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: ")i)vXF'
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CountBean.java =d^hiR!GN
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/* o ^UOkxs.
* CountData.java 4aBVO%t
* ppvlU H5;
* Created on 2007年1月1日, 下午4:44 Komdz/g
* }s<;YC
* To change this template, choose Tools | Options and locate the template under ?z l<"u
* the Source Creation and Management node. Right-click the template and choose -wV2
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* Open. You can then make changes to the template in the Source Editor. iz`>'wpC
*/ hB.8\-}QMq
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package com.tot.count; @!!u>1
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/** ,iP
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* 2 A!*8w
* @author H8? Y{H
*/ xp95KxHHo
public class CountBean { S!=R\_{u$
private String countType; 5=
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int countId; Y8v[kuo7
/** Creates a new instance of CountData */ xlwf @XW
public CountBean() {} T:{r*zLSN
public void setCountType(String countTypes){ F9K0
this.countType=countTypes; (P-^ PNz&
} PLs`Ci|`
public void setCountId(int countIds){ tR'RB@kJ
this.countId=countIds; M`'DD-Q
} a<r,LE
public String getCountType(){ ez[x8M>
return countType; a_5s'Dh
} {Oy|c
public int getCountId(){ "%^_.Db>|
return countId;
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} 6#CswSpS
} J.4U;A5
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CountCache.java }l$zZ>.\H
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/* [y'blCb
* CountCache.java N'EZJoH
* q/I( e
* Created on 2007年1月1日, 下午5:01 ;2`6eyr
* dB4ifeT]
* To change this template, choose Tools | Options and locate the template under -A
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* the Source Creation and Management node. Right-click the template and choose mL`8COA
* Open. You can then make changes to the template in the Source Editor. ,IboPh&Q78
*/ E#rQJ
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package com.tot.count; ,s3|
import java.util.*; 6&SNFOX{@
/** zytN leyc
* \z !lw
* @author m6BUKX\m
*/ Ii[U%
public class CountCache { ;u'VR}4ph
public static LinkedList list=new LinkedList(); MW rhVn{R
/** Creates a new instance of CountCache */ ]ASw%Lw)
public CountCache() {} 95@u|#n
public static void add(CountBean cb){ ZOV,yuD{8{
if(cb!=null){ v0 :n:q
list.add(cb); A9BoH[is7
} qfJ2iE|o2.
} `Ze$Bd\
} JX5/PCO
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CountControl.java @~ke=w6&pe
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/* o ;Z"I &
* CountThread.java 1K@ieVc
* EEZ~Bs}d
* Created on 2007年1月1日, 下午4:57 lF/
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* Qv~@
* To change this template, choose Tools | Options and locate the template under -9{N7H
* the Source Creation and Management node. Right-click the template and choose /fT"WaTEK
* Open. You can then make changes to the template in the Source Editor. unn2I|XH
*/ p! :oT1U
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package com.tot.count; Wgte.K> /
import tot.db.DBUtils; :~"myn,
import java.sql.*; d"-I^|[OM
/** m"Mj3Z:
* r4iNX+h?V
* @author oZY|o0/9
*/ Ss5@ n
public class CountControl{ +0%r@hTv&>
private static long lastExecuteTime=0;//上次更新时间 56s%Qlgx
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 AA,/AKikd
/** Creates a new instance of CountThread */ nD
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public CountControl() {} +5|k#'%5
public synchronized void executeUpdate(){ PV~D;
Connection conn=null; cb)7$S
PreparedStatement ps=null; OjlX<y.
try{ E%v0@
conn = DBUtils.getConnection(); [nV BnB
conn.setAutoCommit(false); U'" #jT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [#@lsI
for(int i=0;i<CountCache.list.size();i++){ BXdk0
CountBean cb=(CountBean)CountCache.list.getFirst(); %zGv+H?
CountCache.list.removeFirst(); ~Oq
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ps.setInt(1, cb.getCountId()); y$-@|M$GG
ps.executeUpdate();⑴ ?eX$Wc{
//ps.addBatch();⑵ AeEdqX)
} \)uA:v
//int [] counts = ps.executeBatch();⑶ 2=K|kp5
conn.commit(); Qm3F=*)d
}catch(Exception e){ d]sqj\Q57
e.printStackTrace(); nm<VcCc
} finally{ AzJ;EtR
try{ gkxHfm
if(ps!=null) { *l
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ps.clearParameters(); F5x*#/af
ps.close(); (kY0<
ps=null; NYHK>u/5c
} uQ_C<ii"W
}catch(SQLException e){} g4,ldr"D
DBUtils.closeConnection(conn); 8=Oym~
} "!vY{9,
} n!Y_SPg
public long getLast(){ 80Hi v
return lastExecuteTime; 8~Zw"
} %JSRC<,a
public void run(){ (S W6?5
long now = System.currentTimeMillis(); +i!HMyM
if ((now - lastExecuteTime) > executeSep) { y(g]:#
//System.out.print("lastExecuteTime:"+lastExecuteTime); M.y!J
//System.out.print(" now:"+now+"\n"); Ddq*}Pf0K
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); J2x}@p
lastExecuteTime=now; ZHZxr
executeUpdate(); , 2#Q>
} HM)D/CO,?
else{ |z3!3?%R
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); @R`6jS_gK
} D
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} 9jf9u0
} &'k(v(>n,
//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 !\{2s!l~
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类写好了,下面是在JSP中如下调用。 Hl%Og$q3
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<% E-Xz
CountBean cb=new CountBean(); *V:U\G
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); XZ.D<T"
CountCache.add(cb); iP9]b&
out.print(CountCache.list.size()+"<br>"); "Ua-7Q&A
CountControl c=new CountControl(); iT{4-j7|P4
c.run(); Rkk`+0K7$J
out.print(CountCache.list.size()+"<br>"); j~\FDcG*ed
%>