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: -ifFbT+x
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CountBean.java ]Wlco
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/* @>2i+)=E5
* CountData.java a fW@T2
* m'=Crei
* Created on 2007年1月1日, 下午4:44 e)?
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* y'nK>)WG4
* To change this template, choose Tools | Options and locate the template under E,x+JeKV
* the Source Creation and Management node. Right-click the template and choose (m(JK^
* Open. You can then make changes to the template in the Source Editor.
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*/ ag;pN*z
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package com.tot.count; 9`X\6s
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/** >rmqBDKaQ
* ZdWm:(nkU
* @author bUdLs.:
*/ Q1I6$8:7
public class CountBean { x}I+Iggi
private String countType; J$w<$5UY
int countId; C]`$AqKl
/** Creates a new instance of CountData */ qvKG-|j
public CountBean() {} z3m85F%dR
public void setCountType(String countTypes){ WUXx;9 >
this.countType=countTypes; o&)8o5
} Z4w!p?Wqa
public void setCountId(int countIds){ 6@F9G4<Z
this.countId=countIds; sW'AjI
} dhf!o0'1M
public String getCountType(){ u5b|#&-mX
return countType; Y>dzR)~3[
} h#
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public int getCountId(){ g63(E,;;J
return countId; XZ]uUP
} vDhh>x(
} B:S>wFE(.
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CountCache.java }t=!(GOb}
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/* b)5uf'?-
* CountCache.java P90yI
*
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* Created on 2007年1月1日, 下午5:01 S8wLmd>
* IT7wT+
* To change this template, choose Tools | Options and locate the template under J~zUp(>K
* the Source Creation and Management node. Right-click the template and choose */^q{PsN
* Open. You can then make changes to the template in the Source Editor. ;dtA4:IRZ4
*/ %XoiVlT@:
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package com.tot.count; *-=(Q`3
import java.util.*; mt+Oi70
/** 7yH"l9Z
* }1c|gQ
* @author PI:4m%[
*/ e L^|v
public class CountCache { )D5"ap]fX
public static LinkedList list=new LinkedList(); $m{:C;UH
/** Creates a new instance of CountCache */ vzs)[AD
public CountCache() {} 8f)?{AX0
public static void add(CountBean cb){ Fg5kX
if(cb!=null){ 0$)>D==
list.add(cb); 6azGhxh
} {JO
} 7cT~oV !G_
} p{Yv3dNl
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CountControl.java "fCu=@i
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/* k"T}2 7
* CountThread.java rJT^H5!o"
* Bs_s&a>
* Created on 2007年1月1日, 下午4:57 :bu/^mW[
* P}y +G|
* To change this template, choose Tools | Options and locate the template under +>Qq(Y
* the Source Creation and Management node. Right-click the template and choose 0w\zLU
* Open. You can then make changes to the template in the Source Editor. %S@ZXf~:
*/ \K{0L
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package com.tot.count; vv3*
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import tot.db.DBUtils; 0d"[l@UU0
import java.sql.*; &0OG*}gi
/** J!v3i*j\
* "3)C'WlEy/
* @author 0neoE
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*/ i&Tbz!
public class CountControl{ |+FubYf?$
private static long lastExecuteTime=0;//上次更新时间 ~q@|l3?$
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3LJ+v5T~
/** Creates a new instance of CountThread */ j^j1
public CountControl() {} hYT0l$Ng
public synchronized void executeUpdate(){ W#4 7h7M
Connection conn=null; @; zl
PreparedStatement ps=null; w;[NH/A^a
try{ fNli
conn = DBUtils.getConnection(); '8RsN-w
conn.setAutoCommit(false); zU kgG61
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); dUeN*Nq&(,
for(int i=0;i<CountCache.list.size();i++){ )BZ.Sv
CountBean cb=(CountBean)CountCache.list.getFirst(); KQaxvU)L
CountCache.list.removeFirst(); @w#-aGJO
ps.setInt(1, cb.getCountId()); q1$N>;&
ps.executeUpdate();⑴ p*R;hU
//ps.addBatch();⑵ uB]7G0g:
} $<dH?%!7
//int [] counts = ps.executeBatch();⑶ 25nt14Y0u
conn.commit(); 67JA=,EE
}catch(Exception e){ 1b `1{%
e.printStackTrace(); ~ drS} V
} finally{ zH?!
try{ VuhGx:Xl
if(ps!=null) { knu,"<
ps.clearParameters(); NR5gj-B[
ps.close(); &Cq`Y !y
ps=null; q 6:dy
} nMq,F#`3N
}catch(SQLException e){} 'Vzp2
DBUtils.closeConnection(conn); fIx+ILs
} GfxZ'VIn
} 9|^2",V
public long getLast(){ >a!/QMh
return lastExecuteTime; )#0O>F~
} >Eyt17_H"n
public void run(){ Q04al=
long now = System.currentTimeMillis(); :)-Sk$
if ((now - lastExecuteTime) > executeSep) { er("wtM
//System.out.print("lastExecuteTime:"+lastExecuteTime); .KB^3pOpx
//System.out.print(" now:"+now+"\n"); 2@n{yYwy
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); [`#CXq'
lastExecuteTime=now; O%WIf__Q
executeUpdate(); 1![!+X:w
} dc+>m,3$
else{ !fV+z%:
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Avge eJi
} O W_{$9U
} IA fcT!{
} 1*P~!2h
//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 .wEd"A&j
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类写好了,下面是在JSP中如下调用。 SXSgld2uS
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<% a=|K%ii+Y
CountBean cb=new CountBean(); j2t7'bO_
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ,Q3T
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CountCache.add(cb); WA<v9#m
out.print(CountCache.list.size()+"<br>"); ]g#: KAqz
CountControl c=new CountControl(); euK5pA>L
c.run(); e[{0)y>=
out.print(CountCache.list.size()+"<br>"); >2Y=*K,:
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