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: 7.%f01/i
Am#m>^!qb
CountBean.java BpH|/7
e:qo_eSC^-
/* 0HjJaML
* CountData.java ab{;Z5O
* ?LM:RADCm
* Created on 2007年1月1日, 下午4:44 h>dxBN
* ]yo_wGiwY
* To change this template, choose Tools | Options and locate the template under fb/qoZ
* the Source Creation and Management node. Right-click the template and choose aJI>FTdK
* Open. You can then make changes to the template in the Source Editor. E\w+kAAf
*/ fzl=d_
3KtAK9PT
package com.tot.count; !@( M_Z'
77``8,
/** P!5Z]+B#
* AQ-mE9>P
* @author P2>:p%Z
*/ zgK;4
22$m
public class CountBean { 8AryIgy>@
private String countType; D^nxtuT*
int countId; 658\#x8|
/** Creates a new instance of CountData */ ja?s@Y}-9s
public CountBean() {} C+`xx('N9
public void setCountType(String countTypes){ .XIr?>G
this.countType=countTypes; EVG"._I@
} A xf^hBP
public void setCountId(int countIds){ l7ZB3'
this.countId=countIds; Ex6o=D2
} @2u#93Y
public String getCountType(){ Q]/B/
return countType;
t7&Dwmck9
} 9MT3T?IS
public int getCountId(){ 3#9uEDdE
return countId; #7+]%;h
} ^=k{~
} WI6(#8^p
>ZX|4U[$P
CountCache.java !Pw$48cg
q=njKC
/* "i&fp:E0
* CountCache.java |IAW{_9)U
* )PwQ^||{
* Created on 2007年1月1日, 下午5:01 +uELTHH=
* w3d34*0$
* To change this template, choose Tools | Options and locate the template under ^eobp.U
* the Source Creation and Management node. Right-click the template and choose YN/u9[=`
* Open. You can then make changes to the template in the Source Editor. C*a,<`
*/ `T=1<Tw c
$}db /hY*
package com.tot.count; n_J5zQJ
import java.util.*; Gh'X.?3
/** f -7S:,
* S4)A6z$
* @author nz[
m3]
*/ "(<%Ua
public class CountCache { @O'I)(To
public static LinkedList list=new LinkedList(); q4+Yv2e
<r
/** Creates a new instance of CountCache */ w?_`/oqd|
public CountCache() {} J)#S-ZB+'k
public static void add(CountBean cb){ ac|/Y$\w
if(cb!=null){
A0OB$OK
list.add(cb); )L >Q;'
} 0TmZ*?3!4
} hD*(AJ
} 2qlIy
{a.
<`
CountControl.java {d,?bs)
\TZ|S,FS
/* bH,M,xIL2
* CountThread.java ;7L ;
* 3
&Sp@,
* Created on 2007年1月1日, 下午4:57 =D5wqCT(Q
* |WBZN1W)
* To change this template, choose Tools | Options and locate the template under eKyqU9
* the Source Creation and Management node. Right-click the template and choose SetX#e?q~
* Open. You can then make changes to the template in the Source Editor. p.5e:
i^LJ
*/ nn'Af,ko/
:kt/$S^-
package com.tot.count; Iqx84
import tot.db.DBUtils; H~eGgm;p
import java.sql.*; |*ReqM|_C
/** ?;_O
9
* >C*4_J7
* @author e+{BJN
vz
*/ lA]N04 d
public class CountControl{ "Vx6 #u@}
private static long lastExecuteTime=0;//上次更新时间 6`Lcs
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -zdmr"CA
/** Creates a new instance of CountThread */ PV(4$I}
public CountControl() {} 5/,Qz>QE[
public synchronized void executeUpdate(){ _-RyHgX
Connection conn=null; 8RU.}PD
PreparedStatement ps=null; n>S2}y
try{ bM ^7g
conn = DBUtils.getConnection(); >x*)GPDa
conn.setAutoCommit(false); FllX za)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); `6}Yqh))
for(int i=0;i<CountCache.list.size();i++){ [1U{ci&=p
CountBean cb=(CountBean)CountCache.list.getFirst(); "O``7HA}
CountCache.list.removeFirst(); v1h.pbz`w
ps.setInt(1, cb.getCountId()); Hr&Ere8.4p
ps.executeUpdate();⑴ E?_ zZ2
//ps.addBatch();⑵ ~5T$8^K
} ']h
IfOD"r
//int [] counts = ps.executeBatch();⑶ sjn:O'
conn.commit(); ?aFZOc4
}catch(Exception e){ 5aG5BA[N
e.printStackTrace(); u-:MVEm
} finally{ LZa%
x
try{ 3e *-\TP-
if(ps!=null) { T0Q51Q
ps.clearParameters(); E<k^S{
ps.close(); fdLBhe#9M
ps=null; ?M~
k$
} S eOy7
}catch(SQLException e){} D7gHE
DBUtils.closeConnection(conn); ]VDn'@uM
} #2N_/J(U
} Wj tft%
public long getLast(){ 4kh8W~i;/
return lastExecuteTime; _@K YF)
} 7f*
RM
public void run(){ r>O|L%xpv
long now = System.currentTimeMillis(); 3daC;;XO
if ((now - lastExecuteTime) > executeSep) { :X Lp
//System.out.print("lastExecuteTime:"+lastExecuteTime); 2lo:a{}j
//System.out.print(" now:"+now+"\n"); %I0}4$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &Sa~/!M
lastExecuteTime=now; 7D9]R#-K
executeUpdate(); 1yS&~
y?a
}
QAUykS8
else{ o} {-j
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); t#~XLCE
} _*n)mlLln
} e=L*&X
} \XDmK
//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 [8z&-'J=
H?{MRe
类写好了,下面是在JSP中如下调用。 a'A s
QF&6?e06p0
<% ]'UgZsJ
CountBean cb=new CountBean(); ~of,,&
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); _#vGs:-x&
CountCache.add(cb); ^)<