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: ;{S7bH'6m
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CountBean.java (8d"G9R(
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/* |\] _u 3
* CountData.java O$$$1VHYo
* `@#,5S$ E
* Created on 2007年1月1日, 下午4:44 0{zA6Xu
* !PuW6
* To change this template, choose Tools | Options and locate the template under hJasnY7
* the Source Creation and Management node. Right-click the template and choose [>xGynU0
* Open. You can then make changes to the template in the Source Editor. [X=J]e^D
*/ ptvM>zw'~g
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package com.tot.count; ~vv\A5O[|
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/** eHQ3K#M#
* FEqR7
* @author
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*/ ~ @Au <
public class CountBean { &9,<_1~
private String countType; elw}(l<F
int countId; 1h0cId8d
/** Creates a new instance of CountData */ }2i3
public CountBean() {} 5p5S_%R$e
public void setCountType(String countTypes){ =`y.L5
this.countType=countTypes; Xh*p\ $
} Kl)PF),
public void setCountId(int countIds){ {<}kqn83sT
this.countId=countIds; j@b18wZ
} i[x;k;m2q
public String getCountType(){ H;nq4;^yK
return countType; +w'{I`QIL0
} JJe?Zu\
public int getCountId(){ tE>hj:p
return countId; @vcvte
} )/1,Ogb%_
} a|\ZC\(xI
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CountCache.java i'}Z>g5D
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/* C)Ez>~Z
* CountCache.java kb>/R/,9
* >kJEa8
* Created on 2007年1月1日, 下午5:01 U]h5Q.<SG
* Q<F-l.q
* To change this template, choose Tools | Options and locate the template under jSyF]$"
* the Source Creation and Management node. Right-click the template and choose RO1xcCp
* Open. You can then make changes to the template in the Source Editor. Uhz<B #tj
*/ e2?7>?
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package com.tot.count; N>$Nw<wV
import java.util.*; i1#\S0jN
/** l'2a?1/q
* tE: m&
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* @author LOkNDmj
*/ 4Fr\=TX
public class CountCache { _=.f+1W
public static LinkedList list=new LinkedList(); |<n+6
/** Creates a new instance of CountCache */ MOIH%lpe
public CountCache() {} )D:I@`*
public static void add(CountBean cb){ aiKZ$KLC
if(cb!=null){ W]UGo,
list.add(cb); 4ZK8Y[]Lv
} v_gQCS
} 45hjN6
} +##b}?S%
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CountControl.java H?P:;1A]c
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/* L{)e1 p]q
* CountThread.java XZv(B^
* ;-d }\f ,
* Created on 2007年1月1日, 下午4:57 N%A[}Y0;MW
* 1r?<1vh:z
* To change this template, choose Tools | Options and locate the template under 24)3^1P\V
* the Source Creation and Management node. Right-click the template and choose NY'sZTM&
* Open. You can then make changes to the template in the Source Editor. }'mBqn
*/ 1A4!zqT;
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package com.tot.count; 4dXuy>Km
import tot.db.DBUtils; (>x4X@b
import java.sql.*; n#
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/** 3%]%c6
* <|NP!eMsw8
* @author ^G+1nY4?J
*/ ]w/`02w"$
public class CountControl{ iw\RQ
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private static long lastExecuteTime=0;//上次更新时间 vs/.'yD/C
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 0sv#* &0=
/** Creates a new instance of CountThread */ Lt+ Cm$3
public CountControl() {} O!}TZfC
public synchronized void executeUpdate(){ Ji_3*(
Connection conn=null; u=h:d+rq@
PreparedStatement ps=null; )z/+!y
try{ njveZav
conn = DBUtils.getConnection(); bsw0+UY=9
conn.setAutoCommit(false); XO+^q9
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); kzqW&`xn?
for(int i=0;i<CountCache.list.size();i++){ .(OFYK<
CountBean cb=(CountBean)CountCache.list.getFirst(); }1P>^I"[Y
CountCache.list.removeFirst(); _\YBB=Os
ps.setInt(1, cb.getCountId()); ab!,)^
ps.executeUpdate();⑴ PpD ?TAlA
//ps.addBatch();⑵ t<M^ /xe2
} 3%Z:B8:<