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: @WKJ7pt`'N
_a?x)3\v
CountBean.java l0',B*og
\Y:zg3q*
/* $Zrc-tkV
* CountData.java YO@~y*,
* K"Irg.
* Created on 2007年1月1日, 下午4:44 .k!2{A
* G [yI[7=d
* To change this template, choose Tools | Options and locate the template under kOel
!A
* the Source Creation and Management node. Right-click the template and choose YB{'L +Wbw
* Open. You can then make changes to the template in the Source Editor. #iD`Bg!VXc
*/ PEKXPFN
KlwBoC/{K
package com.tot.count; Z y6kA\q
V3
~&R:Z9e
/** 1[RI
07g7*
* vBY?3p,0p
* @author R\6dvd
*/ #N97
public class CountBean { _w5c-\-PUM
private String countType; !.|A}8nK
int countId; te>Op 1R
/** Creates a new instance of CountData */ x+Ly,9nc$
public CountBean() {} q?0&0
public void setCountType(String countTypes){ 1yc$b+TH
this.countType=countTypes; [A;0IjKam
} R&/"?&pfa
public void setCountId(int countIds){ =|
r%
lx
this.countId=countIds; e&<=+\ul
} v+d`J55
public String getCountType(){ 1:I _;O_
return countType; b^P\Kky
} gb^'u
public int getCountId(){ `7V'A
return countId; >(W t
} [/J(E\9
} 6* tky;
8feLhWg'P
CountCache.java 9J}^{AA
G$lE0_j2{
/* sg<c1
* CountCache.java a7z%)i;Z
* Nqj5, 9*c
* Created on 2007年1月1日, 下午5:01 JWxSN9.X
* ae+*gkPv8
* To change this template, choose Tools | Options and locate the template under J@q!N;eh|
* the Source Creation and Management node. Right-click the template and choose c8o2* C$
* Open. You can then make changes to the template in the Source Editor. 8(-N;<Ef2
*/ H ;HFen|
AD'c#CT
package com.tot.count; hi ),PfAV
import java.util.*; ]vCs9* |B
/** GkdxwuRw
* X&%;(`
* @author gYw=Z_z
*/ 3e;ux6
public class CountCache { $h1pL>^J
public static LinkedList list=new LinkedList(); )},/=#C0
/** Creates a new instance of CountCache */ pvM`j86 _
public CountCache() {} +'9xTd
public static void add(CountBean cb){ xI5zP?
_v
if(cb!=null){ "!o|^nN,
list.add(cb); S"Ag7i
} ,Mn?h\
} 2cv=7!K4Uv
} 5pxw[c53#
~/Kqkhq+c
CountControl.java *nY$YwHB
6?l|MU"Q.
/* ~:UAL}b{\~
* CountThread.java ~=Fp0l)#
* <'P+2(Oi
* Created on 2007年1月1日, 下午4:57 Ke\FzZ]
* U]iZ3^8VT
* To change this template, choose Tools | Options and locate the template under W=!D[G R
* the Source Creation and Management node. Right-click the template and choose Qy'-3GB
* Open. You can then make changes to the template in the Source Editor. 0&6(y*
#Z
*/ ru*}lDJ
]~'pYOB
package com.tot.count; +tv"j;z
import tot.db.DBUtils; SiT5QJe
import java.sql.*; J~5+=V7OV
/** |+aD%'|
* IOH6h=
* @author /|[%~`?BM
*/ tfd!;` B
public class CountControl{ %T~LK=m
private static long lastExecuteTime=0;//上次更新时间 +?C7(-U>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8wzQr2:
/** Creates a new instance of CountThread */ wgKM6?
public CountControl() {} V_H0z
public synchronized void executeUpdate(){ frbeCBP&)
Connection conn=null; k{+Gv}Y
PreparedStatement ps=null; 5G WC
try{ [mG:PTK3
conn = DBUtils.getConnection(); ' "o2;J)7
conn.setAutoCommit(false); 24d{ol)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2PVQSwW:
for(int i=0;i<CountCache.list.size();i++){ esHcE{GNOS
CountBean cb=(CountBean)CountCache.list.getFirst(); TZE;$:1vx>
CountCache.list.removeFirst(); +(o]E3
ps.setInt(1, cb.getCountId()); Vs&Ul6@N
ps.executeUpdate();⑴
.v#Tj|w^
//ps.addBatch();⑵ E"t79dD
} 2!6-+]tC
//int [] counts = ps.executeBatch();⑶ ]=sGLd^)E
conn.commit(); RjG=RfB'V
}catch(Exception e){ /8s>JPXKH[
e.printStackTrace(); KA]5tVQA
} finally{ qfB!)Y
try{ Vg1MA
if(ps!=null) { d)v'K5
ps.clearParameters();
MVe4[<
ps.close(); \yA*)X+
ps=null; SQI =D8
} {'q(a4
}catch(SQLException e){} -ob1_0
DBUtils.closeConnection(conn); JA6#qlylL
} t;)`+K#1:
} ,gn**E
public long getLast(){ 1H7bPl|
return lastExecuteTime; 690;\O '
} :3 By7BZgj
public void run(){ 'FmnlC1
long now = System.currentTimeMillis(); 6kHb*L Je
if ((now - lastExecuteTime) > executeSep) { #s|/5[i
//System.out.print("lastExecuteTime:"+lastExecuteTime); FDIOST !
//System.out.print(" now:"+now+"\n"); Gbc2\A\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 0D^c4[Y'l
lastExecuteTime=now; kk7M$)>d
executeUpdate(); [X'u={
} \={A%pA;@{
else{ U
jB5Xks
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ZD`0(CkXb
} 0^zp*u
} G}gmkp]z
} H!uq5`j0K
//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 kZH IzU
Nmu=p~f}3`
类写好了,下面是在JSP中如下调用。 ,~qjL|9
)W$@phY(I
<% g7<u eF
CountBean cb=new CountBean(); #(Ezt% ^
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {&s.* 5
CountCache.add(cb); ?M@ff0
out.print(CountCache.list.size()+"<br>"); DeRC_ [
CountControl c=new CountControl(); -!pg1w06
c.run(); 3`DwKv`+
out.print(CountCache.list.size()+"<br>"); x_BnWFP
%>