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: KN[;z2i
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CountBean.java vsZ?cd
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/* fggs
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* CountData.java D[ #V
* Y)DX
* Created on 2007年1月1日, 下午4:44 =u ?aP}zc
* o.Rv<a5.L
* To change this template, choose Tools | Options and locate the template under 6[4VbIBSI
* the Source Creation and Management node. Right-click the template and choose #XA`n@2Uoo
* Open. You can then make changes to the template in the Source Editor. g27'il
*/ 9aY8`B
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package com.tot.count; BkGExz
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/** ,!b<SQ5M
* |5tZ*$nGa
* @author (or"5}\6-
*/ R6Ov
public class CountBean { z-606g
private String countType; uBa<5YDF
int countId; N{S) b
/** Creates a new instance of CountData */ |:&6eDlR
public CountBean() {} 8"9&x}
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public void setCountType(String countTypes){ uT4|43<
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this.countType=countTypes; nAEyL+6U
} M@{#yEP
public void setCountId(int countIds){ P|bow+4
this.countId=countIds; -]HZ?@
} *
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public String getCountType(){ ;_)~h$1%=
return countType; 3g;,
} +Gt9!x}#e
public int getCountId(){ 1QG q;6\
return countId; ]FZPgO'G
} P+}~6}wJE
} ft6)n T/"&
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CountCache.java !43!JfD
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/* NBY|U{.g
* CountCache.java X<}}DZSu a
* uW(-?
* Created on 2007年1月1日, 下午5:01 ^ls@Gr7`P
* v62_VT2v
* To change this template, choose Tools | Options and locate the template under Ze eV-
* the Source Creation and Management node. Right-click the template and choose 0H}tb}4
* Open. You can then make changes to the template in the Source Editor. JiaR*3#
*/ #~|k EGt
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package com.tot.count; PY.K_(D
import java.util.*; 2CO/K_Q
/** KU/r"lMNlU
* o5tCbsHj-
* @author MhD'
*/ fw jo?
public class CountCache { ,UMr_ e{|
public static LinkedList list=new LinkedList(); I[Lg0H8
/** Creates a new instance of CountCache */ /;#kV]nF
public CountCache() {} &,k!,<IF
public static void add(CountBean cb){ p)yP_P
if(cb!=null){ 8m?(* [[
list.add(cb); B#Ybdp ;
} bTc>-e,
} FnA Kfh(
} 6M*z`B{hV
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CountControl.java d#rr7O
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/* 1@}F8&EZ
* CountThread.java <|}Z6Ti
* /GIGE##1F
* Created on 2007年1月1日, 下午4:57 THp_ dTD
* Nh.+woFq4
* To change this template, choose Tools | Options and locate the template under {Ya$Q#l
* the Source Creation and Management node. Right-click the template and choose Uz^N6q
* Open. You can then make changes to the template in the Source Editor. {fR\yWkt?
*/ cERIj0~
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package com.tot.count; ?ZlXh51
import tot.db.DBUtils; })/P[^
import java.sql.*; Yub}AuU`v
/** 5qtk#FB
* j%Au0k
* @author rUb{iU;~m
*/ ;`78h?`
public class CountControl{ 2!sPgIz
private static long lastExecuteTime=0;//上次更新时间 /4an@5.\C
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 og}Ri!^
/** Creates a new instance of CountThread */ 'Cc~|gOgD
public CountControl() {} >3uNh:|>/
public synchronized void executeUpdate(){ ,eyh%k*hz
Connection conn=null; 8_('[89m
PreparedStatement ps=null; u9hd%}9Qd?
try{ Ou_H&R
conn = DBUtils.getConnection(); q5(t2nNb
conn.setAutoCommit(false); M&V'*.xz
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); xS,24{-HJ
for(int i=0;i<CountCache.list.size();i++){ QRQZ{m
CountBean cb=(CountBean)CountCache.list.getFirst(); 9eMle?pF
CountCache.list.removeFirst(); G"<#tif9K
ps.setInt(1, cb.getCountId()); =NF0E8O
ps.executeUpdate();⑴ ..)J6L5l
//ps.addBatch();⑵ $l]:2!R
} qIi
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//int [] counts = ps.executeBatch();⑶ _i05'_
conn.commit(); PILpWhjL$9
}catch(Exception e){ A &