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: ,0 &lag
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CountBean.java R/^JyL
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/* X_'.@q<!CV
* CountData.java M:`hb$k:
* aG}9Z8D
* Created on 2007年1月1日, 下午4:44 Pz|qy,
* }h_Op7.5D
* To change this template, choose Tools | Options and locate the template under @?B=8VHR
* the Source Creation and Management node. Right-click the template and choose EkSTN
* Open. You can then make changes to the template in the Source Editor. mZ;yk(
*/ cfeX(0
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package com.tot.count; FYcMvY
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/** 7Xad2wXn
* iY|YEi8
* @author
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*/ -Ez|
public class CountBean { f6L_uk`{
private String countType; zW0AB8l
int countId; &vMH
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/** Creates a new instance of CountData */ :LBe{Jbw
public CountBean() {} q<yH!
public void setCountType(String countTypes){ (C-z8R
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this.countType=countTypes; WQ5sC[&
} ^Nsl5
public void setCountId(int countIds){ @5?T]V g
this.countId=countIds; Q5,@P?
} z)VIbEy
public String getCountType(){ "]_|c\98
return countType; -/gS s<"
} ^CK)q2K>[
public int getCountId(){ @eTsS%f2
return countId; Ar<OP'C
} /a$+EQ$
} D`t e|K5
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CountCache.java Yip9K[
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/* 4|$D.`Wu
* CountCache.java D} .t
* 3-mw-;.
* Created on 2007年1月1日, 下午5:01 +1)C&:
* 9>i6oF]Oq
* To change this template, choose Tools | Options and locate the template under L\Jl'r|
* the Source Creation and Management node. Right-click the template and choose Pm1
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* Open. You can then make changes to the template in the Source Editor. @Qs-A^.
*/ 1=;QWb6
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package com.tot.count; D+SpSO7yg
import java.util.*; Nr[Rp
/** \OU+Kl<
* YjX=@
* @author 42wcpSp
*/ Mb>6.l
public class CountCache { CD&m4^X5D
public static LinkedList list=new LinkedList(); AltE~D/4
/** Creates a new instance of CountCache */ +uLo~GdbE
public CountCache() {} 87^
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public static void add(CountBean cb){ Agi1r]W
if(cb!=null){ *cf"l
list.add(cb); 8zc!g|5"
} +
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} P+b^;+\1s
} Oq2H>eW`f
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CountControl.java z;/'OJ[.
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/* J7\q#] ?
* CountThread.java mN eW|3a
* x>J3tp$2
* Created on 2007年1月1日, 下午4:57 WvJ?e
* Pu^~]^W)
* To change this template, choose Tools | Options and locate the template under DrEtnt
* the Source Creation and Management node. Right-click the template and choose r{Q< a
* Open. You can then make changes to the template in the Source Editor. V^{!d}
*/ xI<dBg|]+
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package com.tot.count; ;:|KfXiC8
import tot.db.DBUtils; h]Oplp4\W
import java.sql.*; Q'a N|^w"f
/** 1ZL_;k
* fv_wK_.
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* @author 7[H`;l
*/ YxtkI:C?
public class CountControl{ {^f0RGJg9
private static long lastExecuteTime=0;//上次更新时间 Q*C4
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 zrew:5*uZ
/** Creates a new instance of CountThread */ .cF$f4>2
public CountControl() {} 2`I;f/Sd
public synchronized void executeUpdate(){ 1!`768
Connection conn=null; /a(zLHyz)
PreparedStatement ps=null; e\_6/j7'
try{ '&QT}B
conn = DBUtils.getConnection(); X}-H=1T?
conn.setAutoCommit(false); f`,Hr?H
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); .O#lab`:2
for(int i=0;i<CountCache.list.size();i++){ YgiGI
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CountBean cb=(CountBean)CountCache.list.getFirst(); 2A%T!9J3
CountCache.list.removeFirst(); 9-Qtj49
ps.setInt(1, cb.getCountId()); x!~OK::o8
ps.executeUpdate();⑴ %~5Q^3$O
//ps.addBatch();⑵ L%d?eHF
} 12PE{Mut
//int [] counts = ps.executeBatch();⑶ lDU:EJ&DHE
conn.commit(); !5OMAWNU@
}catch(Exception e){ BNCJT$tYX
e.printStackTrace(); sOxdq"E
} finally{ t60/f&A#7H
try{ +7/*y}.U
if(ps!=null) { `Y\/US70{c
ps.clearParameters(); 9`v:$(I
ps.close(); 9(F?|bfk
ps=null; LQ@|M.$A
} 0:Y`#0qK
}catch(SQLException e){} <u?hdwW\
DBUtils.closeConnection(conn); i 9tJHeSm
} wDhcHB
} 'h^DI`
public long getLast(){ $JB:rozE
return lastExecuteTime; gyQ9Z}
} <M OL{jan
public void run(){ IVzA>Vd
long now = System.currentTimeMillis(); j& o+KV
if ((now - lastExecuteTime) > executeSep) { tN3 {7'\7
//System.out.print("lastExecuteTime:"+lastExecuteTime); wmr%h q
//System.out.print(" now:"+now+"\n"); b2=Q~=Wc
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); -fx88
lastExecuteTime=now; O|&TL9:
executeUpdate(); D
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} aaugu.9
else{ ]A]E)*
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); W:poUG1UR
} /e sk
} m=.7f9
} OEE{JVeI
//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 =P;;&j3Z
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类写好了,下面是在JSP中如下调用。 Kc[u}
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<% @
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CountBean cb=new CountBean(); e~s7ggg2k
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); '+I
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CountCache.add(cb); K}=8:BaUL
out.print(CountCache.list.size()+"<br>"); UVCMB_T
CountControl c=new CountControl();
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c.run(); X_({};mz
out.print(CountCache.list.size()+"<br>"); <SM&VOiaOz
%>