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: _<.VP
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CountBean.java (y>N\xS9
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/* 4};@QFT*
* CountData.java (cLK hn@
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* Created on 2007年1月1日, 下午4:44 ,6g{-r-2
* %[*-aA
* To change this template, choose Tools | Options and locate the template under 0@zJa;z'
* the Source Creation and Management node. Right-click the template and choose ?(=|!`IoO
* Open. You can then make changes to the template in the Source Editor. :gwmk9LZ
*/ oa"Bpi9i
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package com.tot.count; (rBsh6@)
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/** cl^UFlf[
* V[/9?5pM
* @author 06.%9R{
*/ ,ZJ}X 9$<
public class CountBean { w ea
private String countType; q][kD2
int countId; X.4WVI
/** Creates a new instance of CountData */ U%:%. Bys
public CountBean() {} [l5jPL}6
public void setCountType(String countTypes){ >]~581fYf
this.countType=countTypes; :
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} $mM"C+dD
public void setCountId(int countIds){ l.pxDMY
this.countId=countIds; ~wW]ntZm
} 2Cp4aTGv#
public String getCountType(){ 3pWav
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return countType; L.@$rFhA
} |9S8sfw
public int getCountId(){ <h/q^| tZ{
return countId; M{24MF
} g.9C>>tj
} _$>);qIP4
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CountCache.java Hu<]*(lK%
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/* *bFWNJ}`q
* CountCache.java ;F@Sz/
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* Created on 2007年1月1日, 下午5:01 i`F5
* ZiuD0#"!
* To change this template, choose Tools | Options and locate the template under C%yH}T\s
* the Source Creation and Management node. Right-click the template and choose As)?~dV
* Open. You can then make changes to the template in the Source Editor. F!#)l*OX;
*/ im&N&A
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package com.tot.count; D*-
import java.util.*; /W,hOv
/** (9%?ik
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* @author 8wkhbD|;
*/ r[Pp[g-J
public class CountCache { 3\m!
public static LinkedList list=new LinkedList(); Lld45Bayb
/** Creates a new instance of CountCache */ ~>>_`;B
public CountCache() {} y p{Dl
public static void add(CountBean cb){ }>@SyE'Q
if(cb!=null){ 4Y59^
list.add(cb); g$GGo[_0
} :} =lE"2
} O/#3QK
} 9~~NxWY%x
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CountControl.java L-?ty@-i
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/* Jt]RU+TB
* CountThread.java Q|o$^D,
* [&99#7B
* Created on 2007年1月1日, 下午4:57 kfas4mkc
* *.nSv@F
* To change this template, choose Tools | Options and locate the template under aWTurnee^
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. D1y`J&A>Q
*/ ^?Xs!kJP
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package com.tot.count; <1I4JPh>x
import tot.db.DBUtils; f{VV U/$
import java.sql.*; |Yw k
/** 6inAnC@I
* >C_G~R
* @author .\$A7DD+A
*/ O1o>eDE5A
public class CountControl{ M2cGr
private static long lastExecuteTime=0;//上次更新时间 ~vDa2D<9%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 {c)\}s(}F
/** Creates a new instance of CountThread */ V $I8iVGL
public CountControl() {} %(
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public synchronized void executeUpdate(){ 9oc_*V0<
Connection conn=null; If'2
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PreparedStatement ps=null; NL:-3W7vf
try{ *yT>
conn = DBUtils.getConnection(); ^*f D
conn.setAutoCommit(false); (mP{A(kwJ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); |1CX?8)b=
for(int i=0;i<CountCache.list.size();i++){ nyPeN?-
CountBean cb=(CountBean)CountCache.list.getFirst(); rGNa[1{kRs
CountCache.list.removeFirst(); rAP="H<