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: NiW9/(;xB
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CountBean.java 4aBVO%t
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/* !8[A;+o3P
* CountData.java q@[F|EF=
* *9kg\#
* Created on 2007年1月1日, 下午4:44 Z Se30Rl\
* X 5
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* To change this template, choose Tools | Options and locate the template under h`N2M,
* the Source Creation and Management node. Right-click the template and choose xi "3NF%=
* Open. You can then make changes to the template in the Source Editor. z|%Pi J,
*/ X5[t6q!
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package com.tot.count; 3Q=\W<Wu
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/** 0,DrVGa
* .qZz'Eq[
* @author {fHor
*/ !s1<)%Jt
public class CountBean { Qr~!YPK\
private String countType; qwj7CIc(
int countId; jF}kV%E
/** Creates a new instance of CountData */ g%S/)R,,ct
public CountBean() {} 7:uz{xPK6
public void setCountType(String countTypes){ a4~B
this.countType=countTypes; 1Xm>nF~
} K)J_q3qo
public void setCountId(int countIds){ ( s4W&
this.countId=countIds; (E00T`@t0i
} Ru*gbv,U
public String getCountType(){ Pm)*zdZ8
return countType; $G"\@YC<
} "ckK{kS4~
public int getCountId(){ W#P\hx
return countId; [ R+M .5
} {zm8`
} A"b31*_
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CountCache.java q/I( e
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/* dB4ifeT]
* CountCache.java -A
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* 7JQ4*RM
* Created on 2007年1月1日, 下午5:01 B?8*-0a'[
* 8Z\q)T
* To change this template, choose Tools | Options and locate the template under ]j/=
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* the Source Creation and Management node. Right-click the template and choose *,lDo9
* Open. You can then make changes to the template in the Source Editor. :g63*d+/G
*/ 67Pmnad
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package com.tot.count; /K&9c
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import java.util.*; QH(&Cu,
/** k $gcQ:|
* b=MW;]F
* @author EDgtn)1
*/ {*O+vtir%
public class CountCache { Bv@p9 ]
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public static LinkedList list=new LinkedList(); <H60rON
/** Creates a new instance of CountCache */ +CBN[/Z^i
public CountCache() {} d>)=|
public static void add(CountBean cb){ ZXYyG`3+
if(cb!=null){ T=42]h
list.add(cb); SQf[1}$ .
}
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} i:jXh9+
} Oz-/0;1n
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CountControl.java iEtR<R>=
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/* v\?J=|S+
* CountThread.java ~v2(sRJ
* Ep./->fOA
* Created on 2007年1月1日, 下午4:57 #?S"y:
* .cs x"JC
* To change this template, choose Tools | Options and locate the template under @PNgqjd
* the Source Creation and Management node. Right-click the template and choose t`Z3*?UqI
* Open. You can then make changes to the template in the Source Editor. xJ/)*?@+
*/ =T2SJ)
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package com.tot.count; oz=ULPZ%
import tot.db.DBUtils; O8\f]!O(
import java.sql.*; :~"myn,
/** 8TB|Y
* m"Mj3Z:
* @author r4iNX+h?V
*/ V||b%Cb1g
public class CountControl{ Ss5@ n
private static long lastExecuteTime=0;//上次更新时间 =
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 \ [[xyd
/** Creates a new instance of CountThread */ 0g:q%P0
public CountControl() {} }1 qQ7}v
public synchronized void executeUpdate(){ jnJ*e-AW
Connection conn=null; (N&?Z]|yr
PreparedStatement ps=null; iKPgiL~
try{ m\jjj^f a
conn = DBUtils.getConnection(); @uRJl$3
conn.setAutoCommit(false); d5Ae67
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Gy):hGgN
for(int i=0;i<CountCache.list.size();i++){ @,sjM]
CountBean cb=(CountBean)CountCache.list.getFirst(); aB;f*x
CountCache.list.removeFirst(); s1cu5eCt
ps.setInt(1, cb.getCountId()); LhAW|];
ps.executeUpdate();⑴ 3h.,7,T
//ps.addBatch();⑵ eJ45:]_%I@
} N(4y}-w$
//int [] counts = ps.executeBatch();⑶ }gXhN"
conn.commit(); L{jx'[C
}catch(Exception e){ wMCg`rk
e.printStackTrace(); BSHS)_xs
} finally{ #p*uk
try{ L)U*dY
if(ps!=null) { ER9{D$
ps.clearParameters(); BrSvkce
ps.close(); C=&n1/
ps=null; $<)]~**K
} PA
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}catch(SQLException e){} g4,ldr"D
DBUtils.closeConnection(conn); 8=Oym~
} n^{h@u
} n5"oXpcIx
public long getLast(){ J7",fb
return lastExecuteTime; Yu" Q
} oCkG
public void run(){ ].J;8}
long now = System.currentTimeMillis(); Am@Ta "2
if ((now - lastExecuteTime) > executeSep) { ZlC+DXg#S
//System.out.print("lastExecuteTime:"+lastExecuteTime); tc`3-goX
//System.out.print(" now:"+now+"\n"); "TaLvworb4
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); *8,W$pe3
lastExecuteTime=now; B`R@%US
executeUpdate(); 9kWI2cLzQt
} )N- '~<N
else{ 64U|]gd$
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !?ZR_=Y%
} ?+d{Rh)y
} |LC"1 k
} 8k:^( kByF
//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 !$1qnsz
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类写好了,下面是在JSP中如下调用。 baG_7>Q9H
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<% dO2?&f
CountBean cb=new CountBean(); <S7SH-{_\
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); I^f|U
CountCache.add(cb); {"~[F 2qR
out.print(CountCache.list.size()+"<br>"); Xux[
CountControl c=new CountControl(); E-Xz
c.run(); 9[VYd '
out.print(CountCache.list.size()+"<br>"); ;0m J4G
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