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: FDM&rQ
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CountBean.java 8`}(N^=}
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/* -=,%9r
* CountData.java Cr|v3Y#h'
* QIQ }ia
* Created on 2007年1月1日, 下午4:44 xevG)m
* -]"=b\Q
* To change this template, choose Tools | Options and locate the template under aZ^P*|_K3
* the Source Creation and Management node. Right-click the template and choose |E$Jt-'
* Open. You can then make changes to the template in the Source Editor. 5&q@;vR
*/ {bnNY
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package com.tot.count; dO.?S89L
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/** &\8.y2=9p
* *m:h0[[J
* @author nB2AmS
*/ c\~H_ ~F
public class CountBean { Q>f^*FyOw<
private String countType; !PUbaF-.6
int countId; .kh%66:
/** Creates a new instance of CountData */ B$qmXA)ze
public CountBean() {} S@]7
public void setCountType(String countTypes){ ~8~B VwZ_
this.countType=countTypes; bHE'R!*
} rhY>aj
public void setCountId(int countIds){ d&'z0]mOe
this.countId=countIds; K_j$iHqLF
} %:^,7
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public String getCountType(){ Ai\"w 0
return countType; E< nXkqD
} v<iMlOEt
public int getCountId(){ >ijFQ667>j
return countId; yO.3~H)c
} +;SQ}[
} iA*Z4FKkT
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CountCache.java /=Bz[O
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/* M$g%kqa
* CountCache.java e"(l
* 5zG6V2
* Created on 2007年1月1日, 下午5:01 n's3!HQY[
* bsVms,&
* 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 epa)ctS9
* Open. You can then make changes to the template in the Source Editor. cC
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*/ pj>b6^TI6C
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package com.tot.count; dgPJte%i
import java.util.*; ]4SnOSV?S
/** P{mV
* :0>wm@qCQ
* @author v<bq1QG
*/ `HU`=a&d
public class CountCache { 0z{S@
public static LinkedList list=new LinkedList(); n
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/** Creates a new instance of CountCache */ f"Yj'`6
public CountCache() {} jfF,:(P%W
public static void add(CountBean cb){ +:1ay^YI
if(cb!=null){ ~a m]G0
list.add(cb); 8}h ^Frh
} ?^P#P0
} YfUdpa0
} m! &bK5+*
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CountControl.java awuUaE
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/* %Q"zU9
* CountThread.java 0?l|A1I%
* Y9~;6fg
* Created on 2007年1月1日, 下午4:57 k9UmTvX
* pWH8ex+
* To change this template, choose Tools | Options and locate the template under j~c7nWfX
* the Source Creation and Management node. Right-click the template and choose d$)'?Sf]h
* Open. You can then make changes to the template in the Source Editor. [^ck;4q
*/ Malt7M
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package com.tot.count; ZV}BDwOFI
import tot.db.DBUtils; {OP-9P=p
import java.sql.*; r:K)Q@
/** =BY)>0?z
* B5Rm z&
* @author )xCpQ=nS
*/ ]3hz{zqV^
public class CountControl{
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private static long lastExecuteTime=0;//上次更新时间 _v4TyJ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _=B(jJZ
/** Creates a new instance of CountThread */ ?@Z~i]gE[V
public CountControl() {} 5)V]qV$
public synchronized void executeUpdate(){ evsH>hE^
Connection conn=null; C- ]H+p
PreparedStatement ps=null; q]:+0~cz
try{ -_'M
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conn = DBUtils.getConnection(); pr>Qu:
conn.setAutoCommit(false); [,Ts;Hy6Q
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <