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: 10C91/
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CountBean.java }4ju2K
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/* [<I
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* CountData.java zi&d
* g#2X'%&+
* Created on 2007年1月1日, 下午4:44 3jVm[c5%]
* p%y\`Nlgdx
* To change this template, choose Tools | Options and locate the template under !>);}J!e]
* the Source Creation and Management node. Right-click the template and choose 5K-)X9z?
* Open. You can then make changes to the template in the Source Editor. *M<=K.*\G
*/ ]<?)(xz
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package com.tot.count; &>b1ES.>
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/** ~0{Kga
* {!?RG\EYN
* @author pNWp3+a'
*/ IbaL.t\>
public class CountBean { _Cs}&Bic_
private String countType; T/6=A$4
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int countId; TmZ[?IL,
/** Creates a new instance of CountData */ 6(^9D_"@
public CountBean() {} w1G.^
public void setCountType(String countTypes){ diL l>z
this.countType=countTypes; lH>XIEj
} twS3J)UH
public void setCountId(int countIds){ 6N)1/=)
this.countId=countIds; :P1c>:j[
} meD (ja
public String getCountType(){ `v{X@ x
return countType; i*/U.'#
} OYy !4Fp
public int getCountId(){ 'U0I.x(
return countId; ng*E9Puu[
} A:J{
} Xkm2C)
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CountCache.java u@'zvkb@
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/* (:x"p{
* CountCache.java `R?W @,@'
* -B(K Q T,J
* Created on 2007年1月1日, 下午5:01 >D#}B1(!
* i?=.;
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* To change this template, choose Tools | Options and locate the template under rB?cm]G=
* the Source Creation and Management node. Right-click the template and choose iRtDZoiD'
* Open. You can then make changes to the template in the Source Editor. S:\hcW6
*/ B9-[wg#0G
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package com.tot.count; I,3!uogn
import java.util.*; r,KK%B
/** -y.AJ~T
* ~{Bi{aK2
* @author ^eRT8I
*/ 9Dw&b
public class CountCache { iCKwd 9?)
public static LinkedList list=new LinkedList();
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/** Creates a new instance of CountCache */ v|2j~
public CountCache() {} Cw5K*
public static void add(CountBean cb){ O3:
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if(cb!=null){ 2H "iN[2A
list.add(cb); ,quTMtk~
} 0Wm-`ZA
} S$WM&9U
} elB 8
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CountControl.java w5jZI|
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/* "6QMa,)D
* CountThread.java 1z:N$O_v
* )c !S@Hs
* Created on 2007年1月1日, 下午4:57 GA}^Rh`T-
* e6'O,\
* To change this template, choose Tools | Options and locate the template under TMsoQ82
* the Source Creation and Management node. Right-click the template and choose i8.[d5
* Open. You can then make changes to the template in the Source Editor. +cH(nZ*f
*/ 1D6O=j\
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package com.tot.count; oy: MM
import tot.db.DBUtils; 2&URIQg*J
import java.sql.*; ?Fpl.t~
/** 18`%WUPnT
* E%B Gf}h
* @author 3>Snd9Q
*/ %/zZ~WIf
public class CountControl{ xv l
private static long lastExecuteTime=0;//上次更新时间 efR$s{n!
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 NM.B=<Aw*
/** Creates a new instance of CountThread */ `1]9(xwhQ0
public CountControl() {} f tDV3If
public synchronized void executeUpdate(){ k;7.qhe:
Connection conn=null; >IjLFM+U
PreparedStatement ps=null; <LN $[&f#
try{ T%/w^27E
conn = DBUtils.getConnection(); hM w`e
conn.setAutoCommit(false); o+TZUMm
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J3;KQ}F.I
for(int i=0;i<CountCache.list.size();i++){ n.RhA-O
CountBean cb=(CountBean)CountCache.list.getFirst(); au*jMcq
CountCache.list.removeFirst(); 7!;/w;C
ps.setInt(1, cb.getCountId()); ^i\1c-/
ps.executeUpdate();⑴ *rT(dp!Y
//ps.addBatch();⑵ gwT,D.'Ut
} V0i$"|F+E
//int [] counts = ps.executeBatch();⑶ pN_!|+$
conn.commit(); [CX?Tt
}catch(Exception e){ &
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e.printStackTrace(); KL]!E ~i
} finally{ 'bPo 5V|
try{ =i?,y +<
if(ps!=null) { v19`7qgR(
ps.clearParameters(); 2zu~#qU[)M
ps.close(); wgrOW]e
ps=null; ArK9E!`^
} uD5yw#`
}catch(SQLException e){} wP?q5r5
DBUtils.closeConnection(conn); 1A-EP@# J
} #jiqRhm
} [rU8
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public long getLast(){ 89mre;v`
return lastExecuteTime; "~
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} @un
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public void run(){ 2"mj=}y6
long now = System.currentTimeMillis(); 8 GN{*Hg
if ((now - lastExecuteTime) > executeSep) { F9r*ZyNlx
//System.out.print("lastExecuteTime:"+lastExecuteTime); vy2aNUmt
//System.out.print(" now:"+now+"\n"); \-w s[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); V.:A'!$#
lastExecuteTime=now; Dj"=kL0
executeUpdate(); IxBO$2
} n4y6Ua9m{
else{ 4'&BpFDUb
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ><c5Humr
} HH@xnd
} }*
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} ped Yf{T
//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 yVzg<%CR^
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类写好了,下面是在JSP中如下调用。 7g+ ]
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dc>9\
<% vyGLn
CountBean cb=new CountBean(); ,5*xE\9G
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); uiA:(2AQ
CountCache.add(cb); 5T#D5Z<m
out.print(CountCache.list.size()+"<br>"); (OQ
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CountControl c=new CountControl(); 4[ 0?F!%
c.run(); RNtA4rC>#
out.print(CountCache.list.size()+"<br>"); ][#*h`I
%>