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: V^[&4
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CountBean.java [ R+M .5
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/* A"b31*_
* CountData.java qQ3Q4R\
* z!bT^_Cc0
* Created on 2007年1月1日, 下午4:44 hwXsfh |
* dB4ifeT]
* To change this template, choose Tools | Options and locate the template under Fd<Ouyxqe
* 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
*/ |LQ%sV
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package com.tot.count; LS<+V+o2%
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/** ~=OJCKv5(
* ]9w)0iH
* @author 1%B9xLq
*/ N}B&(dJ
public class CountBean { IP#vfM
private String countType; TA*}p=?6?!
int countId; ]YhQQH1>]
/** Creates a new instance of CountData */ `&q+ f+z
public CountBean() {} {u1|`=;
public void setCountType(String countTypes){ Lr*PbjQDIY
this.countType=countTypes; 2ak]&ll+h
} k
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public void setCountId(int countIds){ 95@u|#n
this.countId=countIds; q5e(~@(z<`
} %+j/nA1%S
public String getCountType(){ N)Q_z9b=
return countType; U3:|!CC)T
} F=e;[uK\
public int getCountId(){ \^dse
return countId; iEtR<R>=
} cK]n"6N[
} xtv%C
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CountCache.java }?mSMqnB
.cs x"JC
/* @PNgqjd
* CountCache.java t`Z3*?UqI
* t.;._'
* Created on 2007年1月1日, 下午5:01 =T2SJ)
* aanS^t0
* To change this template, choose Tools | Options and locate the template under @B>D>B
* the Source Creation and Management node. Right-click the template and choose 7_s+7x =
* Open. You can then make changes to the template in the Source Editor. S5>ztK.e
*/ sd%)g<t
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package com.tot.count; J{\U w].|0
import java.util.*; q6-o!>dLQ
/** ]m 3cm
* hIqU idJod
* @author N80ogio_Tk
*/ q9ra
public class CountCache { 5"57F88Y1
public static LinkedList list=new LinkedList(); =bD.5,F)
/** Creates a new instance of CountCache */ ya~;Of5
public CountCache() {} T=-UcF
public static void add(CountBean cb){ y-.{){uaD
if(cb!=null){ M}11 tUl
list.add(cb); |A*4Fuc&
} 7=?!B#hm!
} w" [T
} A r>JQ@0
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CountControl.java )m
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/* y]@JkF(
* CountThread.java I(R%j]LX&
* sNpA!!\PM
* Created on 2007年1月1日, 下午4:57 6}R*7iMs
* Qm3F=*)d
* To change this template, choose Tools | Options and locate the template under B6IKD
* the Source Creation and Management node. Right-click the template and choose nm<VcCc
* Open. You can then make changes to the template in the Source Editor. -(
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*/ gkxHfm
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package com.tot.count; F5x*#/af
import tot.db.DBUtils; C=&n1/
import java.sql.*; NYHK>u/5c
/** PA
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* zL+t&P[\
* @author Ip7#${f5M
*/ $-UVN0=
public class CountControl{ m0^ "fMV
private static long lastExecuteTime=0;//上次更新时间 %(&ja_oO
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8~Zw"
/** Creates a new instance of CountThread */ J'ce?_\?PY
public CountControl() {} (S W6?5
public synchronized void executeUpdate(){ +i!HMyM
Connection conn=null; y(g]:#
PreparedStatement ps=null; M.y!J
try{ Ddq*}Pf0K
conn = DBUtils.getConnection(); J2x}@p
conn.setAutoCommit(false); 9b=0
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); , 2#Q>
for(int i=0;i<CountCache.list.size();i++){ dO z|CfUhI
CountBean cb=(CountBean)CountCache.list.getFirst(); E]n]_{BN]
CountCache.list.removeFirst(); ,|yscp8
ps.setInt(1, cb.getCountId()); ;Z0&sFm
ps.executeUpdate();⑴ O0'|\:my
//ps.addBatch();⑵ XTX/vbge3m
} y{3+Un
//int [] counts = ps.executeBatch();⑶ 5%9Uh'y#
conn.commit(); Go c*ugR
}catch(Exception e){ uZL,%pF3A
e.printStackTrace();
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} finally{ U'F}k0h?\'
try{ dO2?&f
if(ps!=null) { <S7SH-{_\
ps.clearParameters(); o>(<:^x9
ps.close(); .^=I&X/P
ps=null; u(1m#xr8$
} dDl+
}catch(SQLException e){} 0|-}>>qb\
DBUtils.closeConnection(conn); @a]cI
} 3t+{~{Dj
} M/.M~/~
public long getLast(){ BQWgL
return lastExecuteTime; KxKZC}4m
} c3l(,5DtH
public void run(){ T5}3Y3G,6
long now = System.currentTimeMillis(); xV+\R/)x
if ((now - lastExecuteTime) > executeSep) { M x,5
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,8Q0AkG
//System.out.print(" now:"+now+"\n"); '+$r7?dKP
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9c}C<s`M
lastExecuteTime=now; E<-W & a }
executeUpdate(); %Bm{ctf#)
} k]:`<`/I_
else{ ".|8 (Y
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); a"xRc
} 3,G|oR{D
} T7mT:z>:
} m[y~-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 .{ILeG
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类写好了,下面是在JSP中如下调用。 1WqCezI
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<% bQI :N
CountBean cb=new CountBean(); ]7k:3"wH
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 8wd["hga<%
CountCache.add(cb); 9+m>|"F0
out.print(CountCache.list.size()+"<br>"); 1&e8vVN
CountControl c=new CountControl(); ]!S#[Wt {k
c.run(); }03?eWk/y
out.print(CountCache.list.size()+"<br>"); H(n
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%>