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: uN&49o
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CountBean.java mqQ//$Y
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/* AQ-R^kT
* CountData.java O sIvW'$\
* &53LJlL
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* Created on 2007年1月1日, 下午4:44 G*VcAJ[
* Yu%ZwTvw
* To change this template, choose Tools | Options and locate the template under A*{V%7hs&
* the Source Creation and Management node. Right-click the template and choose r2;+ACwWf_
* Open. You can then make changes to the template in the Source Editor. ;>p{|^X0D
*/ *=QWx[K|
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package com.tot.count; Yv;iduc('
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/** &-.2P!t
* !"^//2N+,
* @author +_fxV|}P
*/ 7baQ4QY?n
public class CountBean { y#{> tC
private String countType; LZpqv~av
int countId; u_)'}
/** Creates a new instance of CountData */ k8sjW!2
public CountBean() {} 'k$j^|r>
public void setCountType(String countTypes){ -[lOf
this.countType=countTypes; DTV"~>@
} !_1RQ5]^
public void setCountId(int countIds){ vP&JL~
this.countId=countIds; d>Np; "
} ]+78
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public String getCountType(){ \R#OJ=F
return countType; ~p/1
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} #c1c%27cmm
public int getCountId(){ dBp)6ok#c
return countId; [%6"UH
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} [)p>pA2GZj
} I_h&35^t
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CountCache.java ON3~!Q)
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/* z/S}z4o/
* CountCache.java bu r0?q
* ]$WwPDZ
* Created on 2007年1月1日, 下午5:01 $]]|#}J
* <bOi }
* To change this template, choose Tools | Options and locate the template under $~.'Tnk)
* the Source Creation and Management node. Right-click the template and choose >BlF<
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* Open. You can then make changes to the template in the Source Editor. n|I5ylt
*/ [[0u|`T/
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package com.tot.count; h.h\)>DM@
import java.util.*; |Xk>a7X
/** odpjEeQC
* vZt48g
* @author >*goDtTjp
*/ 0W>,RR)
public class CountCache { ?,x3*'-(
public static LinkedList list=new LinkedList(); }EWPLJA
/** Creates a new instance of CountCache */ kEM|;&=_
public CountCache() {} uY|-: =
public static void add(CountBean cb){ =ET |h}I
if(cb!=null){ Wi{ jC?2Q
list.add(cb); EJ`"npU
} wtnC^d$
} Bgj^n{9x
} UgZuEfEGve
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CountControl.java ).1F0T
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/* YeCS`IXm
* CountThread.java :HQQ8uQfb
* x.~A vJ
* Created on 2007年1月1日, 下午4:57 }0~4Z)?e3
* x\R
8W8M
* To change this template, choose Tools | Options and locate the template under .:=G=v=1
* the Source Creation and Management node. Right-click the template and choose .+ g8zbD4
* Open. You can then make changes to the template in the Source Editor. mXXU{IwUe
*/ g
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package com.tot.count; .a`(?pPr,
import tot.db.DBUtils; jUCrj'
import java.sql.*; u'+;/8
/** 6#/v:;bF
* f+Ht
* @author W #kOcw
*/ R<n'v.~"A
public class CountControl{ xF8^#J6>
private static long lastExecuteTime=0;//上次更新时间 0'0GAh2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I7q}<"`
/** Creates a new instance of CountThread */ tjTnFP/=
public CountControl() {} i@p0Jnh|
public synchronized void executeUpdate(){ Dm0Ts~
Connection conn=null; +:?"P<'
PreparedStatement ps=null; }grel5lq
try{ )4BLm
conn = DBUtils.getConnection(); VwrHD$
conn.setAutoCommit(false); V*w~Sr%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); G :JQ_w
for(int i=0;i<CountCache.list.size();i++){ Dq G m
CountBean cb=(CountBean)CountCache.list.getFirst(); R9`37(c9+
CountCache.list.removeFirst(); ' (1`iQ;
ps.setInt(1, cb.getCountId()); iy\ 6e k1
ps.executeUpdate();⑴ .~t.B!rVSB
//ps.addBatch();⑵ {gwJ>]z"e
} Xe7/
//int [] counts = ps.executeBatch();⑶ YA[\|I33
conn.commit(); 0<C]9[l
}catch(Exception e){ &@h(6
e.printStackTrace(); QlCs,bT
} finally{ aBonq]W
try{ .>Fy ]Cqoh
if(ps!=null) { r0fxEYze&
ps.clearParameters(); yO`HL'SMo
ps.close(); 85GU~.
ps=null; C=>IJ'G
} K{WLo5HP
}catch(SQLException e){} yz7X7mAo
DBUtils.closeConnection(conn); yhSbX4Q
} lqoJ2JMy
} --chU5
public long getLast(){ +1o4l i
return lastExecuteTime; T>2_ r6;
} `8sC>)lrwu
public void run(){ ]d]rV
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long now = System.currentTimeMillis(); 3q*p#l~
if ((now - lastExecuteTime) > executeSep) { Uop`)
//System.out.print("lastExecuteTime:"+lastExecuteTime); sOUQd-!"
//System.out.print(" now:"+now+"\n"); nWz7$O
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;S.o`z1GI
lastExecuteTime=now; kzuI<DW
executeUpdate(); Ufr,6IX
} s7>a
else{ A4>j4\A[M
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (764-iv(
} 82*nC!P3E
} o3OtG#g2
} 9O2??N7f
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 _aj,tz
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