ps=null; Ea $aUORm
try{ j2 %^qL
conn = DBUtils.getConnection(); 5*-3?
<)e
conn.setAutoCommit(false); 98XVa\|tl
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }^kL|qmjR
for(int i=0;i<CountCache.list.size();i++){ ??&<k
CountBean cb=(CountBean)CountCache.list.getFirst(); rNDrp@A>
CountCache.list.removeFirst(); w3T ]H_V
ps.setInt(1, cb.getCountId()); 9&]M**X
ps.executeUpdate();⑴ \wvg,j=
//ps.addBatch();⑵ E%N2k|%8d_
} x.mrCJn)
//int [] counts = ps.executeBatch();⑶ '@nbqM
conn.commit(); @OpNHQat9
}catch(Exception e){ dtt ~ Bd
e.printStackTrace(); jNDx,7F-
} finally{ V@-)\RZm
try{ ]; $] G-
if(ps!=null) { <If35Z)~
ps.clearParameters(); #U
mF-c
ps.close(); w8Sv*K
ps=null; 8+Llx
} r=.A'"Kf
}catch(SQLException e){} G\d$x4CVGc
DBUtils.closeConnection(conn); pKG<Nvgz&
} k(VB+k"3
} s@4nWe
public long getLast(){ cZ8.TsI~
return lastExecuteTime; zmuMWT;
} x Gk6n4Gg
public void run(){ FDzqL;I
long now = System.currentTimeMillis(); O*6n$dUj3
if ((now - lastExecuteTime) > executeSep) { 1 T<+d5[C
//System.out.print("lastExecuteTime:"+lastExecuteTime); I{'f|+1
//System.out.print(" now:"+now+"\n"); _f0C Y"
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); HeGYu?&
lastExecuteTime=now; 6?tlU>A2s
executeUpdate(); QF2q^[>w6
} CTa#Q,
else{ Elj_,z
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {V19Zv"j
} #SVNHpx
} [(kB
5 a
} yM.IxpT#$
//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 ZFm`UXS
w8Q<r.
类写好了,下面是在JSP中如下调用。 )::>q5c
9# 4Y1L S)
<% #FOqP!p.E
CountBean cb=new CountBean(); Cs3^9m6;d
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); y;cUl, :v
CountCache.add(cb); zdl%iop3e
out.print(CountCache.list.size()+"<br>"); = {'pUU
CountControl c=new CountControl(); 3\O|ii
c.run(); hOv={:
out.print(CountCache.list.size()+"<br>"); PC$CYW5
%>