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: >8"oO[U5>
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CountBean.java j\B]>PP5
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/* d(3F:dbk
* CountData.java X* KQWs.
* X|TEeE c[L
* Created on 2007年1月1日, 下午4:44 9TIyY`2!
* ,^pM]+NF|
* To change this template, choose Tools | Options and locate the template under %[u6<
* the Source Creation and Management node. Right-click the template and choose Kyt.[" p
* Open. You can then make changes to the template in the Source Editor. !hrXud=#"
*/ 9%S{fd\#
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package com.tot.count; : ^F+mQN
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/** 5|my}.TR
* J;W(}"cFq
* @author ?l!L
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*/ ig4wwd@|
public class CountBean { %0fF_OU
private String countType; r Lg(J|^
int countId; vIF=kKl9,
/** Creates a new instance of CountData */ Sf);j0G,D
public CountBean() {} w17\ \[
public void setCountType(String countTypes){ F[<EXLQ
this.countType=countTypes; Y9Q-<~\z
} SpPG
public void setCountId(int countIds){ an_qE}P
this.countId=countIds; Jkzt=6WZ0
} L$=@j_V2
public String getCountType(){ ]( V+ qj
return countType; [ R+zzl&Zw
} r(y1^S9!8
public int getCountId(){ !rZO~a0
return countId; |R8=yO%(
} (~:k70V5
} T]Gxf"mK
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CountCache.java x%23oPM
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/* 3$ cDC8
* CountCache.java =2] .G Gg
* dB+x,+%u+
* Created on 2007年1月1日, 下午5:01 ?VrZM
* r5jiB L~
* To change this template, choose Tools | Options and locate the template under Y]/(R"-2G
* the Source Creation and Management node. Right-click the template and choose v_)a=I%o&2
* Open. You can then make changes to the template in the Source Editor. IMIZ#/
*/ +-&N<U
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package com.tot.count; ?Z0T9e<
import java.util.*; /=w9bUj5v
/** 9_h3<3e
* 5!$m3j_,]?
* @author O{ zY(`[
*/ C7[ge&
public class CountCache { jCDZ$W89
public static LinkedList list=new LinkedList(); MH[Zw$
/** Creates a new instance of CountCache */ C9E l {f
public CountCache() {} %y)5:]
public static void add(CountBean cb){ zWoPa,
if(cb!=null){ [_hHZMTH
list.add(cb); @qmONQ eb
} 9r-]@6;
} TC[_Ip&
} lTJ1]7)
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CountControl.java ePdM9%
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/* eZ5UR014
* CountThread.java 0@d )DLM?
* xx0s`5
* Created on 2007年1月1日, 下午4:57 [hTGWT3
* lc>)7UF
* To change this template, choose Tools | Options and locate the template under A`Q'I$fj
* the Source Creation and Management node. Right-click the template and choose Qmle0ae
* Open. You can then make changes to the template in the Source Editor. Uhfm@1 cz&
*/ 'bGL@H
Zq=t&$*
package com.tot.count; Ug_5INK
import tot.db.DBUtils; yn<H^c
import java.sql.*; !-b4@=f:
/** ,cPNZ-%
* rLs)*A!
* @author xnmIo?
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*/ Oe4 l`
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public class CountControl{ J;h4)w~9H3
private static long lastExecuteTime=0;//上次更新时间 Z]D O
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [RCUP.
/** Creates a new instance of CountThread */ Gc>bli<-
public CountControl() {} ez=$ ]cln
public synchronized void executeUpdate(){ 5%"${ywI
Connection conn=null; ?z% @;&
PreparedStatement ps=null; /tl/%:U*.
try{ 1RM;"b/
conn = DBUtils.getConnection(); s,m+q)
conn.setAutoCommit(false); Yq}7x1mm
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [H;HrwM
s)
for(int i=0;i<CountCache.list.size();i++){ TWYz\Hmw
CountBean cb=(CountBean)CountCache.list.getFirst(); e`zEsLs@
CountCache.list.removeFirst(); 3dfG_a61y
ps.setInt(1, cb.getCountId()); -Bbg'=QZa
ps.executeUpdate();⑴ t5mI)u
//ps.addBatch();⑵ vK6YU9W~J
} .Gq.s t%
//int [] counts = ps.executeBatch();⑶ Os^ sOOSY
conn.commit(); Cbm
}catch(Exception e){ 9)0AwLlv
e.printStackTrace(); : Q X~bq
} finally{ Qw4P{>|Y
try{ ^I3cU'X
if(ps!=null) { UMwB. *
ps.clearParameters(); @%&;V(
ps.close(); r/1:!Vu(
ps=null; gS4zX>rqe
} A`<#}~A
}catch(SQLException e){} .o91^jt
DBUtils.closeConnection(conn); mbxJS_P
} s<gZB:~
} *@o@>
public long getLast(){ 7Ipt~K}
return lastExecuteTime; 0}Rxe
} \]GO*]CaV
public void run(){ B!GpD@U
long now = System.currentTimeMillis(); H+vONg
if ((now - lastExecuteTime) > executeSep) { i$;GEM}tv
//System.out.print("lastExecuteTime:"+lastExecuteTime); 8^M5k%P
//System.out.print(" now:"+now+"\n"); x%d+~U;$&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pw{3I 2Ix
lastExecuteTime=now; _F>1b16:/P
executeUpdate(); /Y5I0Ko Uw
} ,{:c<W:A]
else{ 7IW:,=Zk8+
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ;'l Hw]}O*
} EJ{Z0R{{
} Ze~$by|9f
} B+S
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 5w"f.d'
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类写好了,下面是在JSP中如下调用。 uMa: GDh7
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<% `GOxFDB.
CountBean cb=new CountBean(); 6g4CUP'Y
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ;KJJK#j
CountCache.add(cb); { 6Lkh
out.print(CountCache.list.size()+"<br>"); [:sP Z{
CountControl c=new CountControl(); %y.9S=,v,
c.run(); &;L4Cj$q
out.print(CountCache.list.size()+"<br>"); 1)(p=<$
%>