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: Ev,b5KelD
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CountBean.java :F
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/* 1U8/.x|
* CountData.java 1a'0cSH
* 2I0Zr;\f
* Created on 2007年1月1日, 下午4:44 @c;:D`\p1C
* a+P^?N
* To change this template, choose Tools | Options and locate the template under M`,`2I A
* the Source Creation and Management node. Right-click the template and choose Pk)H(,
* Open. You can then make changes to the template in the Source Editor. H+ 7Fw'u
*/ @^,9O92l
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package com.tot.count; zS! +2/(
q uiX"lV(
/** @@#(<[S\B
* Wqas1yL_
* @author P@8S|#LpZ
*/ )KUEkslR:
public class CountBean { LmjGU[L,@
private String countType; $mut v=IO
int countId; V~S(cO[vj
/** Creates a new instance of CountData */ D9higsN
public CountBean() {} ejlau#8"
public void setCountType(String countTypes){ ~~{+?v6B]
this.countType=countTypes; AQgm]ex<
} t`'5|
public void setCountId(int countIds){ mZ#h p}\.
this.countId=countIds; b$=c(@]
} -02.n}u>
public String getCountType(){ ,W5!=\Gg(
return countType; z;Dc#SZnO(
} KvtJtql;
public int getCountId(){ qw}.
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return countId; !]=S A &
} =4LyE6
} [*^rH:
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CountCache.java YI+o:fGC5
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/* eOs 4c`
* CountCache.java @T&w
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* ;
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* Created on 2007年1月1日, 下午5:01
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* jl,>0MA
* To change this template, choose Tools | Options and locate the template under mLH,6rO9
* the Source Creation and Management node. Right-click the template and choose KfV&7yi
* Open. You can then make changes to the template in the Source Editor. =|_k a8{?
*/ ,*g.?q@W2
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package com.tot.count; dS;Ui]/J
import java.util.*; i} ?\K>BWq
/** lcEUK
* 7 MG<!U
* @author @%rj1Gn
*/ +=#@1k~
public class CountCache { %(izKJl q
public static LinkedList list=new LinkedList(); {lN G:o
/** Creates a new instance of CountCache */ _!^2A3c<
public CountCache() {} Y(h(Z
public static void add(CountBean cb){ RW^e#z>m"E
if(cb!=null){ |snWO0iF
list.add(cb); 5 IFc"
} y{J7^o(_~
} IZ9*
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} %Hy.
* a@78&N
CountControl.java $fQ'q3
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/* pzcof#2
* CountThread.java {/K!cPp9
* Dj x[3['
* Created on 2007年1月1日, 下午4:57 gv/yfiA?
* RKwuvVI
* To change this template, choose Tools | Options and locate the template under u~\ NL{
* the Source Creation and Management node. Right-click the template and choose DXx),?s>
* Open. You can then make changes to the template in the Source Editor. nv%0EAa#}
*/ Jek3K&
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package com.tot.count; # &Z1d(!
import tot.db.DBUtils; HC(o;,spO
import java.sql.*; ?<D1]Xv
/** ky@DH(^>
* JeU1r-i
* @author b%|6y
*/ E
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public class CountControl{ 4|xQQv
private static long lastExecuteTime=0;//上次更新时间 R6qC0@*
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 BaOPtBYA:
/** Creates a new instance of CountThread */ AqjEz+TVt
public CountControl() {} s
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public synchronized void executeUpdate(){ ANXN.V
Connection conn=null;
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PreparedStatement ps=null; vKTCS
try{ d?>pcT)G_
conn = DBUtils.getConnection(); !sav~dB)
conn.setAutoCommit(false); qaEWK0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )/uCdSDIc
for(int i=0;i<CountCache.list.size();i++){ {z7kW@c
CountBean cb=(CountBean)CountCache.list.getFirst(); a'B 5m]%
CountCache.list.removeFirst(); ./Wi(p{F
ps.setInt(1, cb.getCountId()); ?oQAxb&
ps.executeUpdate();⑴ [OQ+&\
//ps.addBatch();⑵ 7hfa?Mcz
} R1C2d +L
//int [] counts = ps.executeBatch();⑶ Zksow} %
conn.commit(); I8LoXY
}catch(Exception e){ A:,R.P>`C
e.printStackTrace(); m9Hdg^L
} finally{ 77~l~EX
try{ ?CZ*MMV
if(ps!=null) { KhPDkD-
ps.clearParameters(); KAm$^N5
ps.close(); ]hlYmT
ps=null; }R)A%FKi@
} 0j2M< W#
}catch(SQLException e){} lv\^@9r
DBUtils.closeConnection(conn); ]M/*Beh
} 6|ENDd[
} l&6+ykQ
public long getLast(){ =pn(56
return lastExecuteTime; }d 16xp
} 0A.9<&Lod
public void run(){ W0KSLxM
long now = System.currentTimeMillis(); E?F?)!%
if ((now - lastExecuteTime) > executeSep) { ?Fj>7
//System.out.print("lastExecuteTime:"+lastExecuteTime); uqK[p^{
//System.out.print(" now:"+now+"\n"); 5vj tF4}7!
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 19;F+%no#
lastExecuteTime=now; t$5)6zG
executeUpdate();
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} F+::UWKA
else{ E/uKzzD9
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F=8gtk|U
} +@#k<.yqn
}
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} H&=3rkX
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 Dv-ubki
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类写好了,下面是在JSP中如下调用。 4dUr8]BkG
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<% E>w|i
CountBean cb=new CountBean(); eVujur$P
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); r`!S*zK
CountCache.add(cb); cS#m\O
out.print(CountCache.list.size()+"<br>"); AX2On}&bf
CountControl c=new CountControl(); `~ {0
c.run(); =@ "'aCU/
out.print(CountCache.list.size()+"<br>"); @-5V~itW
%>