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: R=NK3iGT f
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CountBean.java !9C]Fs*`?
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/* >4lA+1JYk
* CountData.java ]C_$zbmi
* /#x0?d{5
* Created on 2007年1月1日, 下午4:44 ;cv\v(0
* )1 0aDTlr
* To change this template, choose Tools | Options and locate the template under QSYKYgxC
* the Source Creation and Management node. Right-click the template and choose `+(JwQC4
* Open. You can then make changes to the template in the Source Editor. =6'D/| 3
*/ $xcU*?=K
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package com.tot.count; >\Iy <M
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/** 5n2}|V$VqP
* a,t]> z95
* @author t(^Lh.<a
*/ {y!77>Q/
public class CountBean { rj eKG-Z@
private String countType; :n}t7+(>U
int countId; UD'e%IVw
/** Creates a new instance of CountData */ f,+ONV]5Tt
public CountBean() {} (aq^\#9btO
public void setCountType(String countTypes){ XKBQH(
this.countType=countTypes; fJ-8$w\uL
} t2-bw6U
public void setCountId(int countIds){ Ga"<qmLMc
this.countId=countIds; Zg;Ht
} bu\D*-
public String getCountType(){ Wf
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return countType; wqn}t]
} wGpw+O
public int getCountId(){ y?s#pSX;N
return countId; l0wvWv*k
} f;W>:`'
} BjUz"69
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CountCache.java KMkX0+Ao
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/* J@9E20$
* CountCache.java <Y#EiC.
* x6~`{N1N
M
* Created on 2007年1月1日, 下午5:01 / ='/R7~
* z:tu_5w!,
* To change this template, choose Tools | Options and locate the template under k@C]~1
* the Source Creation and Management node. Right-click the template and choose gl6 *bB=
* Open. You can then make changes to the template in the Source Editor. Y4/ !b
*/ 8:UV; 5@
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package com.tot.count; 2fJ2o[v
import java.util.*; SJI+$L\'
/** D)LqkfJ}z^
* CbRl/ 68HY
* @author 852Bh'u_
*/ Qte'f+
public class CountCache { `ZAGseDd~
public static LinkedList list=new LinkedList(); Y'i_EX|
/** Creates a new instance of CountCache */ @7B!(Q
public CountCache() {} .zyi'Kj
public static void add(CountBean cb){ y>m=A41:g
if(cb!=null){
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list.add(cb); yu62$d
} 9k!#5_ M
} (A8X|Y
} `_&7-;)i*\
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CountControl.java {-Y% wM8<i
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/* GCPSe A~cx
* CountThread.java HveOG$pT
* DJhCe==$v
* Created on 2007年1月1日, 下午4:57 Mi"dFx^Md
* E MKv)5MH
* To change this template, choose Tools | Options and locate the template under du4Q^-repC
* the Source Creation and Management node. Right-click the template and choose KrT+Svm
* Open. You can then make changes to the template in the Source Editor. H23-%+*J
*/ -^LEGKN
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package com.tot.count; }<kpvd+ps=
import tot.db.DBUtils; m-No 8)2yA
import java.sql.*; 7[W!Nx
/** Rm!Iv&{
* @RF!p
* @author x+7jJ=F
*/ gG.b=DvzY
public class CountControl{ 3 aG?^z
private static long lastExecuteTime=0;//上次更新时间 g&V1<n\b+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 <}$o=>'
/** Creates a new instance of CountThread */ 8wqHr@}p
public CountControl() {} sP5\R#
public synchronized void executeUpdate(){ QGnBNsA h
Connection conn=null; q.>{d%?
PreparedStatement ps=null; pTlNJ!U>
try{ Ey!+rq}
conn = DBUtils.getConnection(); thjCfP
conn.setAutoCommit(false); *L.+w-g&&
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <M|kOi
for(int i=0;i<CountCache.list.size();i++){ ca1A9fvo
CountBean cb=(CountBean)CountCache.list.getFirst(); AA$-Lx(UJk
CountCache.list.removeFirst(); dRXF5Ox5K}
ps.setInt(1, cb.getCountId()); 1x#Z}XG
ps.executeUpdate();⑴ hqVFb.6[
//ps.addBatch();⑵ H`;q@
} Fh4kd>1D
//int [] counts = ps.executeBatch();⑶ a$SGFA}V
conn.commit(); 14p <0BG
}catch(Exception e){ fWywegh
e.printStackTrace(); 0x\bDWZ_
} finally{ gUB%6v G\I
try{ -&*
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if(ps!=null) { SablF2doa
ps.clearParameters(); q8{)27f,
ps.close(); C-abc+/
ps=null; gzthM8A
} ?HBNd&gZ1G
}catch(SQLException e){} 0;j)rmt
DBUtils.closeConnection(conn); ~P85Or
} hYMo5 ?
} V!F#
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public long getLast(){ <m#ov G6
return lastExecuteTime; "$*&bC#dE
} B#_<?
public void run(){ Vs)Pg\B?
long now = System.currentTimeMillis(); #?Z>o16,u
if ((now - lastExecuteTime) > executeSep) { rn7eY
//System.out.print("lastExecuteTime:"+lastExecuteTime); {]/}3t
//System.out.print(" now:"+now+"\n"); %(,Kj
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); XP"lqyAi
lastExecuteTime=now; =r=YV-D.
executeUpdate(); <T[wZ[l
} [kIiKLX
else{ ZzNp#FrX"
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); x4PA~R
} |<l
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} :O}= $[
} Ccld;c&+
//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 m?]XNgT
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类写好了,下面是在JSP中如下调用。 )
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<% |^^'GZ%a
CountBean cb=new CountBean(); _H9.AI
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \YE(E04w57
CountCache.add(cb); B 3Y,|*
out.print(CountCache.list.size()+"<br>"); ?32gug\i'}
CountControl c=new CountControl(); iX]Vkx
c.run(); A~_*vcz
out.print(CountCache.list.size()+"<br>"); "&s9;_9
%>