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: Q3'llOx
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CountBean.java #<fRE"v:Q
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/* cZ,b?I"Q%
* CountData.java Xg6Jh``
* 9X6h
* Created on 2007年1月1日, 下午4:44 yxPazz
* 2Ah#<k-gC;
* To change this template, choose Tools | Options and locate the template under {p2!|A&a
* the Source Creation and Management node. Right-click the template and choose +|3@=.V
* Open. You can then make changes to the template in the Source Editor. RHW]Z
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*/ AI2)g1m
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package com.tot.count; )$2QZ
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/** hPkp;a #
* =IZT(8
* @author iT+8|Yia
*/ #\{l"-
public class CountBean { E_rI?t^
private String countType; Fe*R
int countId; vO^m;['
/** Creates a new instance of CountData */ )_90UwWpj
public CountBean() {} zpn9,,~u
public void setCountType(String countTypes){ ,>a&"V^k
this.countType=countTypes; <_L,t 1H{
} qz_7%c]K[
public void setCountId(int countIds){ LBeF&sb6
this.countId=countIds; 6q\bB
} Pm6pv;WK
public String getCountType(){ K-)]
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return countType; M)Z7k/=<P
} ;fTKfa
public int getCountId(){ HQdxL*N%^
return countId; ,Zx0%#6
}
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} dlh)gp;
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CountCache.java RMV/&85?y
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/* Z?q]bSIT
* CountCache.java C}j"Qi`
* N{!i=A
* Created on 2007年1月1日, 下午5:01 5{WE~8$
* #lo6c;*m5
* To change this template, choose Tools | Options and locate the template under KfEx"94
* the Source Creation and Management node. Right-click the template and choose Y1\ }5k{>
* Open. You can then make changes to the template in the Source Editor. NG=-NxEcN
*/ :`#d:.@]o@
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package com.tot.count; /{J4:N'B>
import java.util.*; rBzuKQK}J
/** n+9=1Oo"
* *8 A
* @author /U*C\ xMm
*/ J1U/.`Oy
public class CountCache { EWhK0Vej=
public static LinkedList list=new LinkedList(); $99n&t$Y
/** Creates a new instance of CountCache */ oCv.Ln1;Z
public CountCache() {} .hb:s,0mP
public static void add(CountBean cb){ 3pROf#M
if(cb!=null){ n38p !oS
list.add(cb); wU36sCo
} ~vhE|f
} Q$W
} O:R*rJ
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CountControl.java s\(k<Ks
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/*
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* CountThread.java 76Cl\rV
* :S83vE81WK
* Created on 2007年1月1日, 下午4:57 Ta0|+IYk<
* p4rL}Jm&
* To change this template, choose Tools | Options and locate the template under ;`4&Rm9n?
* the Source Creation and Management node. Right-click the template and choose >2)OiQ`zg
* Open. You can then make changes to the template in the Source Editor.
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*/ r,3DTBe
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package com.tot.count; jOunWv|
import tot.db.DBUtils; ZQsJL\x[UK
import java.sql.*; 1=c\Rr9]
/** ZU4nc3__
* ,-c6dS
* @author \)904W5R
*/ M)+H{5bt
public class CountControl{ /Iy]DU8
private static long lastExecuteTime=0;//上次更新时间 %(#y5yJ ]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [!uG1 GJ>
/** Creates a new instance of CountThread */ U$.@]F4&
public CountControl() {} oulVg];
public synchronized void executeUpdate(){ gCS<iBT(7
Connection conn=null; DJ k/{Z:
PreparedStatement ps=null; P )"m0Lu<
try{ 2;`1h[,-^
conn = DBUtils.getConnection(); b5I I/Y
conn.setAutoCommit(false); /9*B)m"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $9#H04.x
for(int i=0;i<CountCache.list.size();i++){ 6<SAa#@ey
CountBean cb=(CountBean)CountCache.list.getFirst(); %lhEM}Sm
CountCache.list.removeFirst(); l/GGCnO/
ps.setInt(1, cb.getCountId()); 6vo;!V6
ps.executeUpdate();⑴ %nZo4hnr$r
//ps.addBatch();⑵ E0=)HTtS
} A RuA<vQ
//int [] counts = ps.executeBatch();⑶
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conn.commit(); r'r%w#=`t
}catch(Exception e){ jXx<`I+]
e.printStackTrace(); Yui3+}Ms
} finally{ 6:5I26
try{ UgNu`$m+
if(ps!=null) { {X+3;&