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: v\ Ljm,+
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CountBean.java >-P0wowL
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/* 'T[zh#v>S
* CountData.java kgz{m;R
* G)&'8W F5o
* Created on 2007年1月1日, 下午4:44 qx)k1 QY
* GcnY=%L?
* To change this template, choose Tools | Options and locate the template under ZkW@ |v
* the Source Creation and Management node. Right-click the template and choose ju]]|
* Open. You can then make changes to the template in the Source Editor. &wN
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*/ #E9['Jn Z
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package com.tot.count; yr>bL"!CA
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/** ?_aR-[XRg
* spJ(1F{|V
* @author 4*x!B![]y
*/ PAHlj,n)
public class CountBean { 0Mg8{
private String countType; F:S,{&jB
int countId; W[Bu&?h$
/** Creates a new instance of CountData */ 7g)3\C
public CountBean() {} @@wx~|%
public void setCountType(String countTypes){ CeTr%j
this.countType=countTypes; _sVs6AJ
} $]kg_l)
public void setCountId(int countIds){ [.X%:H+
this.countId=countIds; FE}!bKh
} `l2q G#
public String getCountType(){ n5.>;N.*
return countType; PQ}%}S7:
} Jj:6
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public int getCountId(){ FRFAWK<
return countId; It4z9Gh
} 4_+Pv6
} #[y<h3f]
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CountCache.java N-`;\
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/* ,dx)rZ*
* CountCache.java 8/"|VE DOr
* IY6_JGe_w
* Created on 2007年1月1日, 下午5:01 yvCR = C
* Jwd&[
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* To change this template, choose Tools | Options and locate the template under d&uTiH? 0
* the Source Creation and Management node. Right-click the template and choose m> (h_j
* Open. You can then make changes to the template in the Source Editor. SDHc[66'
*/ nKB&|!
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package com.tot.count; z,FTsR$x
import java.util.*; @b\ S.
/** .vS6_
* 1?|6odc
* @author *Ca)RgM
*/ JA(fam~{
public class CountCache { RX5.bVp
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public static LinkedList list=new LinkedList(); kLt9;<L
/** Creates a new instance of CountCache */ ;#s}b1
public CountCache() {} liqR#<
public static void add(CountBean cb){
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if(cb!=null){ =5~F6to
list.add(cb); <m,yFk
} K;p<f{PE
} Xexe{h4t_>
} Pzp+I}
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CountControl.java K\+}q{
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/* ie@`S&.8 T
* CountThread.java *fi;ZUPW3
* P%sO(_PuT
* Created on 2007年1月1日, 下午4:57 $[iT~B$
* ]A72)1
* To change this template, choose Tools | Options and locate the template under ^qO=~U!{
* the Source Creation and Management node. Right-click the template and choose !UoU#YU
* Open. You can then make changes to the template in the Source Editor. Zknewv*sS4
*/ C$LRY~\
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package com.tot.count; c~UAr k S
import tot.db.DBUtils; $i:||L^8p
import java.sql.*; u'i%~(:$\)
/** LkGf|yd_
* F|?'9s*;6G
* @author :e]9T3Q
*/ wB>S\~i
public class CountControl{ <*"pra{3
private static long lastExecuteTime=0;//上次更新时间 OR\DTLIl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 pEVgJ/>
/** Creates a new instance of CountThread */ #[a"%byTR
public CountControl() {} ) wY!/&
public synchronized void executeUpdate(){ g&+Y{*Gp
Connection conn=null; qC1U&b#MVx
PreparedStatement ps=null; H5rPq_R
try{ P:(EU s}0
conn = DBUtils.getConnection(); .L7Yf+yFg
conn.setAutoCommit(false); /^LH
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); *)bd1B#
for(int i=0;i<CountCache.list.size();i++){ d"I28PIS"
CountBean cb=(CountBean)CountCache.list.getFirst(); 'DzBp
CountCache.list.removeFirst(); 8.CKH4h
ps.setInt(1, cb.getCountId()); f[Fgh@4cj
ps.executeUpdate();⑴ )W]>\=@Y
//ps.addBatch();⑵ N
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} wfDp,T3w7
//int [] counts = ps.executeBatch();⑶ lMwk.#
conn.commit(); [.;%\>Qk<
}catch(Exception e){ Kr/h`RM
e.printStackTrace(); N(:nF5>_
} finally{ 4e@&QOo`Cu
try{ H+VO.s.a
if(ps!=null) { _7lt(f[S
ps.clearParameters(); HX3D*2v":
ps.close(); ],\sRQbv&
ps=null; IAP/G5'Q
} e)HhnN@
}catch(SQLException e){} 1iJ0Hut}d
DBUtils.closeConnection(conn); o)tKH@`vE
} ,$h(fM8GC
} 1xO!w+J#
public long getLast(){ PNbcy!\U
return lastExecuteTime; |
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} j?\$G.Y
public void run(){ gT(th9'+z
long now = System.currentTimeMillis(); JG@L5f
if ((now - lastExecuteTime) > executeSep) { Rkpr8MS
//System.out.print("lastExecuteTime:"+lastExecuteTime); w dGpt_
//System.out.print(" now:"+now+"\n"); \[hn]@@
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9DOkQnnc
lastExecuteTime=now; UU iNR
executeUpdate(); %1\v7Xw{9
} D[89*@v
else{ ZT) !8
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Cf0|Z
} *$i; o3
} HKTeqH_:
} [x!i*
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 (;0$i?3\
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类写好了,下面是在JSP中如下调用。 EqD^/(,L2
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<% ?}'N_n ys
CountBean cb=new CountBean(); J?UA:u
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); W/ g|{t[
CountCache.add(cb); e9CP802#2
out.print(CountCache.list.size()+"<br>"); ^W
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CountControl c=new CountControl(); 0A#*4ap
c.run(); &
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out.print(CountCache.list.size()+"<br>"); vG ]GQ#
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