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: Mp_SL^g|
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CountBean.java 7i0;Ss*
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/* ,nGZ(EBD
* CountData.java K'zBDrkW-x
* o)sX?IiC
* Created on 2007年1月1日, 下午4:44 h{.x:pPXy
* .&;:X )
* To change this template, choose Tools | Options and locate the template under ey ?paT
* the Source Creation and Management node. Right-click the template and choose 1(vcM
* Open. You can then make changes to the template in the Source Editor. nV>=n,+s"
*/ 0ra+MQBg
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package com.tot.count; ^KjxQO6y3
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/** qLk7C0
* F,h}HlU
* @author 4mwLlYZ
*/ }cd-BW
public class CountBean { >e^8fpgSo
private String countType; x>[f+Tc
int countId; #)z7&nD
/** Creates a new instance of CountData */ l;vA"b=]
public CountBean() {} G&@vTcF
public void setCountType(String countTypes){ P.'$L\
this.countType=countTypes; naiy] oY"
} ku^0bq}BrH
public void setCountId(int countIds){ CQI\/oaO
this.countId=countIds; o0#zk
} ~NZ}@J{00_
public String getCountType(){ 7~2V5@{<
return countType; <~P([5
} 3Ss)i7
public int getCountId(){ ,Lr}P
return countId; TF-a1z
} mExJ--}
} ~NBlJULS
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CountCache.java f (ug3(j
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/* q|S,^0cU
* CountCache.java f1X]zk(=W
* 2PQY+[jx
* Created on 2007年1月1日, 下午5:01 =e|
* t[%ELHV
* To change this template, choose Tools | Options and locate the template under 9}#9i^%}
* the Source Creation and Management node. Right-click the template and choose "fWm{;
* Open. You can then make changes to the template in the Source Editor. {IT;g9x
*/ 31{)~8
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package com.tot.count; iuHs.k<z
import java.util.*; Z.3*sp0
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/** $##LSTA
* X,ok 3c4X
* @author "xp>Vj
*/ P;[>TCs ]8
public class CountCache { AN4(]_]
public static LinkedList list=new LinkedList(); Na{&aqdz
/** Creates a new instance of CountCache */ K?H(jP2mpM
public CountCache() {} 1SY3
public static void add(CountBean cb){ V2BsvR`
if(cb!=null){ 2X|nPhNi
list.add(cb); ],w+4;+
} m}GEx)Y D
} 0JX/@LNg0
} u!9bhL`
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CountControl.java u#`'|ko\9
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/* Vo(V<2lw}
* CountThread.java S'(Hl}h!.
* U_1N*XK6$
* Created on 2007年1月1日, 下午4:57 $S2kc$'F
* .MI
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* To change this template, choose Tools | Options and locate the template under (qg~l@rf
* the Source Creation and Management node. Right-click the template and choose ;7bY>zc(w
* Open. You can then make changes to the template in the Source Editor. pb}4{]sI
*/ Qm2(Z8Gh
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package com.tot.count; Aj "SSX!L
import tot.db.DBUtils; A^@,Ha
import java.sql.*; x(bM
/** vH/Y]Am
* O*-sSf
* @author ^=Egf?|[
*/ <PTi>C8;r
public class CountControl{ g].v
private static long lastExecuteTime=0;//上次更新时间 .Af H>)E
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #Q$`3rr
/** Creates a new instance of CountThread */ |
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public CountControl() {} g0"KCX
public synchronized void executeUpdate(){ -K U@0G
Connection conn=null; Ps9YP B-
PreparedStatement ps=null; %LBT:Aw
try{ VO+3@d:
conn = DBUtils.getConnection(); ["XS|"DM
conn.setAutoCommit(false); 8,YxCm ie
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); E K#ib
for(int i=0;i<CountCache.list.size();i++){ eVB.g@%T
CountBean cb=(CountBean)CountCache.list.getFirst(); p="K4E8~H
CountCache.list.removeFirst(); {uji7TB
ps.setInt(1, cb.getCountId()); W!4xE
ps.executeUpdate();⑴ v m)'CC
//ps.addBatch();⑵ HK!Vd_&9,
} 'w!8`LPu
//int [] counts = ps.executeBatch();⑶ &{(8EvuDd
conn.commit(); ~7"6Y]
}catch(Exception e){ QE%|8UFY
e.printStackTrace(); ts~$'^K[-
} finally{ iMXK_O%
try{ AAld2"r
if(ps!=null) { IX
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ps.clearParameters(); qD/FxR-!
ps.close(); X]AbBzy
ps=null; } P/
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} "Go)t+-
}catch(SQLException e){} lp%i%*EQ*
DBUtils.closeConnection(conn); U&<w{cuA
} }doJ=lc
} =OU]<%
public long getLast(){ XqK\'8]\Mw
return lastExecuteTime; /e4#DH
} 8GFA}_(^R
public void run(){ }c-tvK1g
long now = System.currentTimeMillis(); ?L~Z]+-
if ((now - lastExecuteTime) > executeSep) { Lmw{ `R
//System.out.print("lastExecuteTime:"+lastExecuteTime); \~`qE<Q/
//System.out.print(" now:"+now+"\n"); 0&|,HK
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); "J (.dg]"
lastExecuteTime=now;
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executeUpdate(); 0A>Fl*
} 7+^4v(s
else{ b1`(f"&l
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 4<QSot
} 'hw_ew
} l#G }j^Q
} #3o]Qo[Sc
//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 Ro oem dCM
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类写好了,下面是在JSP中如下调用。 B)`^/^7
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<% /o=,\kM
CountBean cb=new CountBean(); p$A` qx<M_
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 95CCje{o_
CountCache.add(cb); ViG4tb
out.print(CountCache.list.size()+"<br>"); a,U@ !}K
CountControl c=new CountControl(); K;_.WzWD=
c.run(); H<6/i@ly
out.print(CountCache.list.size()+"<br>"); ,0R2k `m!
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