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: Wex4>J<`/
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CountBean.java dJ;;l7":~
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/* $N
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* CountData.java s`>[F@N7.o
* "kZ[N'z(
* Created on 2007年1月1日, 下午4:44 u+{a8=
* i1RiGS
* To change this template, choose Tools | Options and locate the template under 3P;>XGCxZ
* the Source Creation and Management node. Right-click the template and choose dK>7fy;mv
* Open. You can then make changes to the template in the Source Editor. trE{ FT
*/ ZcYh) HD
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package com.tot.count; aM4k *|H?
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/** 7=(Hy\Q5xH
* U4G`ZKv(!
* @author 41SGWAd#:
*/ ? R>h `
public class CountBean { fU!<HDh
private String countType; `Qeg
int countId; VE8;sGaJ
/** Creates a new instance of CountData */ 0@AAulRl
public CountBean() {} `=7j$#6U
public void setCountType(String countTypes){ ;j2vHU#q-
this.countType=countTypes; NzNA>[$[
} aN(|'uO@
public void setCountId(int countIds){ qoAj]
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this.countId=countIds; c_elShK8#
} MTUn3;c/
public String getCountType(){ 6d+p7x
return countType; Afk$?wkL
} B-l'vVx
public int getCountId(){ Uk\Id~xLV
return countId; H<1WbM:w
} S6[v;{xJ
} >|;aIa@9
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CountCache.java |<O9Sb_
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/* Q?X>E3=U
* CountCache.java @$T 9Ll
* uw2hMt (N
* Created on 2007年1月1日, 下午5:01 D.mHIsX6\
* /JT#^Y
* To change this template, choose Tools | Options and locate the template under a. z;t8
* the Source Creation and Management node. Right-click the template and choose /q5:p`4{J
* Open. You can then make changes to the template in the Source Editor. IUwm}9Q!
*/ ]Zmj4vK J
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package com.tot.count; gynh#&r
import java.util.*; uIZWO.OdU
/** !A%<#Gjt
* rylzcN9RM$
* @author M}!2H*
*/ PiA0]>
public class CountCache { Q~T$N
public static LinkedList list=new LinkedList(); {P*m;a`}
/** Creates a new instance of CountCache */ |7zd%!
public CountCache() {} nMJ#<'v^!2
public static void add(CountBean cb){ P+$:(I
if(cb!=null){ o*J3C>
list.add(cb); )wNP(
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} A,4fEmWM
} ){UcS/GI=
} &-;5*
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CountControl.java :>=\. \
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/* v;)..X30
* CountThread.java @9"J|}
* y:6; LZ9[
* Created on 2007年1月1日, 下午4:57 _8E/)M
* &%-73nYw
* To change this template, choose Tools | Options and locate the template under N ,z6y5Lu
* the Source Creation and Management node. Right-click the template and choose Dtj&W<NXo
* Open. You can then make changes to the template in the Source Editor. Jkek-m
*/ gg8Uo G
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package com.tot.count; F>rH^F
import tot.db.DBUtils; e2A-;4?_
import java.sql.*; ,2W8=ON
/** 53[~bwD
* cCxBzkH6
* @author p3^m9J
*/ ynrT a..
public class CountControl{ ^U!0-y
private static long lastExecuteTime=0;//上次更新时间 4F{70"a
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 GP#aya
/** Creates a new instance of CountThread */ 8e(\%bX
public CountControl() {} L+q/){Dd(
public synchronized void executeUpdate(){ >:b Q
Connection conn=null; @/31IOIV]`
PreparedStatement ps=null; OE- gC2&Bm
try{ ~Rr~1I&mR,
conn = DBUtils.getConnection(); 3p'I5,}
conn.setAutoCommit(false); yYfsy?3
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); hyFyP\u]
for(int i=0;i<CountCache.list.size();i++){ z5YWt*nm
CountBean cb=(CountBean)CountCache.list.getFirst(); -jiG7OL
CountCache.list.removeFirst(); OtNd,U.dE
ps.setInt(1, cb.getCountId()); 1 9CK+;b
ps.executeUpdate();⑴ H/37)&$E(
//ps.addBatch();⑵ J_4!2v!6e
} FIsyiSY<j
//int [] counts = ps.executeBatch();⑶ kbe-1 <72
conn.commit(); {Ja!~N;3
}catch(Exception e){ 1 |jt"Hz
e.printStackTrace(); ?pd8w#O
} finally{ ^t#&@-'(d
try{ $\U4hHOo
if(ps!=null) { c-0#w=
ps.clearParameters(); >o=-$gz`
ps.close(); #}y2)g
ps=null; J
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} Kh_Lp$'0uM
}catch(SQLException e){} 2_Z ? #Y
DBUtils.closeConnection(conn); M"94#.dKK
} v
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} U3dwI:cG
public long getLast(){ K>@+m
return lastExecuteTime; A nX%[W "
} e\:+uVzz
public void run(){ FFEfI4&SfS
long now = System.currentTimeMillis(); ?o|f':
if ((now - lastExecuteTime) > executeSep) { jJPGrkr
//System.out.print("lastExecuteTime:"+lastExecuteTime); 4.5|2\[
//System.out.print(" now:"+now+"\n"); gK'1ZLdZ2
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); OD!& .%
lastExecuteTime=now; <d$x.in
executeUpdate(); XcUwr
} VG
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else{ "[ZB+-|[0
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /x
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} }xh$T'M8
} oc >{?.^
} ,1+y/{S
//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 )`O~f_pIC
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类写好了,下面是在JSP中如下调用。 !'9Feoez
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<% <"my^
CountBean cb=new CountBean(); R[hzMU}KB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); z?*w8kU&>
CountCache.add(cb); N@Uy=?)ZJ
out.print(CountCache.list.size()+"<br>"); LAS'u"c|
CountControl c=new CountControl(); 2so!
c.run(); 8b;1FQ'
out.print(CountCache.list.size()+"<br>"); f@|A[>"V
%>