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: W,K%c=
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CountBean.java YOrrkbJ(
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/* de]z T^&C
* CountData.java ,&d@O>$E:
* {<5ybbhLV
* Created on 2007年1月1日, 下午4:44 W;1|+6x
* Q0\0f
* To change this template, choose Tools | Options and locate the template under jn:NYJv
* the Source Creation and Management node. Right-click the template and choose @G:V
* Open. You can then make changes to the template in the Source Editor. q|%(3,)ig
*/ 'oN\hy($,h
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package com.tot.count; }/,HM9Ke
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/** &*s0\
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* !bC+TYsU
* @author (oJ9k[(
*/ `juLQH
public class CountBean { ZbT/$\0(6
private String countType; KE1ao9H8wR
int countId; zh$}~RG[
/** Creates a new instance of CountData */ l?iSxqdT
public CountBean() {} \@>b;4Fb+N
public void setCountType(String countTypes){ 7 t?*
this.countType=countTypes; i_kE^SSgm
} 0I{gJSK.,
public void setCountId(int countIds){ xP=/N!,#
this.countId=countIds; lKkN_ (/j
} S2>c#BQ
public String getCountType(){ 5VO;s1
return countType; |8bq>01~
} fgj^bcp-
public int getCountId(){ '<R>E:5
return countId; {} Bf
} uHIiH@S
} KIeT!kmDl
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CountCache.java b7/AnSR~Jt
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/* +p8BGNW,
* CountCache.java P"lBB8\eku
* ;Efcw[<
* Created on 2007年1月1日, 下午5:01 F3oQ^;xB
* +f0~D(d!_
* To change this template, choose Tools | Options and locate the template under +x]9+D&
* the Source Creation and Management node. Right-click the template and choose azP+GM=i7
* Open. You can then make changes to the template in the Source Editor. >23-
*/ efG6v
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package com.tot.count; F/1#l@qN
import java.util.*; +
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/** s!+"yK
* QR">.k4QJ
* @author y{9~&r
*/ [0OJdY4
public class CountCache { 6r"u$i`o
public static LinkedList list=new LinkedList(); nJ?^?M'F%
/** Creates a new instance of CountCache */ $ \*`
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public CountCache() {} N4K8
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public static void add(CountBean cb){ ^+SkCO
if(cb!=null){ q4UA]+-*
list.add(cb); =N);v\ Q$!
} 0lM{l?
} jxgj,h"}9`
} 8wH.et25k
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CountControl.java ?8,%LIQ?
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/* <P%}|@
* CountThread.java a4gi,pz$]
* pbHsR^
* Created on 2007年1月1日, 下午4:57 rs=q!
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* QHBtWQgS
* To change this template, choose Tools | Options and locate the template under GO! uwo:
* the Source Creation and Management node. Right-click the template and choose fWGOP~0
* Open. You can then make changes to the template in the Source Editor. 3E^M?N2oc
*/ o$.e^XL
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package com.tot.count; nsb4S{
import tot.db.DBUtils; I1 U7.CT
import java.sql.*; @OV-KT[>
/** k;dXOn
* jy2IZ o
* @author .7ayQp
*/ Fk=}iB#(
public class CountControl{ Hqz?E@bc@
private static long lastExecuteTime=0;//上次更新时间 O)R(==P26P
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 rC[6lIP
/** Creates a new instance of CountThread */ B6}FIg)
public CountControl() {} d h^^G^
public synchronized void executeUpdate(){ $!A:5jech
Connection conn=null; aH_6s4+:
PreparedStatement ps=null; hbOnlj4
try{ rAdacnZV
conn = DBUtils.getConnection(); I-NN29Sk
conn.setAutoCommit(false); _ia! mT<
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n
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for(int i=0;i<CountCache.list.size();i++){ !.5),2
CountBean cb=(CountBean)CountCache.list.getFirst(); !SHj$Jwa'
CountCache.list.removeFirst(); }iBC@`mg(
ps.setInt(1, cb.getCountId()); _L.n,
ps.executeUpdate();⑴ 02JL*
//ps.addBatch();⑵ vOI[Z0Lq9h
} -m 5}#P89
//int [] counts = ps.executeBatch();⑶ RAs0]K
conn.commit(); io4A>>W==/
}catch(Exception e){ ALd;$fd qf
e.printStackTrace(); Fs/?
} finally{ oh#N
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try{ &ogt2<1W
if(ps!=null) { fvo<(c#Y#
ps.clearParameters(); gd@p|PsS^
ps.close(); |`yZIY_
ps=null; |f2A89
} $<)Yyi>6E
}catch(SQLException e){} \[wCp*;1}
DBUtils.closeConnection(conn); Y^ve:Z
} cm>E[SHr
} K=u0nrG*
public long getLast(){ m)?5}ZwAH
return lastExecuteTime; 1@sM1WMX
} J_#R 87
public void run(){ #$'"cfRxc
long now = System.currentTimeMillis(); j;P+_Hfe/E
if ((now - lastExecuteTime) > executeSep) { s0LA^2U
//System.out.print("lastExecuteTime:"+lastExecuteTime); \X}8q
//System.out.print(" now:"+now+"\n"); S9Y[4*//
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); K3$`
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lastExecuteTime=now; _EYB
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executeUpdate(); rE!1wc>L
} &bC}3D
else{ sJr5t?
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 73NZ:h%=
} FY;+PY@I{
} EH9Hpo
} ,qFA\cO*
//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 ~0tdfK0c
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类写好了,下面是在JSP中如下调用。 1-;?0en&0
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<% uVU`tDzd:
CountBean cb=new CountBean(); udqge?Tz
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Aa(<L$e!`
CountCache.add(cb); m24v@?*
out.print(CountCache.list.size()+"<br>"); +GNWF%
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CountControl c=new CountControl(); (7q^FtjA#
c.run(); jD<pIHau
out.print(CountCache.list.size()+"<br>"); wgd<3 X
%>