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: $3'xb/3|
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CountBean.java V<&^zIJUR
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/* nd#owjB
* CountData.java o6Jhl8
* dMlJ2\]u
* Created on 2007年1月1日, 下午4:44 &)ED||r,
* E gD$A!6N8
* To change this template, choose Tools | Options and locate the template under F>lM[Lu#
* the Source Creation and Management node. Right-click the template and choose :6[G;F7s
* Open. You can then make changes to the template in the Source Editor. 9pMXjsE
*/ !+V."*]l
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package com.tot.count; zc.r&(d
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/**
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* $No^\.mV
* @author _fM=J+
*/ f>zd,|)At
public class CountBean { UY}EW`$#m
private String countType; \TS.9 >\
int countId; k((kx:
/** Creates a new instance of CountData */ 0 H0U%x8
public CountBean() {} i*jnC>
public void setCountType(String countTypes){ '(fzznRH
this.countType=countTypes; "%rzL.</
} m88(f2Ch
public void setCountId(int countIds){ 8I]rC<O6:
this.countId=countIds; VoC|z Rd_
} | <bZ*7G
public String getCountType(){ ZU68\cL
return countType; 8O| w(z
} 8JojKH
public int getCountId(){ 9l<}`/@}W
return countId; k!0vpps
} fJK;[*&Y
} ;;}}uW=
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CountCache.java ufB9\yl{~
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/* XES$V15
* CountCache.java qNX+!Y}y
* qoAJcr2uN
* Created on 2007年1月1日, 下午5:01 RHu4cK!5
* RH^;M-'
* To change this template, choose Tools | Options and locate the template under WiqkC#N
* the Source Creation and Management node. Right-click the template and choose Fgw$;W
* Open. You can then make changes to the template in the Source Editor. 5 D[`nU}
*/ q-r5z GI
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package com.tot.count; /}Ct2w&<k
import java.util.*; Q;k
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/** !N74y%=M
* #SR )tU
* @author l<UA0*t
*/ 4bq+(CI6
public class CountCache { bo
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public static LinkedList list=new LinkedList(); [H=l#W@
/** Creates a new instance of CountCache */ TUX:[1~Nf[
public CountCache() {} q22@ZRw
public static void add(CountBean cb){ H8A=]Gq
if(cb!=null){ h3(B7n7
list.add(cb); YDaGr6y4i
} $]~|W3\G
} FPkig`(3
} , GMuq_H
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CountControl.java A"wso[{
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/* rU_FRk
* CountThread.java RPZ
-
* q@d6P~[-gj
* Created on 2007年1月1日, 下午4:57 GiKmB-HO
* l:(?|1_
* To change this template, choose Tools | Options and locate the template under v
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* the Source Creation and Management node. Right-click the template and choose vpP8'f.
* Open. You can then make changes to the template in the Source Editor. :auq#$B
*/ 9=9R"X>L
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package com.tot.count; -c
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import tot.db.DBUtils; yJ2A!id
import java.sql.*; ,ik\MSS
/** s@K #M
* 2$O6%0
* @author :9W)CwZ)V
*/ Wl{wY,u
public class CountControl{ kj@m5`G
private static long lastExecuteTime=0;//上次更新时间 :o_6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 zvKypx
/** Creates a new instance of CountThread */ z<u@::
public CountControl() {} mU;\,96#
public synchronized void executeUpdate(){ V/t-
Connection conn=null; *?!A
PreparedStatement ps=null; _))--+cL
try{ Z`yW2ON$'
conn = DBUtils.getConnection(); *W<|5<<u@
conn.setAutoCommit(false); #IxCI)!I{[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); eXQzCm
for(int i=0;i<CountCache.list.size();i++){ [p96H)8YU
CountBean cb=(CountBean)CountCache.list.getFirst(); }^ZPah
CountCache.list.removeFirst(); ca"20NQ)
ps.setInt(1, cb.getCountId()); Y4)=D@JI
ps.executeUpdate();⑴ 2^fSC`!
//ps.addBatch();⑵ jEW@~e
} qViolmDz
//int [] counts = ps.executeBatch();⑶ to3D#9Ep
conn.commit(); L7B(abT9e
}catch(Exception e){ t**o<p#)f
e.printStackTrace(); 9 [wR/8Xm
} finally{ A{ Ejk|
try{ \"Aw
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if(ps!=null) { 3t$)saQR
ps.clearParameters(); YCu9dBeVS
ps.close(); 2@a]x(
ps=null; ?OdJt
} "kkZK=}Nv
}catch(SQLException e){} ?Q/9aqHe;
DBUtils.closeConnection(conn); 0
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} 8\rHSsP
} Ks.kn7<l
public long getLast(){ LYp=o8JW|
return lastExecuteTime; "hXB_73)V
} 'fIirGOl
public void run(){ WHvxBd
long now = System.currentTimeMillis(); e]u3[ao
if ((now - lastExecuteTime) > executeSep) { r^!P=BS{
//System.out.print("lastExecuteTime:"+lastExecuteTime); APY*SeIV
//System.out.print(" now:"+now+"\n"); r?wE ;gH
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); -,}ppTG
lastExecuteTime=now; 'E~[I"0
executeUpdate(); a[Oi
} X5wYfN
else{ Wj#Gm
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 5mF"nY&lI
} IQQWp@w#8
} "P{T]
} F<N{ x^
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 I:,D:00+
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类写好了,下面是在JSP中如下调用。 y1+~IjY
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<% MYF6tZ*
CountBean cb=new CountBean(); nh+f,HtSt
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); . [5{
CountCache.add(cb); "jEf$]
out.print(CountCache.list.size()+"<br>"); 'U3+'du^8
CountControl c=new CountControl(); pTk1iGfB
c.run(); :{KoZd
out.print(CountCache.list.size()+"<br>");
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%>