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: ({r*=wAP
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CountBean.java $+JS&k/'m
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/* Q?b14]6im
* CountData.java /1N6X.Zb
* $YxBE`)d-
* Created on 2007年1月1日, 下午4:44 j#r6b]k(Hv
* {]_uMg#!
* To change this template, choose Tools | Options and locate the template under d)f@ 5/<
* the Source Creation and Management node. Right-click the template and choose 1 `^Rdi0
* Open. You can then make changes to the template in the Source Editor. ]aP=Ks%
*/ :x.7vZzxs
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package com.tot.count; \B F*m"lz
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/** '* mH*?Y
* !+>v[(OzM
* @author A?_ =K
*/ ZkL8 e
public class CountBean { ]]7mlQ
private String countType; O[tvR:Nh
int countId; f-DL:@crU
/** Creates a new instance of CountData */ Jk@]tAwoM
public CountBean() {} 7C#`6:tI
public void setCountType(String countTypes){ {3;AwhN0H
this.countType=countTypes; &'cL%.
} vEf4HZ&w
public void setCountId(int countIds){ hfpJ+[
this.countId=countIds; XL#[%X9
} {{V8;y
public String getCountType(){ !cKz7?w
return countType; =qN2Xg/
} rpeJkG@+
public int getCountId(){ SJD@&m%?[
return countId; u\&b4=nL
} 8!.ojdyn
} U*90m~)
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CountCache.java V5+SWXZ
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/* A-:O`RK
* CountCache.java 5F`;yh+e
* KiG p[eb
* Created on 2007年1月1日, 下午5:01 ;&H4u)
* z/i+EE
* To change this template, choose Tools | Options and locate the template under dJ$"l|$$
* the Source Creation and Management node. Right-click the template and choose YK|bXSA[
* Open. You can then make changes to the template in the Source Editor. }VDqj}is
*/ s4&^D<
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package com.tot.count; 3?Y 2L
import java.util.*; o7IxJCL=Q
/** U,nEbKJgk
* 5 ae2<Y=
* @author THmb6^
*/ /}-CvSR
public class CountCache { ySI~{YVM
public static LinkedList list=new LinkedList(); J2uZmEt
/** Creates a new instance of CountCache */ N !TW!
public CountCache() {} v[Kxja;
public static void add(CountBean cb){ Da"j E
if(cb!=null){ kdGT{2u
list.add(cb); Z7 E
} 9"g6C<
} &89oO@5
} +V&{*f)
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CountControl.java T#bu
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/* Web|\CH
* CountThread.java 7FRmx4(!
* IIq1\khh
* Created on 2007年1月1日, 下午4:57 ;sHN/eF
* >>[G1
* To change this template, choose Tools | Options and locate the template under #s!'+|2n
* the Source Creation and Management node. Right-click the template and choose aL\nT XakX
* Open. You can then make changes to the template in the Source Editor. j <o3JV
*/ p!s}=wI`
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package com.tot.count; T?4G'84nN
import tot.db.DBUtils; 8i?l02
import java.sql.*; .7n\d55a
/** *Vho?P6y\Y
* y-CX}B#j
* @author 41fJ%f`
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*/ *5xJv
public class CountControl{ 6Zn
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private static long lastExecuteTime=0;//上次更新时间 4b:s<$TZ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2B,] -Mu)
/** Creates a new instance of CountThread */ dx;k`r$w
public CountControl() {} +iI&c
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public synchronized void executeUpdate(){ `9 {mr<
Connection conn=null; hR.@b*q?R
PreparedStatement ps=null; L<fvKmo(fw
try{ 6 PxW8pn
conn = DBUtils.getConnection(); }x&N^Ky3c
conn.setAutoCommit(false); w9|w2UK
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n`4K4y%Dy}
for(int i=0;i<CountCache.list.size();i++){ ;[a|9TPR
CountBean cb=(CountBean)CountCache.list.getFirst(); *28pRvY:b
CountCache.list.removeFirst(); `c'W-O/
ps.setInt(1, cb.getCountId()); Y6&wJ<
ps.executeUpdate();⑴
^ :F.
//ps.addBatch();⑵ e)?Fi
} uPniLx\t:
//int [] counts = ps.executeBatch();⑶ ncx(pp
conn.commit(); J/3_C6UZ
}catch(Exception e){ Pzb|t+"$
e.printStackTrace(); t+Op@*#%
} finally{ }6 K^`!
try{ ~@kU3ZGJZ
if(ps!=null) { oHs2L-G
ps.clearParameters(); .$#rV?7
ps.close(); ,k G>?4
ps=null; mg,j:,
} 8#Q$zLK42N
}catch(SQLException e){} Oez>X=Xf
DBUtils.closeConnection(conn); Ye.r%i&