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: eb>jT:
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CountBean.java (B0QBDj!
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/* 1]a\uq}
* CountData.java kB9@
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* 43,baeG
* Created on 2007年1月1日, 下午4:44 ]^53Qbrv
* tGJJ|mle>
* To change this template, choose Tools | Options and locate the template under L/?jtF:o
* the Source Creation and Management node. Right-click the template and choose / ?'FSWDU
* Open. You can then make changes to the template in the Source Editor. BG8`B'i
*/ &3$FkU^F6
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package com.tot.count; * hmoi
*]:J@KGf
/** ;(@' +"
* ]E$bK
* @author >rXD Lj-e
*/ Vg~10Q
public class CountBean { '{w[).c.
private String countType; k=4C"
int countId; ^'p!#\T;H
/** Creates a new instance of CountData */ zF@[S
public CountBean() {} qVW3oj<2
public void setCountType(String countTypes){ WK5B8u*<
this.countType=countTypes; 4\E1M[ 6
} u'T?e+=
public void setCountId(int countIds){ 4_-L1WH
this.countId=countIds; /?NfU.+K
} RiZ)#0
public String getCountType(){ 22/"0=2g
return countType; ~t1?oJ
} DQ@M?~1hp
public int getCountId(){ 2f6BZ8H+Z
return countId; BvS!P8
} qr (t_qR&
} yqC158 P
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CountCache.java PqMu2 e
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/* ;`h$xB(
* CountCache.java .% +anVXS
* Y;"jsK{$
* Created on 2007年1月1日, 下午5:01 PJT$9f~3;.
* +4+czfz
* To change this template, choose Tools | Options and locate the template under i9|}-5ED
* the Source Creation and Management node. Right-click the template and choose L d{`k
* Open. You can then make changes to the template in the Source Editor. +2w<V0V_
*/ m.FN ttkM
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package com.tot.count; WRrg5&._q
import java.util.*; hC4
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/** `>GXJ~:D["
* JS/~6'uB
* @author ,Jx.Kj.,
*/ Pk;1q?tGw
public class CountCache { .X5A7 m
public static LinkedList list=new LinkedList(); F:sUGM,
/** Creates a new instance of CountCache */ 55ft,a
public CountCache() {} A2!pbeG
public static void add(CountBean cb){ M8IU[Pz4
if(cb!=null){ H<tU[U=G
list.add(cb); "xNP"S
} i91k0q*di
} 6tGF
} yg6o#;
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CountControl.java Nza@6nI"
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/* p
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* CountThread.java 6n|][! f
* _S,UpR~2W
* Created on 2007年1月1日, 下午4:57 [_`@V4
* k;K-6<^h
* To change this template, choose Tools | Options and locate the template under 0+k..l
* the Source Creation and Management node. Right-click the template and choose +R7pdi
* Open. You can then make changes to the template in the Source Editor. A-, hm=?
*/ =b8u8*ua
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package com.tot.count; c
D.;
import tot.db.DBUtils; jZH4]^De
import java.sql.*; uqD|j:~ =k
/** s@E)=;!
* Yr\quinLL
* @author j'OXT<n*
*/ At'M? Q@v
public class CountControl{ $3gM P+
private static long lastExecuteTime=0;//上次更新时间 4|4 *rhwp
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 e jR_3K^
/** Creates a new instance of CountThread */ 2PSkLS&IM
public CountControl() {} fCZ"0P3(
public synchronized void executeUpdate(){ ,J=l Hj
Connection conn=null; l;$FR4}d
PreparedStatement ps=null; f\r"7j
try{ =:t<!dp
conn = DBUtils.getConnection(); noLr185
conn.setAutoCommit(false); ; K,5qs
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); | )br-?2
for(int i=0;i<CountCache.list.size();i++){ <9\Lv]ng
CountBean cb=(CountBean)CountCache.list.getFirst(); 1]Cdfj6@
CountCache.list.removeFirst(); $$SJLV
ps.setInt(1, cb.getCountId()); C$$Zwgy
ps.executeUpdate();⑴ RR|X4h0.
//ps.addBatch();⑵ 7VskZbj\
} 6@"E*-z$
//int [] counts = ps.executeBatch();⑶ =A~5?J=
conn.commit(); 8kC$Z )
}catch(Exception e){ _~'MQ`P
e.printStackTrace(); H?FiZy*[Y
} finally{ s8 u`v1
try{ DMTc{
if(ps!=null) { q#1G4l.
ps.clearParameters(); v
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ps.close();
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ps=null; G$luGxl[
} ]o8yZ x
}catch(SQLException e){} fqBz"l>5A
DBUtils.closeConnection(conn); k!G{#(++&6
} /q8B | (U
} q(csZ\e=
public long getLast(){ v$+A! eo
return lastExecuteTime; J1w3g,
} 5s;@ ;V
public void run(){ O S#RCN*
long now = System.currentTimeMillis(); w%::~]
if ((now - lastExecuteTime) > executeSep) { Spu;
//System.out.print("lastExecuteTime:"+lastExecuteTime); l8:!{I?s=
//System.out.print(" now:"+now+"\n"); &gW<v\6,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); kd_!S[
lastExecuteTime=now; !T2{xmHKv$
executeUpdate(); $5\!ws<cZ
} DC8\v+K
else{ !&cfX/y8
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); [k75+#'
} =M9R~J!
} Qmb+%z
} ;JgSA&'e
//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 EQk omjv
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类写好了,下面是在JSP中如下调用。 wWSw0 H/
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<% xA<-'8ST
CountBean cb=new CountBean(); kM@e_YtpY
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bxO[y<|XL
CountCache.add(cb); :'xZF2
out.print(CountCache.list.size()+"<br>"); /reGT!u
CountControl c=new CountControl(); .mg0L\
c.run(); P)XR9&o':
out.print(CountCache.list.size()+"<br>"); S4c-i2Rq
%>