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: M;AvOk|&
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CountBean.java ]NW_oRH
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/* !YO'u'4<aK
* CountData.java Mg}/gO%o
* gE*7[*2?t
* Created on 2007年1月1日, 下午4:44 zFYzus`>
* 'O2/PU2_
* To change this template, choose Tools | Options and locate the template under }{PG^ Fc<P
* the Source Creation and Management node. Right-click the template and choose icVB?M,m
* Open. You can then make changes to the template in the Source Editor. >bmdu\j5R
*/ 3,hu3"@k
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package com.tot.count; ^HuB40
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/**
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* N?,
* @author e `JWY9%
*/ ]sP
public class CountBean { p,(W?.ZDN?
private String countType; c*R\fQd
int countId; Ed-3-vJej6
/** Creates a new instance of CountData */ g#1Y4
public CountBean() {} I;?PDhDb
public void setCountType(String countTypes){ Ms3GvPsgv
this.countType=countTypes; s6}SdmE
} X4'!:&
public void setCountId(int countIds){ I
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this.countId=countIds; &oZU=CN
} 77+3CME{'
public String getCountType(){ @x[A^
return countType; k%sxA
} P,G
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public int getCountId(){ 5w~J"P6jg
return countId; c;a<nTLn
} V4n;N
} oxnI/Z
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CountCache.java M,oZ_tY%
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/* -i91nMi]
* CountCache.java Cd6th
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* 33~8@]b
* Created on 2007年1月1日, 下午5:01 z'O+B}
* k1P'Q&Na
* To change this template, choose Tools | Options and locate the template under qMA";Frt3N
* the Source Creation and Management node. Right-click the template and choose NCo!n$O1~
* Open. You can then make changes to the template in the Source Editor. 8B!QqLqK
*/ {+5Ud#\y
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package com.tot.count; 23'<R i
import java.util.*; _2<UcC~
/** 4Xwb`?}-
* nHZhP4W
* @author E*,nKJu'r
*/ 6u`$a&dR'l
public class CountCache { A|U0e`Iw
public static LinkedList list=new LinkedList(); nC?Lz1re
/** Creates a new instance of CountCache */ VT~%);.#
public CountCache() {} dd
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public static void add(CountBean cb){ a>d`g
if(cb!=null){ +`$$^x
list.add(cb); ])?h~
} w~=xO_%
} #IDLfQ5g
} ,S`FxJcE
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CountControl.java Fs =)*6}&
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/* Ty7`&
* CountThread.java F$:UvW@e1
* JnqP`kYbTE
* Created on 2007年1月1日, 下午4:57 ofI,[z3
* sint":1FC
* To change this template, choose Tools | Options and locate the template under 'w<^4/L Q
* the Source Creation and Management node. Right-click the template and choose ^LXsU]
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* Open. You can then make changes to the template in the Source Editor. =@hCc
*/ *.D{d0A
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package com.tot.count; {F\P3-ub
import tot.db.DBUtils; tehWGqx)
import java.sql.*; :hWG:`
/** +^AAik<yl
* ;nAx@_ab^
* @author VP~%,=
*/ zYWVz3l
public class CountControl{ V|awbff:
private static long lastExecuteTime=0;//上次更新时间 <y7Hy&&y-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -H|!KnR
/** Creates a new instance of CountThread */ ]ab q$Y'
public CountControl() {} W+4Bx=Mj
public synchronized void executeUpdate(){ b=Ektq
Connection conn=null; @LS%uqs
PreparedStatement ps=null; J*6B~)Sp@
try{ 3Q7PY46
conn = DBUtils.getConnection(); 7Xh @%[
conn.setAutoCommit(false); )"2eN3H/
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &t