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: ^*~u4app
o_+Qer=O6
CountBean.java Vy"^]5
!(AFT!
/* MvwJ(3
* CountData.java K OHH74}_
* s 17gi,"X
* Created on 2007年1月1日, 下午4:44
K`Zb;R
X
* YVV $g-D}
* To change this template, choose Tools | Options and locate the template under
NGD2z.
* the Source Creation and Management node. Right-click the template and choose 5oy MR_yl
* Open. You can then make changes to the template in the Source Editor. xI),0db
*/ &7nfTc
5|={1Lp24g
package com.tot.count; 0'2{[xF
:1
/** P VW9iT+c
* hl~F1"q)
* @author `-`iS?
*/ i(;u6Rk
public class CountBean { |>V>6%>vK6
private String countType; u5B/Em7,0
int countId; ZpBH;{.,
/** Creates a new instance of CountData */ !oRm.cO
public CountBean() {} D`ge3f8Wi
public void setCountType(String countTypes){ =ZL}Av}
this.countType=countTypes; DG
FvRB
} <^Nj~+G'
public void setCountId(int countIds){ ?{Z0g+B1
this.countId=countIds; {Ag}P0%'
} P`v~L;f
public String getCountType(){ H ?:#Ui(p
return countType; 8WQ%rN={8
} SJr:
public int getCountId(){ 90v18k
return countId; O
lIH0
} 6df&B
.gg
} f__WnW5h
r1?FH2Ns
CountCache.java Qz$Dv@*y\
FDC{8e
/* 0'oT {iN
* CountCache.java K:Go%3~,
* *F&&rsb
* Created on 2007年1月1日, 下午5:01 +Y[+2=lO
* ?pY!sG
* To change this template, choose Tools | Options and locate the template under ==r|]~x
* the Source Creation and Management node. Right-click the template and choose p&M'DMj+
* Open. You can then make changes to the template in the Source Editor. -$ft `Ih
*/ ^( VB5p
^$
bhmJYT
package com.tot.count; 9\0 K%LL
import java.util.*; ;z=C]kI6M
/** \Y 4Z Q"0Q
* X'4
Yofs
* @author ]V("^.~$+C
*/ RN|..zml
public class CountCache { VMXXBa&
public static LinkedList list=new LinkedList(); pa73`Ca]
/** Creates a new instance of CountCache */ 1uQf}
public CountCache() {} H)+kN'J
public static void add(CountBean cb){ m%\[1|N
if(cb!=null){ JH;DVPX9z
list.add(cb); <\mc|p"
} _Q}z 6+_\
} |O2PcYNu
} }d]8fHG
jU~%5R
CountControl.java KYW1<Wcp
Q~{@3<yEI
/* F'*&-l
* CountThread.java {`zF{AW8q
* $O-, :<HY
* Created on 2007年1月1日, 下午4:57 { "c,P:S]
* __c_JU
* To change this template, choose Tools | Options and locate the template under #OTsD+2Za=
* the Source Creation and Management node. Right-click the template and choose o>tT!8rH
* Open. You can then make changes to the template in the Source Editor. t1^96@m^
*/ &Hxr3[+$
*p!dd?8
package com.tot.count; Z`KmH.l!
import tot.db.DBUtils; ~.PYS!" +
import java.sql.*; SLo/7$rct
/** YR.'JF`C
* S7Fxb+{6D
* @author #"JU39e
*/ Q[KR,k
public class CountControl{ =SnR9In
private static long lastExecuteTime=0;//上次更新时间 &O)mPnx`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ,oe{@z{*@
/** Creates a new instance of CountThread */ PEl]HI_H
public CountControl() {} 7A-rF U$
public synchronized void executeUpdate(){ B E)l77=/
Connection conn=null; t_Wn<)XA
PreparedStatement ps=null; o3kj7U:'x
try{ 20)Il:x
conn = DBUtils.getConnection(); #!Fs[A5%
conn.setAutoCommit(false); [\yI<^_a
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); d:''qgz`
for(int i=0;i<CountCache.list.size();i++){ =1qkoc~
CountBean cb=(CountBean)CountCache.list.getFirst(); [_-K
CountCache.list.removeFirst(); MzG.Qh'z
ps.setInt(1, cb.getCountId()); kv b-=
ps.executeUpdate();⑴ 0k 8SDRWU
//ps.addBatch();⑵ $z]l4Hj
} +pm8;&
//int [] counts = ps.executeBatch();⑶ F o6U"
conn.commit(); vGw}e&YI
}catch(Exception e){
p]oo^
e.printStackTrace(); m+"%Jd{q
} finally{ jw[`\h}8
try{ b1cd5
if(ps!=null) { 1P_bG47
ps.clearParameters(); 5
S&>9l
ps.close(); y;jyfc$
`
ps=null; <-pbLL 9
} '5--eYG
}catch(SQLException e){} 5KSsRq/8"
DBUtils.closeConnection(conn); IuF-bxA
} @Q!j7I
} :u0433z:
public long getLast(){ =I1@ O9}+i
return lastExecuteTime; jp]JFh;3
} AtOB'=ph*
public void run(){ < lrw7 T
long now = System.currentTimeMillis(); RT>3\qhZ
if ((now - lastExecuteTime) > executeSep) { !@X#{
//System.out.print("lastExecuteTime:"+lastExecuteTime); o_n.,=/cZ
//System.out.print(" now:"+now+"\n"); yw0uF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ?`>yl4
lastExecuteTime=now; w[ngkLEA
executeUpdate(); 5;l_-0=
} DI7trR`
else{ E
\RU[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); <]nI)W(
} y=Hl ~ev`9
} ($TxVFNT
} D 4wB
&~U
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 2H#vA
/MC\!,K
类写好了,下面是在JSP中如下调用。 tWFJx}H
"$&F]0
<% "<WSEs
CountBean cb=new CountBean(); 2h!3[{M\
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ?H`LrL/k
CountCache.add(cb); V1G]LM
out.print(CountCache.list.size()+"<br>"); !QovpO">z
CountControl c=new CountControl(); )94R\f
c.run(); r%m2$vx#
out.print(CountCache.list.size()+"<br>"); 2i)y'+s
%>