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: j }^?Snq
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CountBean.java &e[Lb:Uk)
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/* :1iXBG\
* CountData.java $3#oA.~R/
* z5:3.+M5
* Created on 2007年1月1日, 下午4:44 OB,T>o@
* F+xMXBD@>*
* To change this template, choose Tools | Options and locate the template under 3_VWtGQ
* the Source Creation and Management node. Right-click the template and choose #2.C$
* Open. You can then make changes to the template in the Source Editor. %ULd_ES^
*/ 1d.>?^uE
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package com.tot.count; =g@hh)3wP
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/** &E
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*
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* @author 9qZ|=r]y'
*/ v g tJ+GjN
public class CountBean { d<;XQ.Wo7
private String countType; 6d 8n1_
int countId; L?y,xA_
/** Creates a new instance of CountData */ T?5F0WKi
public CountBean() {} -H_7GVSnl
public void setCountType(String countTypes){ }% |GV
this.countType=countTypes; DNM~/Oo
} ] @1ncn7N
public void setCountId(int countIds){ Xg"Mjmr
this.countId=countIds; `Sj8<O}
} !lB,2_
public String getCountType(){ [c6_6q As
return countType; %}&9[#
}
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public int getCountId(){ t!Av[K
return countId; 8c$IsvJg
} 55|$Imnf
} ~yf 5$~Z
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CountCache.java 1r w>gR
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/* Bp6Evi
* CountCache.java zKWi9
* r*3XM{bZ/@
* Created on 2007年1月1日, 下午5:01 f%auz4CZz
* p-/x Md
* To change this template, choose Tools | Options and locate the template under ,|c_l)
* the Source Creation and Management node. Right-click the template and choose ?
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* Open. You can then make changes to the template in the Source Editor. Yc5$915
*/ KoXXNJax
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package com.tot.count; C,z]q$4
import java.util.*; ,!py
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/** y! 1NS
* `") I[h
* @author I5"=b}V5
*/ XAFTLNV>
public class CountCache { U&a]gkr
public static LinkedList list=new LinkedList(); BR%: `uiQ<
/** Creates a new instance of CountCache */ fu&]t8MJC
public CountCache() {} nW%c95E
public static void add(CountBean cb){ MR6vr.~
if(cb!=null){ %`\{Nxk
list.add(cb); Y\x
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} TP^0`L
} [)=FZF6kG
} Aws
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CountControl.java S {H8}m|MW
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/* Z~g qTB]H
* CountThread.java ~!OjdE!u
* &_6:TqJ
* Created on 2007年1月1日, 下午4:57 J.d `tiN
* kgu+q\?
* To change this template, choose Tools | Options and locate the template under HTG;'$H^
* the Source Creation and Management node. Right-click the template and choose G#C)]4[n
* Open. You can then make changes to the template in the Source Editor. s'^#[%EgB
*/ -d~'tti
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package com.tot.count; V]2z5u_q
import tot.db.DBUtils; ^b#E%Rd
import java.sql.*; 9+']`=a:
/** +1%6-g4"
* a*8}~p,
* @author {mQJ6
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*/ B+LNDnjO]
public class CountControl{ XTJ>y@
private static long lastExecuteTime=0;//上次更新时间 Y(f-e,
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 :KLD~k7yA(
/** Creates a new instance of CountThread */ @6SSk=9_S
public CountControl() {} ]lY9[~
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public synchronized void executeUpdate(){ *Y ZLQT
Connection conn=null; ihVQ,Cth
PreparedStatement ps=null; K/-D 5U
try{ $\
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conn = DBUtils.getConnection(); =.c"&,c?L
conn.setAutoCommit(false); Xn=fLb(
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I .ty-X]
for(int i=0;i<CountCache.list.size();i++){ 2'U9!.o
CountBean cb=(CountBean)CountCache.list.getFirst(); M)7enp) F.
CountCache.list.removeFirst(); h~p}08
ps.setInt(1, cb.getCountId()); s|T7)PgR
ps.executeUpdate();⑴ ]N_^{k,
//ps.addBatch();⑵ *zWn4BckN
} $ Zr,-
//int [] counts = ps.executeBatch();⑶ ,GIqRT4K
conn.commit(); }[`?#`sW
}catch(Exception e){ 6]S.1BP
e.printStackTrace(); d
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} finally{ X;:xGZ-oY
try{ Tt|6N*b'
if(ps!=null) { h :R)KM
ps.clearParameters(); beE%%C]X
ps.close(); Gu).*cU
ps=null; z%tu6_4j
} :\_MA^<
}catch(SQLException e){} ~*Qpv&y)
DBUtils.closeConnection(conn); bobkT|s^s
} ^E17_9?
} V&H8-,7z
public long getLast(){ eB*8)gYh
return lastExecuteTime; >iN%Uz
} iGLYM-
public void run(){ +hgCk87%#
long now = System.currentTimeMillis(); +=Wdn)T
if ((now - lastExecuteTime) > executeSep) { YWrY{6M
//System.out.print("lastExecuteTime:"+lastExecuteTime); :j<JZs>`R
//System.out.print(" now:"+now+"\n"); T(^8ki
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); t}*!UixE
lastExecuteTime=now; >:&p(eu)L0
executeUpdate(); T
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} 8 {%9%{
else{ [)>8z8'f
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
}92lr87
} '/g+;^_cB
} @(fY4]K
} `+c9m^
//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 %nf=[f
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类写好了,下面是在JSP中如下调用。 v=1S
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<% eh4"_t
CountBean cb=new CountBean(); XYF~Q9~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (Gc`3jJ
CountCache.add(cb); _kX/LR"L+
out.print(CountCache.list.size()+"<br>"); 1e&b;l'*=
CountControl c=new CountControl(); @ ]wem
c.run(); +{ !t~BW
out.print(CountCache.list.size()+"<br>"); <JM%Kn )
%>