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: G;he:Bf
yBkcYHT
CountBean.java 3](At%ss
%n)H(QPW
/* 5KgAY;|
* CountData.java @O9wit.
* Qr9@e Q1Pp
* Created on 2007年1月1日, 下午4:44 q5#6PYIq
* =x3T+)qCNX
* To change this template, choose Tools | Options and locate the template under ';zS0Yk
* the Source Creation and Management node. Right-click the template and choose PFI^+';
* Open. You can then make changes to the template in the Source Editor. &1Cif$Y4w
*/ sDl@
7?"-:q
package com.tot.count; zJH:`~GxE
tb/`*Yl@
/** 9(pF!}1%\
* }P\ J?8
* @author kHz?vVE/l
*/ BG^)?_69
public class CountBean { =k\Qx),Ir
private String countType; y"Ios:v@-
int countId; %v)+]Ds{
/** Creates a new instance of CountData */ {&uN q^Ch
public CountBean() {} ap wA
public void setCountType(String countTypes){ +N2R'Phv
this.countType=countTypes; `b*x}HP$
} M~l\rg8
public void setCountId(int countIds){ 0WQd#l
this.countId=countIds; 7 0Wy]8<P
} ?%ei+
public String getCountType(){ Y.KJP ?
return countType; h pKrP
} <V1y^EW0
public int getCountId(){ <[A;i
return countId; ZKF
#(G
} -GODM128 ^
} ]FEsN6
[vn"r^P
CountCache.java WXFCe@
3eN(Sw@p
/* <RCeY(1
* CountCache.java AsO)BeUD
* 7bL48W<QD
* Created on 2007年1月1日, 下午5:01 Q`!<2i;
* zb. ^p
X
* To change this template, choose Tools | Options and locate the template under 1
&-%<o
* the Source Creation and Management node. Right-click the template and choose %@^9(xTE
* Open. You can then make changes to the template in the Source Editor. Pf#DBW*
*/ q'KXn0IY#
,% *Jm
package com.tot.count; yC\!6pg
import java.util.*; C:ntr=3J
/** ]zh6[0V7V
* Yv"-_
* @author d~;U-
*/ 1EQLsg`d^
public class CountCache { ZsN3 MbY
public static LinkedList list=new LinkedList(); M5c
*vs
/** Creates a new instance of CountCache */
U92?e}=]
public CountCache() {} sNs Hl
public static void add(CountBean cb){ 4XNkto
if(cb!=null){ seiE2F[
list.add(cb); `teaE7^Wm
} %ZTI ?a
} ?6 _U>d{
} pGP$2
\4Z"s[8}
CountControl.java %o_CD>yD
DAQozhP8
/* "O<TNSbrC
* CountThread.java !m?W+z~J
* cv9-ZOxJ
* Created on 2007年1月1日, 下午4:57 Xp~O?2:3l
* +^3
*Y"6Z
* To change this template, choose Tools | Options and locate the template under )NnkoCNeE
* the Source Creation and Management node. Right-click the template and choose DEt;$>tl
5
* Open. You can then make changes to the template in the Source Editor. "#]V^Rzxh
*/ So]O`RJv
\:>eZl?
package com.tot.count; r<pt_Cd
import tot.db.DBUtils; XL`i9kV?
import java.sql.*; @!mjjeG+1
/** kY#sQz}8
* <ELqj2`c
* @author O6]X\Cwj%
*/ dF'oZQz
public class CountControl{ ~`<_xIvrq
private static long lastExecuteTime=0;//上次更新时间 23'Ac,{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Bi|-KS.9
/** Creates a new instance of CountThread */ E[M.q;rM
public CountControl() {} G$1gk ^G's
public synchronized void executeUpdate(){ 5](,N^u{):
Connection conn=null; #Kt5+"+7
PreparedStatement ps=null; v7mg8'
try{ uZ+vYF^
conn = DBUtils.getConnection(); BV
eIj }
conn.setAutoCommit(false); gPF5|% 3)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); hEAP,)>F
for(int i=0;i<CountCache.list.size();i++){ )]{&
CountBean cb=(CountBean)CountCache.list.getFirst(); Q#}c5TjVr
CountCache.list.removeFirst(); $}.#0c8I
ps.setInt(1, cb.getCountId()); '
eH Fa
ps.executeUpdate();⑴ M4K>/-9X+V
//ps.addBatch();⑵ NLZUAtx(
} M9/J!s
//int [] counts = ps.executeBatch();⑶ p1fy)K2{,j
conn.commit(); ]Ab$IKY
}catch(Exception e){ g>H\"cUv
e.printStackTrace(); X_#,5t=7
} finally{ "2GssBa
try{ pF7S("#R
if(ps!=null) { E[tEW0ub
ps.clearParameters(); #$v,. Yk
ps.close(); yOE N*^6
ps=null; >qci$
} 54%h)dLDy
}catch(SQLException e){} /igbn
DBUtils.closeConnection(conn); A#CG D0T
} xcC^9BAj
} 7jYW3
public long getLast(){ :+UahwiRD"
return lastExecuteTime; HfA@tZ5q|U
} :{x
public void run(){ H)NT2@%{P
long now = System.currentTimeMillis(); T@j@IEGH
if ((now - lastExecuteTime) > executeSep) { hA387?
//System.out.print("lastExecuteTime:"+lastExecuteTime); Jl{g"N{2u'
//System.out.print(" now:"+now+"\n"); e'&<DE)
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Pql;5
~/
lastExecuteTime=now; RaAvPIJa |
executeUpdate(); 8~v E
} k[/`G5
else{ v:u=.by99
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ThYHVJ[;
} CChCxB
} ePe/@g1K*
} "U
iv[8B
//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 \-RVPa8k
kcZz WG|n
类写好了,下面是在JSP中如下调用。 5
DvD
}+BbwBm&
<% z?Qt%1q
CountBean cb=new CountBean(); P*{*^DN
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 9+co`t.
CountCache.add(cb); l5l#LsaQb
out.print(CountCache.list.size()+"<br>"); jfsbvak
CountControl c=new CountControl(); UYsyVY`Fm|
c.run(); |H4f&&Wd
out.print(CountCache.list.size()+"<br>"); Uf<IXx&;
%>