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: 4)w,gp
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CountBean.java YQN:&Cls
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/* O]PM L`
* CountData.java _,L_H[FN
* &6vaLx
* Created on 2007年1月1日, 下午4:44 w/*G!o-<
* toPbFU'
* To change this template, choose Tools | Options and locate the template under 7?whxi Qs
* the Source Creation and Management node. Right-click the template and choose #]jl{K\f#X
* Open. You can then make changes to the template in the Source Editor. ,6{z
*/ e' l9
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package com.tot.count; yk8b>.Y\A
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/** + kKanm[!v
* 2]mV9B
* @author <(jk}wa<
*/ 1@L18%h
public class CountBean { n/5T{ NfG
private String countType; O.B9w+G=
int countId; 2/4zg
/** Creates a new instance of CountData */ wH o}wp
public CountBean() {} 1;( h0j
public void setCountType(String countTypes){ gvR]"h
this.countType=countTypes; 6NX#=A
} H}kZ;8
public void setCountId(int countIds){ (s;W>,~q
this.countId=countIds; C~pas~
} %cSx`^`6j
public String getCountType(){ $@'BB=i
return countType; X3}eq|r9
} \:J=tAC
public int getCountId(){ !{^kH;*u
return countId; IADHe\.
} wmGcXBHt$
} T<0 r,
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CountCache.java We{@0K/O
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/* 0vjCSU-X
* CountCache.java wvq4 P
* +Xs E
* Created on 2007年1月1日, 下午5:01 _A C N
* 1jd{AqHl
* To change this template, choose Tools | Options and locate the template under v>wN
O
* 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. R#hy2kA
*/ !Sn|!:N4
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package com.tot.count; v%qOW)].
import java.util.*; i=#`7pt%'a
/** $b|LZE\bU.
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* @author 9iG&9tB@
*/ C})Dvh
public class CountCache { c`xNTr01
public static LinkedList list=new LinkedList(); G"?7 Z&+
/** Creates a new instance of CountCache */ b$DiDm
public CountCache() {} U/enq,-F^
public static void add(CountBean cb){ 0]SWyC
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if(cb!=null){ 9\.0v{&v
list.add(cb); eI:[o
} f/J/tt
} ,7j8+p|},
} (O+d6oT=Z2
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CountControl.java X\Bl?
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/* ^Q`5+
* CountThread.java aPelt`
* +4%~.,<_to
* Created on 2007年1月1日, 下午4:57 L-w3A:jk
* !s-A`}
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* To change this template, choose Tools | Options and locate the template under ndLEIqOY
* the Source Creation and Management node. Right-click the template and choose ,RR{Y-
* Open. You can then make changes to the template in the Source Editor. A6=Z2i0w>X
*/ by>%}#M
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package com.tot.count; Y|LL]@Lv
import tot.db.DBUtils; k";dK*hD,
import java.sql.*; O z0-cM8t
/** H*N <7#
* P6GTgQ<'BA
* @author ,pD sU @
*/ `'s_5Ek
public class CountControl{ sR9$=91`
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒
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/** Creates a new instance of CountThread */ &'/"=lK
public CountControl() {} }9\_s*
public synchronized void executeUpdate(){ O6Py
Connection conn=null; 5&s6(?,Eu
PreparedStatement ps=null; 9Do75S{(
try{ p"hO6b%V
conn = DBUtils.getConnection(); 0;TiNrzg
conn.setAutoCommit(false); c]Epg)E
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); f DXK<v)
for(int i=0;i<CountCache.list.size();i++){ #`3Q4
CountBean cb=(CountBean)CountCache.list.getFirst();
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CountCache.list.removeFirst(); i$] :Y`3h
ps.setInt(1, cb.getCountId()); &