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: by}C;eN
|k.%e4
CountBean.java tKS'#y!R
a+mrsyM
/* U80h0t%
* CountData.java p~Wy`g-
* 2WO5Af%
* Created on 2007年1月1日, 下午4:44 Nyx)&T&I
* 6W\G i>
* To change this template, choose Tools | Options and locate the template under XXDLbT'J
* the Source Creation and Management node. Right-click the template and choose i}Q"'?
* Open. You can then make changes to the template in the Source Editor. lcVZ 32MQ
*/ S:(YZ%#
Am
~P$dN
package com.tot.count; }G/!9Zq
_DouVv>
/** zgNzdO/B
* G!T_X*^q2U
* @author 5Z@0XI
*/ q-hR EO
public class CountBean { Lv&9s
private String countType; v<3KxP'a
int countId; a%nf
)-}|
/** Creates a new instance of CountData */ MxgJ+
public CountBean() {} 3\}>nE
public void setCountType(String countTypes){ Z% DJ{!Hnh
this.countType=countTypes; oRZ98?Y\B
} 5>6:#.f%!e
public void setCountId(int countIds){ [KL-T16
this.countId=countIds; .H@b zm
} ?}e^-//*i
public String getCountType(){ R53^3"q~
return countType; =&i#NSK
} j7BLMTF3v
public int getCountId(){ Y&<]:)
return countId; =PF2p'.o
} h! Bg}B~
} W{%X1::q$
xtBu]I)%
CountCache.java BCfmnE4%
IeZ9 "o h
/* k|,Y_h0Y
* CountCache.java R<B5<!+
* dVs=*GEl9
* Created on 2007年1月1日, 下午5:01 &,P; 7 R
* 7gcR/HNeF
* To change this template, choose Tools | Options and locate the template under ]Cs=EZr
* the Source Creation and Management node. Right-click the template and choose
OqWm5(u&S
* Open. You can then make changes to the template in the Source Editor. ppo0DC\>
*/ jlA6~n
PJ)l{c
package com.tot.count; "} "/d(
import java.util.*; +[R^ ?~VK
/** bg!(B<!X
* i)$P1h
* @author d>?C?F
*/ \%&A? D
public class CountCache { k'_f?_PBu
public static LinkedList list=new LinkedList(); IG{lr
/** Creates a new instance of CountCache */ h\p!J-V
public CountCache() {} k33\;9@k
public static void add(CountBean cb){ SXP(C^?C
if(cb!=null){ s1E 0atT
list.add(cb); %W8iC%~
} Ge/K.]>i
} eAo+w*D(
} UOFb.FRP>
up+0-!AH
CountControl.java ~&<t++ g
2F>Y{3&
/* "{r8'qn
* CountThread.java AmHj\NX$
* SzIzQR93&
* Created on 2007年1月1日, 下午4:57 $cK}Tlq
* m5iCvOP
* To change this template, choose Tools | Options and locate the template under &ocuZ-5`
* the Source Creation and Management node. Right-click the template and choose >I0;MNX
* Open. You can then make changes to the template in the Source Editor. p:TE##
*/ /='0W3+o*L
pHoHngyi&
package com.tot.count; ZT@=d$Z&t
import tot.db.DBUtils; (D%vN&F
import java.sql.*; .SjJG67OyA
/** \#(1IC`as
* y~\ujp_5w
* @author AwXzI;F^
*/ McN[
public class CountControl{ r&m49N,d
private static long lastExecuteTime=0;//上次更新时间 ]}PXN1(
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 :P}3cl_
/** Creates a new instance of CountThread */ iAZ8Y/
public CountControl() {} LT<2 n.S
public synchronized void executeUpdate(){ 5"@>>"3U
Connection conn=null; #%Bt!#
PreparedStatement ps=null; 2zqaR[C
try{ W,NqevXo:
conn = DBUtils.getConnection(); dkz%
Y]
conn.setAutoCommit(false); ~;3#MAG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); {7ji m
for(int i=0;i<CountCache.list.size();i++){ 0:
a2ER|J
CountBean cb=(CountBean)CountCache.list.getFirst(); s[{[pIH
CountCache.list.removeFirst(); \KnRQtlI
ps.setInt(1, cb.getCountId()); k7Bh[ ..!
ps.executeUpdate();⑴ !h4T3sO
//ps.addBatch();⑵ @Suz-j(H
} KR#,6
//int [] counts = ps.executeBatch();⑶ D#L(ZlD4
conn.commit(); <4LJ#Fx
}catch(Exception e){ >Xk42zvqn
e.printStackTrace(); ~jL%l
} finally{ ySr,HXz
try{ qg& /!\
if(ps!=null) { wHbkF#[:i
ps.clearParameters(); 4`Ud\Jm[s
ps.close(); H[u9C:}9b
ps=null; /IWAU)A0
} i"}z9Ae~.
}catch(SQLException e){} iT
:3e%
DBUtils.closeConnection(conn); 9$\s
v5
} -*'
?D@l
} 3<&:av3
public long getLast(){ IFTNr2I
return lastExecuteTime; o6MFMA+vi
} bI &<L O
public void run(){ ;|WUbc6&g
long now = System.currentTimeMillis(); qUd7O](b=?
if ((now - lastExecuteTime) > executeSep) { Ax&!Nz+?
//System.out.print("lastExecuteTime:"+lastExecuteTime); Ncz4LKzt
//System.out.print(" now:"+now+"\n"); zG#5lzIu,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); D!~ Y"4<
lastExecuteTime=now; ]gq)%T]
executeUpdate(); {!|4JquE_
} H7X-\K 1w
else{ J
_O5^=BP
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ww^\_KGu7
} ~o!-[
} %XGm\p
} =:&xdphZ+
//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 R'v~:wNTNs
?$6H',u
类写好了,下面是在JSP中如下调用。 i\6CE|
_p*9LsN$L
<% GM6,LzH
CountBean cb=new CountBean(); /Sj~lHh
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 45c?0tj
CountCache.add(cb); )$n%4 :
out.print(CountCache.list.size()+"<br>"); 5*$yY-A
CountControl c=new CountControl(); 1(o\GI3:
c.run(); 6j(/uF4!#
out.print(CountCache.list.size()+"<br>"); Dx-P]j)4x
%>