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: }W@refS
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CountBean.java r95,X!
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/* tmOy"mq67
* CountData.java !KJA)znx;(
* Y(t/=3c[
* Created on 2007年1月1日, 下午4:44 }]H7uC!t
* TE;f*!
* To change this template, choose Tools | Options and locate the template under KTt+}-vP^
* the Source Creation and Management node. Right-click the template and choose L@z[b^
* Open. You can then make changes to the template in the Source Editor. IqV" 4
*/ Ux1j +}y
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package com.tot.count; qSlo)aP
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/** `y61Bz
* L){V(*K '
* @author c]Gs{V]\
*/
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public class CountBean { m_Pk$Vwx
private String countType; VQ,5&-9Y3
int countId; 1TX3/]:
/** Creates a new instance of CountData */ tH&eKM4G
public CountBean() {} [<5/s$,i
public void setCountType(String countTypes){ yZ 7)|j
this.countType=countTypes; Vpp$yM&?
} dH.Fb/7f
public void setCountId(int countIds){ [Rub
this.countId=countIds; 4i.&geXA.
} @54$IhhT~
public String getCountType(){ x&^Xgi?
return countType; za}Kd^KeB
} V)Oot|
public int getCountId(){ V dvj*I
return countId; ]Tb?z&
} xI<B)6D;f
} &OZx!G^Z
:-#7j}
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CountCache.java T59FRX
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/* ]KEE+o
* CountCache.java Ky7.&6\n
* Q|P
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* Created on 2007年1月1日, 下午5:01 4W|cIcU
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* @{#'y4\>
* To change this template, choose Tools | Options and locate the template under P=1Ku|k
* the Source Creation and Management node. Right-click the template and choose WY QVe_<z:
* Open. You can then make changes to the template in the Source Editor. QnOs8%HS-
*/ ZQym8iV/
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package com.tot.count; |=v,^uo
import java.util.*; %]Nm'"Y`U
/** -fV\JJ
* %z.V$2
* @author P`O`MwEAf
*/ 8 e_]
public class CountCache { w)* H&8h@
public static LinkedList list=new LinkedList(); 0FE_><e
/** Creates a new instance of CountCache */ 7[='m{{=C
public CountCache() {} }5 n\us
public static void add(CountBean cb){ ^V1\boo=
if(cb!=null){ g]JRAM
list.add(cb); GFE3p
} GOGS"q
} X^dasU{*
} *~4<CP+"0
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CountControl.java l%('5oz@\
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/* {`k&Q +gY
* CountThread.java d&L
* r_ +!3
* Created on 2007年1月1日, 下午4:57 AX&Emz-
* GIkeZV{4}
* To change this template, choose Tools | Options and locate the template under Ct?xTFb
* the Source Creation and Management node. Right-click the template and choose uPbdzUk$
* Open. You can then make changes to the template in the Source Editor. ?./fVoA]V
*/ +w(6#R8u5
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package com.tot.count; -hfkF+=U'
import tot.db.DBUtils; suIYfjh
import java.sql.*; o<p4r}*AVJ
/** %-fS:~$
* p
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* @author p<h(
*/ bC"h7$3
public class CountControl{ Ac{Tq iIv
private static long lastExecuteTime=0;//上次更新时间 ^b~ZOg[p
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )(yaX
/** Creates a new instance of CountThread */ K:qc
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public CountControl() {} ^8bc<c:P
public synchronized void executeUpdate(){ 4`9ROC
Connection conn=null; 55TFBDc
PreparedStatement ps=null; 6<
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try{ 6C<GYzzo
conn = DBUtils.getConnection(); yxT}hMa
conn.setAutoCommit(false); XYD-5pG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [>_zV.X
for(int i=0;i<CountCache.list.size();i++){ ZybfqBTD&c
CountBean cb=(CountBean)CountCache.list.getFirst(); 6{udNv X
CountCache.list.removeFirst(); vfj{j=
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ps.setInt(1, cb.getCountId()); hT_Q_1,
ps.executeUpdate();⑴ 7!(/7U6rP
//ps.addBatch();⑵ ;XyryCo
} q^6#.}
//int [] counts = ps.executeBatch();⑶ W`oyDg,D
conn.commit(); 4JXvP1`
}catch(Exception e){ K0o${%'@7
e.printStackTrace(); 7BqP3T=&_
} finally{ .X(qs 1
try{ z19%!k
if(ps!=null) { :5&UWL|
ps.clearParameters(); 0|K<$e6IH
ps.close(); 90Sras>F
ps=null; 3}3b@: <
} 4bdCbI
}catch(SQLException e){} ps8tr:T^=
DBUtils.closeConnection(conn); 65U\;Ew
} ^.g-}r8,
} #u+qV!4
public long getLast(){ x./"SQ=R+
return lastExecuteTime; xQzW6H|
} @}waZ?'
public void run(){ Hi$N"16A5z
long now = System.currentTimeMillis(); wL]#]DiE
if ((now - lastExecuteTime) > executeSep) { 6@47%%,}
//System.out.print("lastExecuteTime:"+lastExecuteTime); (d,OLng
//System.out.print(" now:"+now+"\n"); "Y5 :{Kj
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Jy"\_Vvl
lastExecuteTime=now; _*{Lha
executeUpdate(); U7g,@/Qx
} L:?Ew9Lf
else{ eTw9c }[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); BG.8 q4[
} CK|AXz+EN
} ypemp=+(r
} y] O&w{m$
//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 U H+#Nel+!
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类写好了,下面是在JSP中如下调用。 o
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<% \UM&|yk:
CountBean cb=new CountBean(); |)0Ta9~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 9B83HV4J
CountCache.add(cb); "H@I~X=
out.print(CountCache.list.size()+"<br>"); tu{paQ
CountControl c=new CountControl(); M0)0~#?.D
c.run(); p0l.f`B
out.print(CountCache.list.size()+"<br>"); s`[V{1m,
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