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: wOQ-sp0q0
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CountBean.java ^~}|X%q3
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/* .CH0PK=l
* CountData.java ;K 38I}
* &RP!9{F<
* Created on 2007年1月1日, 下午4:44 LcCb[r
* }ny,Nl
* To change this template, choose Tools | Options and locate the template under L'=2Uk#.D
* the Source Creation and Management node. Right-click the template and choose ?P4@U9i
* Open. You can then make changes to the template in the Source Editor. -IhFPjQ
*/ $~c?qU
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package com.tot.count; x'*,~u
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/** \ &1)k/
* [z#C&gDt
* @author vr56
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*/ JG&`l{c9
public class CountBean { *u.6,jw
private String countType; Wh[+cH"M
int countId; Z0T{1YEJ
/** Creates a new instance of CountData */ yZ3/Ia>,
public CountBean() {} /=Bz[O
public void setCountType(String countTypes){ <y5V],-U
this.countType=countTypes; X.<_TBos|
} b2c% 0C
public void setCountId(int countIds){ Ry*NRP;
this.countId=countIds; -}|GkTM
} OD<0,r0f,
public String getCountType(){ ?l#9ydi?
return countType; /9dV!u!;
} +4^XFPq~
public int getCountId(){ /!ZeMY:x
return countId; ,?i^i#Wqzg
} ~d6_
} JoQzf~
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CountCache.java 6W$ #`N>
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/* -'+|r]
* CountCache.java eCdx(4(\a
* @
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* Created on 2007年1月1日, 下午5:01 fVv#|
* }CZ,WJz=
* To change this template, choose Tools | Options and locate the template under UN_f2
* the Source Creation and Management node. Right-click the template and choose Gxfw!aF~
* Open. You can then make changes to the template in the Source Editor. TN3, \qgV
*/ T.="a2iS2
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package com.tot.count; K[)N/Q
import java.util.*; nW+rJ
/** :7%JD .;W
* 6"Q/Y[y
* @author ,
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*/ &3v{~Xg)
public class CountCache { L^rtypkJ
public static LinkedList list=new LinkedList(); u.iFlU
/** Creates a new instance of CountCache */ +kTAOfM
public CountCache() {} ,pir,Eozg
public static void add(CountBean cb){ .E!7}O6
if(cb!=null){ )a,-Hc:Vz
list.add(cb); jzV*V<
} >U~.I2sz
} "{;]T
} AWCzu5ve
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CountControl.java Ne*I$T 5
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/* bT-(lIU
* CountThread.java J]ivIQ
* |#R;pEn
* Created on 2007年1月1日, 下午4:57 DrbjqQL+.
* =N01!?{
* To change this template, choose Tools | Options and locate the template under ~!~VC)a*
* the Source Creation and Management node. Right-click the template and choose A$ %5l
* Open. You can then make changes to the template in the Source Editor. G;615p1
*/ @va{&i`%A7
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package com.tot.count; ?6Cbx6
import tot.db.DBUtils; uoFH{.)
import java.sql.*; #/sKb2eQ
/** u,[Yaw"L
* |GE3.g
* @author jo=XxA
*/ y=YD4m2 W
public class CountControl{ &Th/Qv}[
private static long lastExecuteTime=0;//上次更新时间 &5/`6-K
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 g#`(&
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/** Creates a new instance of CountThread */ qRsPi0;
public CountControl() {} Q6Q>b4 .3
public synchronized void executeUpdate(){ R6dw#;6{I
Connection conn=null; =%Gecj
PreparedStatement ps=null; * b>W
try{ R?1;'pvpa[
conn = DBUtils.getConnection(); X obiF
conn.setAutoCommit(false); Tz58@VY V
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); `ea;qWy
for(int i=0;i<CountCache.list.size();i++){ i:OD)l
CountBean cb=(CountBean)CountCache.list.getFirst(); G,>tC`!
CountCache.list.removeFirst(); tr7FV1p
ps.setInt(1, cb.getCountId()); z_!P0`
ps.executeUpdate();⑴ 8<3J!X+
//ps.addBatch();⑵ _Pa(5-S'KR
} D9e"E1f+"
//int [] counts = ps.executeBatch();⑶ e%x$Cb:znn
conn.commit(); 0sVCTJ@
}catch(Exception e){ zm2&\8J
e.printStackTrace(); #QZg{
} finally{ Eag->mw/~
try{ KJ,{w?p~
)
if(ps!=null) { S +|aCRS
ps.clearParameters(); J5k\R+\H
ps.close(); eOy{]<l3
ps=null; KQ?E]}rZ
} 9cFFQM|o
}catch(SQLException e){} IkH]W!_+
DBUtils.closeConnection(conn); aMuc]Wy#
} :<gmgI
} .Xo, BEjE/
public long getLast(){ ywmx6q4MFL
return lastExecuteTime; N4!YaQQ;}
} 7u,56V?X
public void run(){ 3nd02:GF
long now = System.currentTimeMillis(); -`]B4Nt6
if ((now - lastExecuteTime) > executeSep) { ]jG%<j9A
//System.out.print("lastExecuteTime:"+lastExecuteTime); W5$jIQ}Bw
//System.out.print(" now:"+now+"\n"); Z4}Yw{=f
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Y[$[0
lastExecuteTime=now; RmO-".$yt
executeUpdate(); wGd8q xa
} R_uA!MoLs
else{ {~16j"
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {i~qm4+o
} v;el= D
} INW8Q`[F
} ,f$A5RN
//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 Qz{:m
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类写好了,下面是在JSP中如下调用。 Xo(K*eIN
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<% WXNJc
CountBean cb=new CountBean(); nfy"M),et
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 8_U*_I7(
CountCache.add(cb); dSsMa3X[n
out.print(CountCache.list.size()+"<br>"); zi2hi9A
CountControl c=new CountControl(); #E5#{bra
c.run(); Vj0`*nC)/
out.print(CountCache.list.size()+"<br>"); $b\Gl=YX^
%>