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: 7'i#!5
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CountBean.java OP`Jc$|6
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/* [Am`5&J
* CountData.java Wk#h,p3
* E8_Le
* Created on 2007年1月1日, 下午4:44 R{uJczu
* ttFY
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* To change this template, choose Tools | Options and locate the template under aq+IC@O
* the Source Creation and Management node. Right-click the template and choose {lTxB'W@d
* Open. You can then make changes to the template in the Source Editor. E? eWv)//
*/ D?yE$_3>c
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package com.tot.count; xVkTRCh
@ Rx6 >52>
/** 7X{bB
* Fiu!!M6
* @author *Ht*)l?
*/ #3K,V8(
public class CountBean { R G0S
private String countType; ] @)!:<+
int countId; ,{{#a*nd
/** Creates a new instance of CountData */ .blft,'
public CountBean() {} p/k<wCm6
public void setCountType(String countTypes){ 6UW:l|}4#2
this.countType=countTypes; U M( l%
} $HBT%g@UN
public void setCountId(int countIds){ =^Sw*[eiy
this.countId=countIds; 3g0u#t{
} !ASoXQRz
public String getCountType(){ b-BM"~N'
return countType; #PslrA.
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} nx-1*
public int getCountId(){ h;%i/feFg
return countId; f `y"
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} NSS4vtA
} Du^x=;
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CountCache.java )
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/* HkdN=q
* CountCache.java #7] o6
* z|3`0eWIG
* Created on 2007年1月1日, 下午5:01
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* <mZrR3v'D
* To change this template, choose Tools | Options and locate the template under to&N22a$
* the Source Creation and Management node. Right-click the template and choose \5Vp6^
* Open. You can then make changes to the template in the Source Editor. %6A-OF
*/ [A"H/Qztk
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package com.tot.count; 7|QGY7Tf
import java.util.*; 5#0A`QO
/** 0R@g(
* #vj#! 1
* @author $ZI~ 8rI~
*/ _Z+jQFKJ\8
public class CountCache { \Pl,'
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public static LinkedList list=new LinkedList(); hdd>&?p3
/** Creates a new instance of CountCache */ @PQrmn6w
public CountCache() {} 5S%C~iB
public static void add(CountBean cb){ D3S+LV
if(cb!=null){ R:w%2Y
list.add(cb); ImWXzg3@{
} EO#gUv
} Fn86E dFM
} h; 'W :P
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CountControl.java )L |tn
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/* ORowx,(hX
* CountThread.java 4%wq:y<
)/
* $D QD$
* Created on 2007年1月1日, 下午4:57 xLx"*jyL
* K2cq97k,d
* To change this template, choose Tools | Options and locate the template under 8jy-z"jc
* the Source Creation and Management node. Right-click the template and choose 3sZ,|,ueD
* Open. You can then make changes to the template in the Source Editor. >Hih
*/ g/IH|Z=A
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package com.tot.count; )A="eW_>
import tot.db.DBUtils; 9&jQ
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import java.sql.*; f}[H
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/** #P(l2 (
* ~ J0,)_b%*
* @author 99^AT*ByY
*/ 2)wAFO6u
public class CountControl{ lPY@{1W
private static long lastExecuteTime=0;//上次更新时间 ,b4):{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 S:ls[9G[3
/** Creates a new instance of CountThread */ 9i0M/vx
public CountControl() {} LZ~2=Y<
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public synchronized void executeUpdate(){ TdQ]G2
Connection conn=null; :T_'n,
PreparedStatement ps=null; |d
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try{ =G(*gx
conn = DBUtils.getConnection(); `#ul,%
conn.setAutoCommit(false); EdEoXY-2
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Kb-W
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for(int i=0;i<CountCache.list.size();i++){ xC-BqVJ%_T
CountBean cb=(CountBean)CountCache.list.getFirst(); XwcMt r*
CountCache.list.removeFirst(); NMXnrvS&
ps.setInt(1, cb.getCountId()); i{8]'fM
ps.executeUpdate();⑴ ql^g~b
//ps.addBatch();⑵ :.#z
} 7p^@;@V
//int [] counts = ps.executeBatch();⑶ -b
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conn.commit(); Bc@30KiQ^
}catch(Exception e){ [s~JceUyX
e.printStackTrace(); k({2yc#RD&
} finally{ 2\VAmPG.Zs
try{ AHwG<k
if(ps!=null) { lR:?uZ$
ps.clearParameters(); , jy<o+!
ps.close(); R'SBd}1
ps=null; ^|#>zCt^
} Y]N~vD
}catch(SQLException e){} eOt%x Tx
DBUtils.closeConnection(conn); YZ+>\ x
} VJDoH
} |8H_-n
public long getLast(){ ;7rd;zJ
return lastExecuteTime; d<x1*a
} @lS==O-`f
public void run(){ <FUon
long now = System.currentTimeMillis(); 87i"
if ((now - lastExecuteTime) > executeSep) { 7:>sc]Z
//System.out.print("lastExecuteTime:"+lastExecuteTime); )CLf;@1
//System.out.print(" now:"+now+"\n"); .s2$al
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;WD,x:>blO
lastExecuteTime=now; {)xWD%
executeUpdate(); GW3>&j_!d
} w$j{Hp6m
else{ DzC Df@TB"
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 6\4Z\82
} HY ;9?KJ'
} CbOCk:,g5
} Stxp3\jEn
//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 q\Rq!7(
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类写好了,下面是在JSP中如下调用。 ;3;2h+U*
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<% X4wH/q^
CountBean cb=new CountBean(); :"<e0wDu[
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @'i+ff\
CountCache.add(cb); M+poB+K.
out.print(CountCache.list.size()+"<br>"); <~{du ?4n
CountControl c=new CountControl(); *%\mZ,s"
c.run(); 2no$+4+z
out.print(CountCache.list.size()+"<br>"); uvnI>gv
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