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: ,t9EL 21
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CountBean.java &<VU}c^!
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/* *#T:
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* CountData.java S hI1f
* HAxLYun(3w
* Created on 2007年1月1日, 下午4:44 mr\,"S-`
* (p-q>@m
* To change this template, choose Tools | Options and locate the template under (,U|H`
* the Source Creation and Management node. Right-click the template and choose 0)ohab
* Open. You can then make changes to the template in the Source Editor. :y-;V
*/ oMQ4q{&|
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package com.tot.count; >1j#XA8
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/** 9zwD%3Ufn
* L|CdTRgRCB
* @author
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*/ n/_q
public class CountBean { .G{cx=;
private String countType; 3K
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int countId; ?+t;\
/** Creates a new instance of CountData */ ys9:";X;}
public CountBean() {} FS1\`#Bm)
public void setCountType(String countTypes){ |>;PV4])(
this.countType=countTypes; ,*|Q=
} 9 C[~*,qx
public void setCountId(int countIds){ Nk7y2[
this.countId=countIds; NUV">i.(
} nn7LL+h
public String getCountType(){ wpK1nA+7N
return countType; ,1sbY!&ekL
} J!uG/Us
public int getCountId(){ "ko*-FrQ
return countId; fsL9d}
} @+b$43^
} 9\Jc7[b
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CountCache.java 4z<c8
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/* <_YdN)x
* CountCache.java u7< +)6-
* KU|W85ye
* Created on 2007年1月1日, 下午5:01 gi!_Nz
* m_)-
* To change this template, choose Tools | Options and locate the template under wN[lC|1c
* the Source Creation and Management node. Right-click the template and choose QX=TuyO
* Open. You can then make changes to the template in the Source Editor. 2;v:Z^&
*/ w+)${|N?
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package com.tot.count; 5P!ZGbG
import java.util.*; /e2zH
/** \S;[7T
* $JY\q2
* @author [7I:Dm
*/ dA)T>
public class CountCache { [G}dPXD
public static LinkedList list=new LinkedList(); wn[)/*(,$(
/** Creates a new instance of CountCache */ 7Eyi~jes
public CountCache() {} KQfWpHwfj
public static void add(CountBean cb){ )>ZT{eF
if(cb!=null){ <XLae'R
list.add(cb); `etw[#~N
}
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} vb>F)X?b_
} AU9C#;JD
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CountControl.java oMbd1uus
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/* @[r[l#4yUi
* CountThread.java \!^=~` X-
* f;'*((
* Created on 2007年1月1日, 下午4:57 x=DxD&I!J
* Bp^LLH
* To change this template, choose Tools | Options and locate the template under :
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* the Source Creation and Management node. Right-click the template and choose 0D,@^vw bK
* Open. You can then make changes to the template in the Source Editor. v`|]57?A
*/ 'zUV(K?2]
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package com.tot.count; /|v4]t-
import tot.db.DBUtils; H:DR?'yW
import java.sql.*; Ow;thNN
/** S^%3Vf}
* 8eB,$;i
* @author :rb;*nY!
*/ W8& )UtWQ
public class CountControl{ 01mu6)
private static long lastExecuteTime=0;//上次更新时间 |=q~X}DA
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 M(C">L]8
/** Creates a new instance of CountThread */ c+FTt(\8.
public CountControl() {} ai<qK3!O
public synchronized void executeUpdate(){ HYdM1s6vo
Connection conn=null; $FPq8$V
PreparedStatement ps=null; { "]!zL
try{ NJBSVCb
conn = DBUtils.getConnection(); irlFB#..
conn.setAutoCommit(false); n-9xfn0U~#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &PC6C<<f
for(int i=0;i<CountCache.list.size();i++){ }d%CZnY&7
CountBean cb=(CountBean)CountCache.list.getFirst(); :?xH)J,imk
CountCache.list.removeFirst(); og";mC
ps.setInt(1, cb.getCountId()); xT>9ZZcE
ps.executeUpdate();⑴ )BJkHED{
//ps.addBatch();⑵ %"{P?V<-V
} Jr5S8c|"
//int [] counts = ps.executeBatch();⑶ 9QU\J0c/
conn.commit(); z6`0Uv~
}catch(Exception e){ &2W"4SE]6
e.printStackTrace(); V?EX`2S
} finally{ DdR0u0JH0
try{ e|k]te
if(ps!=null) { QT c{7&
ps.clearParameters(); ]wid;<
ps.close(); 7T/BzXr,B
ps=null; ?s2-iuMPd
} q(n"r0)=
}catch(SQLException e){} !=YE hQ-
DBUtils.closeConnection(conn); ?|ZbQz(bL
} utmJ>GWSI
} ]Za[]E8MD
public long getLast(){ 3jZGO9ttnS
return lastExecuteTime; WWpMuB_G
} %_|KiW
public void run(){ qt L]x - O
long now = System.currentTimeMillis(); y[b8rv
if ((now - lastExecuteTime) > executeSep) { EV( F!&
//System.out.print("lastExecuteTime:"+lastExecuteTime); n3p@duC4
//System.out.print(" now:"+now+"\n"); s~OcL 5
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ~ky;[
lastExecuteTime=now; ^iONC&r
executeUpdate(); 0`E G-Hw
} ]njNSn
else{ IR${a)
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); aL:|Dr3SX
} $I9&cNPv
} LAC&W;pJ"
} !yv>e7g^
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ;O7"!\
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类写好了,下面是在JSP中如下调用。 Z]Bv
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<% bll[E}E|3
CountBean cb=new CountBean(); *)RKU),3nL
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 6>]
CountCache.add(cb); g**!'T4&o
out.print(CountCache.list.size()+"<br>"); OJu>#
CountControl c=new CountControl(); O84:ejro
c.run(); (GF}c\=T7
out.print(CountCache.list.size()+"<br>"); aV$kxzEc
%>