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: W)cLMGet
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CountBean.java >ULp!
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/* bobkT|s^s
* CountData.java I:<R@V<~#
* m=B0!Z1xx
* Created on 2007年1月1日, 下午4:44 !++62Lf
* 8zWPb
* To change this template, choose Tools | Options and locate the template under [Gy'0P(EQ
* the Source Creation and Management node. Right-click the template and choose V?BVk8D};
* Open. You can then make changes to the template in the Source Editor. Pltju4.:C
*/ K3DJ"NJ<Ji
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package com.tot.count; 0pa^O$?p
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/** nn4Sy,cz
* Els= :4
* @author CJ
*/ t}*!UixE
public class CountBean { (t$/G3E
private String countType; cV,Dl`1r
int countId; Po.BcytM
/** Creates a new instance of CountData */ FSs$ ]
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public CountBean() {} &Ld8Z9IeFp
public void setCountType(String countTypes){ M) XQi/
this.countType=countTypes; m?$G(E5
} PSS/JFZ^
public void setCountId(int countIds){ , vyx`wDd
this.countId=countIds; %W;Gf9.w
} 4ZpF1Zc4B
public String getCountType(){ 5O
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return countType; z %E!tB2o
} C&N4<2b
public int getCountId(){ s,H(m8#>
return countId; C)p<M H<
} %5?-g[
} &W//
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CountCache.java 9?chCO(@
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/* n@[</E(
* CountCache.java *[:CbFE0y
* TJS1,3<
* Created on 2007年1月1日, 下午5:01 kTc5KHJ7
* +\vY; !^
* To change this template, choose Tools | Options and locate the template under BV?N_/DXp
* the Source Creation and Management node. Right-click the template and choose e7qMt[.
* Open. You can then make changes to the template in the Source Editor. f?zK"
*/ ]Wt6V^M'@
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package com.tot.count; ]V^.!=gh$
import java.util.*; bu]Se6%}
/** X3iRR{< @
* D s,"E#?
* @author iiB )/~!O
*/ ^i)Q
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public class CountCache { '4lT*KN7\
public static LinkedList list=new LinkedList(); wf<`J/7u
/** Creates a new instance of CountCache */ yPG\ &Bo
public CountCache() {} }.V0SM6
public static void add(CountBean cb){ >@"3Q`
if(cb!=null){ [3sxzU!t~
list.add(cb); TxxB0
} / !
} 0*/ r'
} T^;Jz!e
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CountControl.java }6,bq`MN
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/* ^I~T$YjC '
* CountThread.java exEld
* G^@Jgx3n
* Created on 2007年1月1日, 下午4:57 ?WtG|w
* @j2*.ee
* To change this template, choose Tools | Options and locate the template under HT=Am
* the Source Creation and Management node. Right-click the template and choose mYOdBd
* Open. You can then make changes to the template in the Source Editor. )LrCoI =|
*/ ( WtE`f;Q
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package com.tot.count; V -4*nV
import tot.db.DBUtils; pMZf!&tM
import java.sql.*; n.6
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/** U2>dwn
* FoD/Q
* @author })Mv9~&S
*/ C\^<v&
public class CountControl{ A.C278^O8
private static long lastExecuteTime=0;//上次更新时间 \R>5F\ 0
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 DEp%\sj?
/** Creates a new instance of CountThread */ lJ] \
public CountControl() {} `NWgETf^#
public synchronized void executeUpdate(){ IL2Gsj)M
Connection conn=null; +9
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PreparedStatement ps=null; 2|H91Y2
try{ &c?hJ8"
conn = DBUtils.getConnection(); Ed0>R<jR9
conn.setAutoCommit(false); q|$>H6H4b
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 8xpYQ<cax
for(int i=0;i<CountCache.list.size();i++){ NRuG?^/}d
CountBean cb=(CountBean)CountCache.list.getFirst(); #[0\=B-
CountCache.list.removeFirst(); $ X=D9h
ps.setInt(1, cb.getCountId()); ctUF/[_w;
ps.executeUpdate();⑴ _
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//ps.addBatch();⑵ +V+*7s%fL
} ;ko[(eFN@
//int [] counts = ps.executeBatch();⑶ e]*=sp!T
conn.commit(); <,4R2'
}catch(Exception e){ vXM/nw|5
e.printStackTrace(); fov=Yd!
} finally{ JGO$4DK-1
try{ ogc('HqF^'
if(ps!=null) { +`s&i%{1>
ps.clearParameters(); h6T/0YhWLP
ps.close(); ['OCw {<
ps=null; 1S[5#ewB;j
} ^'u;e(AaE
}catch(SQLException e){} t3#H@0<
DBUtils.closeConnection(conn); F`BgKH!
} HLoQ}oK|K
} \abAPo
public long getLast(){ |CZnq-,C
return lastExecuteTime; Oz#EGjz
} ss0'GfP
public void run(){ Vyt~OTI\
long now = System.currentTimeMillis(); [N95.aD
if ((now - lastExecuteTime) > executeSep) { nvs}r%1'5
//System.out.print("lastExecuteTime:"+lastExecuteTime); VkTlPmr
//System.out.print(" now:"+now+"\n"); >SxZ9T|%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); m]=oaj@9
lastExecuteTime=now; iy.%kHC
executeUpdate(); oF@x]bmU
} ULNAH`{D
else{ v<7Gln
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); D _bkUR1
} +{C9uY)$vf
} #[U9(44,
} >\?z37: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 Yf!*OGF
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类写好了,下面是在JSP中如下调用。 (+gL#/u
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<% inPdV9
CountBean cb=new CountBean(); =(|xU?OL
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); C7jc 6(>m
CountCache.add(cb); t;LX48TQ
out.print(CountCache.list.size()+"<br>"); ,na=~.0R:
CountControl c=new CountControl(); N,/BudFo
c.run(); D-o7yc"K
out.print(CountCache.list.size()+"<br>"); b,rH&+2H
%>