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: eqZ V/a
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CountBean.java owmV7E1
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/* h-<('w:A
* CountData.java 1bYc^(z0
* +Z/*=;
* Created on 2007年1月1日, 下午4:44 ^0pd- n@pn
* VI74{='=
* To change this template, choose Tools | Options and locate the template under :JV=Kt
* the Source Creation and Management node. Right-click the template and choose Owo2DsT t
* Open. You can then make changes to the template in the Source Editor. t*NZ@)>
*/ w;&J._J
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package com.tot.count; 5T:e4U&
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/** x5.HdKV
* Rd&2mL
* @author ZMt9'w;
*/ -iR}kP|
public class CountBean { O7g
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private String countType; <wW#Wnc ]
int countId; P5P:_hr
/** Creates a new instance of CountData */ l"W9uS;\T
public CountBean() {} }/4 AT
public void setCountType(String countTypes){ 3PIZay
this.countType=countTypes; ?k TVC
} }cn46L%/
public void setCountId(int countIds){ `J'xVq#O
this.countId=countIds; *l)_&p
} ?S~HnIn
public String getCountType(){ dPc*!xrq
return countType; }JeGjpAcV
} g"EvMv&
public int getCountId(){ 4&r[`gL
return countId; Xx~OZ^t&Vn
} hxP%m4xF +
} WldlN?[j
}rj.N98
CountCache.java 4c_TrNwP
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/* =ps3=D
* CountCache.java 9.{u2a\
* 9E'fM
* Created on 2007年1月1日, 下午5:01 P(l$5x]g,
* B5GT^DaT
* To change this template, choose Tools | Options and locate the template under JF!JY( U,
* the Source Creation and Management node. Right-click the template and choose Ew5(U`]
* Open. You can then make changes to the template in the Source Editor. j1Fy'os"!
*/ uUB,OmLN
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package com.tot.count; Dq/_^a/1
import java.util.*; )a
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/** -*~= 4m<
* Dt%Gv0
* @author \T`InBbf
*/
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public class CountCache { >v7fR<(%s
public static LinkedList list=new LinkedList(); 5^<X:1J$
/** Creates a new instance of CountCache */
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public CountCache() {} 9utiev~3
public static void add(CountBean cb){ ![h+R@_(
if(cb!=null){ pM],-7UM
list.add(cb); 'r~,~AI
} IFcxyp
} jfP2n5X83
} \3JZ=/
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CountControl.java %X7R_>.
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/* d[E~}Dq3#
* CountThread.java #?\$*@O
* $M{MOehZ
* Created on 2007年1月1日, 下午4:57 4QC"|<9R
* >L\$
* To change this template, choose Tools | Options and locate the template under ,V1/(|[h
* the Source Creation and Management node. Right-click the template and choose a8ya5EO
* Open. You can then make changes to the template in the Source Editor. 0zQ"5e?qy
*/ U_i%@{
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package com.tot.count; Rah"La
import tot.db.DBUtils; @ x_.
import java.sql.*; 3#N'nhUzA
/** 1/X@~
* r<VZEbm)
* @author Oxo?\
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*/ #hG0{_d7
public class CountControl{ C))5,aX
private static long lastExecuteTime=0;//上次更新时间 `B6*wE-|
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 7ss Y*1b
/** Creates a new instance of CountThread */ ,I6jfXI4
public CountControl() {} K.) ionb
public synchronized void executeUpdate(){ uu ahR
Connection conn=null; jr[(g:L
PreparedStatement ps=null; )[fjZG[
try{ [Jv0^"]
conn = DBUtils.getConnection(); "yaz!?O>
conn.setAutoCommit(false); EQ
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); B7PkCS&X
for(int i=0;i<CountCache.list.size();i++){ \|e>(h!l;
CountBean cb=(CountBean)CountCache.list.getFirst(); `_%UK=m
CountCache.list.removeFirst(); _gU:!:}
ps.setInt(1, cb.getCountId()); 8Na.H::cZ
ps.executeUpdate();⑴ <;Q1u,Mc
//ps.addBatch();⑵ @Wgd(Ezd
} Lzmdy0!'
//int [] counts = ps.executeBatch();⑶ f@S n1c,Mk
conn.commit(); er@"4R0
}catch(Exception e){ ?QA![
e.printStackTrace(); F6
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