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: /RC7"QzL
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CountBean.java xX4N4vb
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/* p"ZG%Ow5Q]
* CountData.java v-_e)m^
* =zKM=qba
* Created on 2007年1月1日, 下午4:44 pD#rnp>WWt
* /C G"]!2 "
* To change this template, choose Tools | Options and locate the template under )f<z%:I+Z
* the Source Creation and Management node. Right-click the template and choose u^qT2Ss0
* Open. You can then make changes to the template in the Source Editor. 3x'|]Ns
*/ "5wa91*
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package com.tot.count; _t #k,;
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/** ` v@m-j6
* ~AT'[(6
* @author wT8DSq
*/ 'u |c
public class CountBean { tHwMX1 IG
private String countType; wov\kV
int countId; (rm?jDm
/** Creates a new instance of CountData */ [}0haTYc4
public CountBean() {} !NvI:C_4|
public void setCountType(String countTypes){ oHn
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this.countType=countTypes; l#Y,R 0
} ~gZLY ls
public void setCountId(int countIds){ s{\8om'-
this.countId=countIds; <s<n
} S2GxV/E
public String getCountType(){ p xa*'h"b^
return countType; PKg@[<g43
} EVC]sUT
public int getCountId(){ R3&Iu=g
return countId; 54R#W:t
} DjQFi
} '=8d?aeF
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CountCache.java xH"/1g
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/* 41?HY{&2
* CountCache.java )g#T9tx2D
* !/i{l
* Created on 2007年1月1日, 下午5:01 l$pm_%@2]
* Ata:^qI
* To change this template, choose Tools | Options and locate the template under +V046goX W
* the Source Creation and Management node. Right-click the template and choose 9} M?P
* Open. You can then make changes to the template in the Source Editor. ?:I* 8Fj
*/ hVAn>_(
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package com.tot.count; "2$fi{9
import java.util.*; _
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/** o5uph=Q{
* ""F5z,'
* @author 'UX!*5k<:
*/ [H^z-6x:0
public class CountCache { 9oR@UW1
public static LinkedList list=new LinkedList(); ^sEYOX\
/** Creates a new instance of CountCache */ tKx~1-
public CountCache() {} 4`]^@"{
public static void add(CountBean cb){ }1i`6`y1
if(cb!=null){ e9 5Lo+:f
list.add(cb); ipgC RHE
} jaMjZp;{(
} Pz |>"'
} A,hJIe
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CountControl.java udUyh%n
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/* )SRefW.v
* CountThread.java QP8Ei~
* ujq=F
* Created on 2007年1月1日, 下午4:57 9gEwh<
* ?;+1)> {
* To change this template, choose Tools | Options and locate the template under )E@.!Ut4o
* the Source Creation and Management node. Right-click the template and choose 1AfnzGvA
* Open. You can then make changes to the template in the Source Editor. e~[/i\
*/ (X1e5j>Ru
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package com.tot.count; |w1Bq
import tot.db.DBUtils; Qu"\wE^.`
import java.sql.*; ag#S6E^%S
/**
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* ith
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* @author foF({4q7b^
*/ eH3JyzzP,
public class CountControl{ aS{n8P6vW
private static long lastExecuteTime=0;//上次更新时间 k,E{C{^M
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2"kLdD
/** Creates a new instance of CountThread */ 3kIN~/<R+7
public CountControl() {} otl0JHt*+
public synchronized void executeUpdate(){ RO VW s/
Connection conn=null; % X+:o]T
PreparedStatement ps=null; k_qd|
try{ J^nBdofP
conn = DBUtils.getConnection(); 6]_pIf
conn.setAutoCommit(false); ]kG"ubHV?h
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); V2?=4mb
for(int i=0;i<CountCache.list.size();i++){ #ASz;$P
CountBean cb=(CountBean)CountCache.list.getFirst(); U;V7 u/{
CountCache.list.removeFirst(); 9T}pT{~V
ps.setInt(1, cb.getCountId()); uK#4(eY=W
ps.executeUpdate();⑴ gA5/,wDO
//ps.addBatch();⑵ ] =xE
} 7he,?T)vD
//int [] counts = ps.executeBatch();⑶ T`.O'!
conn.commit(); Lh"<XYY
}catch(Exception e){ f/NH:1)y
e.printStackTrace(); w%VU/6~
} finally{ 6C^
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try{ ?m=N]!n
if(ps!=null) { :O?MSS;~
ps.clearParameters(); |vwVghC
ps.close(); *_{j=sd
ps=null; MS>Ge0P("~
} u\x}8pn
}catch(SQLException e){} P*Uwg&Qz)
DBUtils.closeConnection(conn); OwUhdiG
} 5\sd3<:+
} +L|?~p`V
public long getLast(){ /y#f3r+*2
return lastExecuteTime; %@ODs6 R0
} mpEK (p
public void run(){ p2[n$61
long now = System.currentTimeMillis(); _476pZ_
if ((now - lastExecuteTime) > executeSep) { N/'b$m5=
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//System.out.print("lastExecuteTime:"+lastExecuteTime); >~sI8czR*
//System.out.print(" now:"+now+"\n"); ZW8vza
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Y3cMC)
lastExecuteTime=now; ;Ax
}KN7
executeUpdate(); {G0T$,'DR
} ks qQM
else{ `$<.pOm
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); m
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} Nk
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} 7Lc]HSZo,
} )?naN
//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 o>i4CCU+
B6As,)RjD:
类写好了,下面是在JSP中如下调用。
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<% V)-+Fd,=
CountBean cb=new CountBean(); V-2(?auZd
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); '$IKtM`L
CountCache.add(cb); D~fl JR
out.print(CountCache.list.size()+"<br>"); f:,DWw`B
CountControl c=new CountControl(); I-)+bV
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c.run(); L>NL:68yN
out.print(CountCache.list.size()+"<br>"); YnS#H"
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