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: nE.w
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CountBean.java b(^/WCykH
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/* <12 ia"}
* CountData.java qTc-Z5
* Ws;S=|9,7~
* Created on 2007年1月1日, 下午4:44 @yc/1u$r
* XC44]o4jx
* To change this template, choose Tools | Options and locate the template under =' %r"_`}
* the Source Creation and Management node. Right-click the template and choose sBUK v(U)
* Open. You can then make changes to the template in the Source Editor. ogD 8qrZ6J
*/ \S#Mc
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package com.tot.count; J,N='~kfh
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/** NTq#'O) f
* K4w %XVaH
* @author =VA5!-6<Uq
*/ W5 l)mAv
public class CountBean { NsbC0xLd
private String countType; J)R2O{ z
int countId; nsf.wHGZ"J
/** Creates a new instance of CountData */ Nf@-i`
public CountBean() {} KWuc*!
public void setCountType(String countTypes){ \iN3/J4
this.countType=countTypes; `)i'1E[9
} +
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public void setCountId(int countIds){ S
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this.countId=countIds; tj ONN(K`
} @:2<cn`
public String getCountType(){ ~HW8mly'
return countType; C1V:_-
} M:[rH
public int getCountId(){ Cd Bsd
return countId; W^(:\IvV
} gteG*p i
} BH`%3Mw
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CountCache.java YJ6y]r
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/* z2.9l?"rfQ
* CountCache.java
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* G`;YB
* Created on 2007年1月1日, 下午5:01 Ca2He}r`
* ]TE(:]o7V
* To change this template, choose Tools | Options and locate the template under hq[:U?!Tt
* the Source Creation and Management node. Right-click the template and choose AiF'*!1
* Open. You can then make changes to the template in the Source Editor. aLo^f=S
*/ DfPC@`
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package com.tot.count; ~8oti4
import java.util.*; ~]w|ULNa3|
/** K3Sa6"U
* i(Xz3L#(
* @author uT
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*/ ;#i$5L!*B
public class CountCache { %pJRu-D
public static LinkedList list=new LinkedList(); v47S9Vm+
/** Creates a new instance of CountCache */ UnE[FYx
public CountCache() {} `d,v
public static void add(CountBean cb){ qj.>4d
if(cb!=null){ L2ybL#dz
list.add(cb); Y5/SbQYf1
} D4G*Wz8
} )'1rZb5
} On`T
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CountControl.java Nn/f*GDvK
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/* !T|q/ri
* CountThread.java QjIn0MJ)Xm
* sw\O\%^
* Created on 2007年1月1日, 下午4:57 id?B<OM
* ahUc;S:v#
* To change this template, choose Tools | Options and locate the template under Iq?#kV9)
* the Source Creation and Management node. Right-click the template and choose nOQvBc
* Open. You can then make changes to the template in the Source Editor. Cu $mb}@
*/ [6u8EP0xM
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package com.tot.count; v<AFcY
import tot.db.DBUtils; b%TLvV 9F
import java.sql.*; _!ITCkBj
/** xX:N-
* ?= RC?K
* @author AzZb0wW6p
*/ v1`*}.#
public class CountControl{ L60Sc
private static long lastExecuteTime=0;//上次更新时间 -tH ^Deo
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]n
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/** Creates a new instance of CountThread */ }~O`(mnD}K
public CountControl() {} U3tA"X.K
public synchronized void executeUpdate(){ R^f-j-$o]
Connection conn=null; 84f~.45
PreparedStatement ps=null; y?-zQs0
try{ (X?et
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conn = DBUtils.getConnection(); Oh'C[
conn.setAutoCommit(false); mzbMX
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); U?e.)G
for(int i=0;i<CountCache.list.size();i++){ zf.&E3Sn
CountBean cb=(CountBean)CountCache.list.getFirst(); @x[Arx^?}
CountCache.list.removeFirst(); [9H986=
ps.setInt(1, cb.getCountId()); -RBH5+SS2
ps.executeUpdate();⑴ o/\f+iz7
//ps.addBatch();⑵ %SC%#_7
} %4I13|<A`
//int [] counts = ps.executeBatch();⑶ gCP f1z
conn.commit(); yk0#byW`
}catch(Exception e){ +'ADN!(B_
e.printStackTrace(); ,xOOR
} finally{ =;m;r!,K
try{ Z~Vups#+f
if(ps!=null) { Hq!|(
ps.clearParameters(); @A1Ohl
ps.close(); d3&l!DoX
ps=null; AD@-H0Y
} =g^k$ Rc
}catch(SQLException e){} }pOJ M&I
DBUtils.closeConnection(conn); >`)IdX
} S&z8-D=8k
} +<$b6^>!$
public long getLast(){ Jj'dg6QY'
return lastExecuteTime; 586lN22xM
} D"ecwx{%;C
public void run(){ K0-AP
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long now = System.currentTimeMillis(); <F&53N&Zc
if ((now - lastExecuteTime) > executeSep) { x~n]r[!L
//System.out.print("lastExecuteTime:"+lastExecuteTime); /=+Bc=<lZ
//System.out.print(" now:"+now+"\n"); "3e1 7dsY
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); R$M>[Kjn
lastExecuteTime=now; ~Blsj9a2
executeUpdate(); " ,>,t_J
} <:!;79T\
else{ 7&Qf))L
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); b6ui&Y8z
} !J k|ha~r
}
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} vI5'npM
//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 WX}pBmU
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类写好了,下面是在JSP中如下调用。 mY0FewwTy
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