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: fncwe ';?
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CountBean.java 2vh!pez_
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/* (:fE _H2z
* CountData.java zCGmn& *M
* 7+D'W7Yx
* Created on 2007年1月1日, 下午4:44 j^aQ>(t(9
* D)O6|DiO
* To change this template, choose Tools | Options and locate the template under GqIvvnw@f
* the Source Creation and Management node. Right-click the template and choose _ pH6uuB
* Open. You can then make changes to the template in the Source Editor. A5.'h<
*/ (.quX@w"m
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package com.tot.count; /v
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/** /SPAJHh
* 3I>S:|=K
* @author (v'lb!j^#
*/ _Y
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public class CountBean { 0'\FrG
private String countType; [KimY
int countId; < o'7{
/** Creates a new instance of CountData */ p+`*~6Jj/
public CountBean() {} '.h/Y/oz
public void setCountType(String countTypes){ ir@N>_
this.countType=countTypes; f1]AfH#
} "#\bQf}
public void setCountId(int countIds){ A=qW]Im
this.countId=countIds; 3'sWlhf;
} Ghq'k:K,
public String getCountType(){ 2=Y_Qrhi
return countType; 1(:=jOfk
} rd"]@~v1
public int getCountId(){ Ltic_cjYd?
return countId; $Va]vC8?
} }lNufu
} Zm;
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CountCache.java ~kj(s>xP
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/* f<> YYeY
* CountCache.java o.
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* ,
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* Created on 2007年1月1日, 下午5:01 ,a]~hNR*X
* g]iy-,e
* To change this template, choose Tools | Options and locate the template under Y%CL@G60
* the Source Creation and Management node. Right-click the template and choose 5>1Y="B
* Open. You can then make changes to the template in the Source Editor. u'~b<@wHB
*/ >uPde5"ZF-
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package com.tot.count; y`B!6p
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import java.util.*; VI|DMx
/** $p6Xa;j$ 9
* TJw.e/
* @author Pu%>j'A
*/ uDE91.pUkr
public class CountCache { Sj{rvW
public static LinkedList list=new LinkedList(); @'<j!CqQ
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/** Creates a new instance of CountCache */ 1[gjb((
public CountCache() {} P{i8
public static void add(CountBean cb){ <k-@R!K~JC
if(cb!=null){ U70@}5!
list.add(cb); R8r[;u\iV
} H`6Jq?\
} l LD)i J1
} ,Y\4xg*`
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CountControl.java ^$Eiz.
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/* B> "r -O
* CountThread.java ,~N+?k_
* [;CqvD<S
* Created on 2007年1月1日, 下午4:57 oIL+@}u7
* v/TlXxfil
* To change this template, choose Tools | Options and locate the template under ik:)-GV;s
* the Source Creation and Management node. Right-click the template and choose 3~3(G[w
* Open. You can then make changes to the template in the Source Editor. dI0>m:RBz
*/ hA,rSq
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package com.tot.count; iJaNP%N
import tot.db.DBUtils; %}]4Nsd e
import java.sql.*; i8[Y{a*
/** CTbhwY(/
* Tk#&Ux{ZJ
* @author 1-]x
*/ nhXp_Z9
public class CountControl{ `1d`9AS2g
private static long lastExecuteTime=0;//上次更新时间 /qhm9~4e3
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 .Qi1I
/** Creates a new instance of CountThread */ zc,9Qfn
public CountControl() {} %qjyk=z+Z
public synchronized void executeUpdate(){ seV;f^-hR
Connection conn=null; &CeF^
PreparedStatement ps=null; ::72~'tw
try{ >yT@?!/Q>'
conn = DBUtils.getConnection(); zm3MOH^a
conn.setAutoCommit(false); ~lalc ^
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <,cIc]eX
for(int i=0;i<CountCache.list.size();i++){ \,bFm,kC?
CountBean cb=(CountBean)CountCache.list.getFirst(); Y %D*O
CountCache.list.removeFirst(); >A(?P n{|a
ps.setInt(1, cb.getCountId()); qT>&
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ps.executeUpdate();⑴ wR<QeH'V
//ps.addBatch();⑵ :-WCW);N
} dt0E0i
//int [] counts = ps.executeBatch();⑶ `~+a=Q
conn.commit(); O7'^*"S
}catch(Exception e){ QGz3id6
e.printStackTrace(); pQMpkAX
} finally{ xEZVsz
try{ @61N[
if(ps!=null) { _BLSI8!N@
ps.clearParameters(); >5vl{{,$K
ps.close(); er7/BE&
ps=null; -"dy z(
} |9"^s x
}catch(SQLException e){} ]-Y]Q%A4
DBUtils.closeConnection(conn); Rb}&c)4
} ^`r|3c0
} ![hhPYmV
public long getLast(){ _DvPF~
return lastExecuteTime; G8DIig<
} ,bwopRcA
public void run(){ AFB 7s z
long now = System.currentTimeMillis(); ?NzeP?g
if ((now - lastExecuteTime) > executeSep) { .L{+O6*c
//System.out.print("lastExecuteTime:"+lastExecuteTime); nIKT w
//System.out.print(" now:"+now+"\n"); dVtLYx
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); qjEWk."
lastExecuteTime=now; k+GK1Yl
executeUpdate(); 2#A9D.- h
} ,lS-;.
else{ y~ 4nF
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 7(USp#"
} d8
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} O+Lb***b"
} 5b4V/d*
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//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 . .je<
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类写好了,下面是在JSP中如下调用。 rbZ6V :
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<% Vh9s.=*P@
CountBean cb=new CountBean(); #~-&&S4a.J
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); CJtjn
CountCache.add(cb); `1}?{ud
out.print(CountCache.list.size()+"<br>"); `iayh
CountControl c=new CountControl(); wOkJ:k
c.run(); l=?y=2+
out.print(CountCache.list.size()+"<br>"); =2)$|KC
%>