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: 35e{{Gn)v
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CountBean.java aW&)3C2-x
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/* ,_RNZ
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* CountData.java ?V^7`3F
* e@ZM&iR
* Created on 2007年1月1日, 下午4:44 G#7(6:=;,`
* Rt+ -ud{O
* To change this template, choose Tools | Options and locate the template under M
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* the Source Creation and Management node. Right-click the template and choose G#GZt\)F
* Open. You can then make changes to the template in the Source Editor. +K`A2&F9
*/ }QE*-GVv]
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package com.tot.count; U*$xR<8v
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/** }ARA K ^%
* Wq1 jTIQ
* @author yQN{)rv
*/ P$#: $U@
public class CountBean { h&$h<zL[
private String countType; mnsl$H_4S
int countId; $3g{9)}
/** Creates a new instance of CountData */ JUpV(p"-r
public CountBean() {} \H@1VgmR;
public void setCountType(String countTypes){ Zob/H+]
this.countType=countTypes; @I`^\oJ
} <]M.K3>
public void setCountId(int countIds){ c
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this.countId=countIds; - |g"q|
} 1^}I?PbqV
public String getCountType(){ T"_'sSI>tF
return countType; P.,U>m
} F#sm^% _2
public int getCountId(){ =Nxkr0])!
return countId; 0B]q /G(
} y(p_Unm
} <ukBAux,D
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CountCache.java c0gVW~I1
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/* `x`[hJ?i
* CountCache.java l[38cF
* P9
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* Created on 2007年1月1日, 下午5:01 bx8](cT_
* tNi>TkC}`
* To change this template, choose Tools | Options and locate the template under \g39>;iR
* the Source Creation and Management node. Right-click the template and choose ##7y|AwK
* Open. You can then make changes to the template in the Source Editor. fORkH^Y(&
*/ 6QX m]<
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package com.tot.count; s{Z)<n03
import java.util.*; esqmj#G
/** {arqcILr
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* @author R-13DVK
*/ FmL]|~
public class CountCache { *j%x
public static LinkedList list=new LinkedList(); z~
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/** Creates a new instance of CountCache */ 9{toPED
public CountCache() {} h xO}'`:
public static void add(CountBean cb){ Gmz^vpQ]t
if(cb!=null){ "jFf}"
list.add(cb); i+*!"/De
} L=r*bq
} %=`JWLLG
} \HfAKBT
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CountControl.java
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/* \#{PV\x:Nn
* CountThread.java /<J(\;Jr6
* 6_Fr \H
* Created on 2007年1月1日, 下午4:57 cMw<3u\
* ,QY$:f<
* To change this template, choose Tools | Options and locate the template under >
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* the Source Creation and Management node. Right-click the template and choose ->sxz/L
* Open. You can then make changes to the template in the Source Editor. h.jJAVPi
*/ Y2u\~.;oq
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package com.tot.count; ~]?:v,UIm(
import tot.db.DBUtils; N~v6K}`}
import java.sql.*; v ,8;:
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/** pHV^Kv#
* T6U/}&{O
* @author _fHC+lwN
*/ z5E%*]
public class CountControl{ ^#9385
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 tn]nl!_@
/** Creates a new instance of CountThread */ ig,.>'+l
public CountControl() {} J2bvHxb Rd
public synchronized void executeUpdate(){
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Connection conn=null; z*\_+u~u
PreparedStatement ps=null; Hn|W3U
try{ VW-qQe
conn = DBUtils.getConnection(); R'>!1\?Iq
conn.setAutoCommit(false); (8duV
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); i}-uK,^
for(int i=0;i<CountCache.list.size();i++){ b}[S+G-9W
CountBean cb=(CountBean)CountCache.list.getFirst(); =+zDE0Qs
CountCache.list.removeFirst(); _olQ;{ U:
ps.setInt(1, cb.getCountId()); Nu5|tf9%A
ps.executeUpdate();⑴ 2Ez<Iw
//ps.addBatch();⑵ dljE.peL
} Q Be6\oq
//int [] counts = ps.executeBatch();⑶ &d_^k.%y
conn.commit(); I'/3_AX
}catch(Exception e){ K"#$",}=
e.printStackTrace(); GEc6;uz<
} finally{ Z(mUU]
try{ F-&tSU,
if(ps!=null) { 1[FN: hm
ps.clearParameters(); ]}2)U
ps.close(); V=O52?8
ps=null; M(%H
} h0{X$&:
}catch(SQLException e){} %w`d
DBUtils.closeConnection(conn); g`Z=Y7jLH
} ~k"+5bHa*
} VY?9|};f
public long getLast(){ #}`sfaT
return lastExecuteTime; HW@wia
} d$t"Vp
public void run(){ "+HJ/8Dd1
long now = System.currentTimeMillis(); J4Gzp~{
if ((now - lastExecuteTime) > executeSep) { AO#9XDEM
//System.out.print("lastExecuteTime:"+lastExecuteTime); bi<<z-q`wJ
//System.out.print(" now:"+now+"\n"); cgnNO&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9vI~vl l
lastExecuteTime=now; -ng1RA>
executeUpdate(); !/FRL<mp
} Aoe\\'O|V
else{ ohx[_}xN
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Y|Iq~Qy~
} f ,F X# _4
} (3Db}Hnn
} inut'@=G/
//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 ,AP&N'
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类写好了,下面是在JSP中如下调用。 K-RmB4WI
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<% N} EKV
CountBean cb=new CountBean(); |iM,bs
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Y_Yf'z1>[
CountCache.add(cb); ?UnQ?F(+G<
out.print(CountCache.list.size()+"<br>"); c -w #`
CountControl c=new CountControl(); \8vP"Kr
c.run(); #M-!/E
out.print(CountCache.list.size()+"<br>"); -|>~I#vY
%>