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: k9;^|Cm
k
3OZPy|".ax
CountBean.java _?I{>:!|
cl%+m
/* C}RO'_Pq
* CountData.java 3x0t[{l
* IFp%Ta
* Created on 2007年1月1日, 下午4:44 h= sNj
* 5 aA*
~\
* To change this template, choose Tools | Options and locate the template under hGz_F/
* the Source Creation and Management node. Right-click the template and choose Cf2WBX$
* Open. You can then make changes to the template in the Source Editor. \EySKQ=
*/ C1k< P
=:^aBN#
package com.tot.count; L"m^LyU
QJVbt
/**
}~/b%^
* Dw%'u'HG
* @author 43PLURay
*/ !ajBZ>Q
public class CountBean { `5IrV&a
private String countType; i41~-?Bc
int countId; OM*c7&
/** Creates a new instance of CountData */ y?<KN0j
public CountBean() {} %y6(+I#P
public void setCountType(String countTypes){ Qq<@;4
this.countType=countTypes; gc.Lh~
} &J>e;X
public void setCountId(int countIds){ N*o{BboK;
this.countId=countIds; UZyg_G6
} q!ZM Wg
public String getCountType(){ |58HPW9
return countType; @Vre)OrN#
}
QrYF Lh
public int getCountId(){ <q'l7S
return countId; }5;4'l8
} f+h\RE=BGt
} ,CfslhO{j
V*giF`gq
CountCache.java Q/+`9z+c
MuoE~K2
/*
<\^0!v
* CountCache.java [eX]x
* rAH!%~
* Created on 2007年1月1日, 下午5:01 bhqSqU}6~
* yQK{ +w
* To change this template, choose Tools | Options and locate the template under tVAi0`DV
* the Source Creation and Management node. Right-click the template and choose heVkCM :
* Open. You can then make changes to the template in the Source Editor. 'ToE Y3
*/ y [8;mCh
D'g,<-ahl
package com.tot.count; : ky`)F`
import java.util.*; wjA
wJOw|
/** !T{+s
T
* QyD0WC}i
* @author t6DSZ^Zq
*/ +>Wo:kp3
public class CountCache { K-0=#6?y4
public static LinkedList list=new LinkedList(); VdlT+'HF
/** Creates a new instance of CountCache */ eZ$7VWG#
public CountCache() {} mmTpF]t
?`
public static void add(CountBean cb){ 7Sx|n}a-3
if(cb!=null){ z'YWomfZm
list.add(cb); :@(('X(".
} gP2zDI
} hd3
} aM}9ZurI
V8^la'_j
CountControl.java ~:ASv>m
FK _ ZE>
/* *w+'I*QSt~
* CountThread.java 2q~.,vpP
* \SWTP1
* Created on 2007年1月1日, 下午4:57 *uc/| c
* JrzPDb`m
* To change this template, choose Tools | Options and locate the template under PCviQ!X
* the Source Creation and Management node. Right-click the template and choose RM;a]g*
* Open. You can then make changes to the template in the Source Editor. g#5R||r
*/ }"D;?$R!
%?ElC
package com.tot.count; *~#I5s\s!
import tot.db.DBUtils; 2u3Kyn
import java.sql.*; K10G+'H^
/** h `Lr5)B'
* ;b<w'A_1
* @author '`>%RZ]
*/ 9@ k8$@
public class CountControl{ Cv**iW
private static long lastExecuteTime=0;//上次更新时间 g)Lf^
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 BEDkyz;:
/** Creates a new instance of CountThread */ yf&g\ke
public CountControl() {} Qg4D*r\|@
public synchronized void executeUpdate(){ y )QLR<wf
Connection conn=null; `YNzcn0x
PreparedStatement ps=null; &
l>nzJ5?
try{ {wqT$( (<
conn = DBUtils.getConnection(); bb6x} jR
conn.setAutoCommit(false); bMO^}qR`
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gv*b`cl
for(int i=0;i<CountCache.list.size();i++){ k@4N7}
CountBean cb=(CountBean)CountCache.list.getFirst(); }y(t')= 9
CountCache.list.removeFirst(); IW~R{ ]6
ps.setInt(1, cb.getCountId()); .j]tzX
ps.executeUpdate();⑴ j4$nr=d.6
//ps.addBatch();⑵ X +`Dg::
} Na0^csPm
//int [] counts = ps.executeBatch();⑶ fap`;AuwK
conn.commit(); r w?wi}}gn
}catch(Exception e){ $ L*gtZ
e.printStackTrace(); q0.!T0i
} finally{ cl& w/OJ#
try{ (i~UH04r>s
if(ps!=null) { \<7Bx[/D4
ps.clearParameters(); /Hr|u
ps.close(); B2;P%B
ps=null; `16'qc
} 1j?P$%p
}catch(SQLException e){} Y~"tL(WfJl
DBUtils.closeConnection(conn); gIB3DuUo
} P5Xp #pa
} $qNF /rF
public long getLast(){ .S
k+"iH5
return lastExecuteTime; %2QGbnt_*
} p{Lrv%-j
public void run(){ )z[C=
long now = System.currentTimeMillis(); CIW4E
if ((now - lastExecuteTime) > executeSep) { Nq8ON!<<
//System.out.print("lastExecuteTime:"+lastExecuteTime); E7X6RB b
//System.out.print(" now:"+now+"\n"); S;~eI8gQ"
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); NI?O
lastExecuteTime=now; 0L}`fYf
executeUpdate(); )D8op;Fn
} WtOjPW
else{ XGa8tI[:X
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Z(MZbzY7Hq
} `OW'AS |
} 9Yt|Wj
} ,rB(WKU
//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 4C;;V m4~
6z\!lOVjb
类写好了,下面是在JSP中如下调用。 $kUB%\`
AiHU*dp6
<% \K$\-]N+
CountBean cb=new CountBean(); EyK!'9~a
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ![z2]L+TB
CountCache.add(cb); e{x>u(
out.print(CountCache.list.size()+"<br>"); }qWnn>h9xv
CountControl c=new CountControl(); c=v016r\
c.run(); }a" =K%b<\
out.print(CountCache.list.size()+"<br>"); Ii0\Skb
%>