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: BC%V<6JBu(
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CountBean.java #%CB`l
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/* Zh:@AFz:R
* CountData.java W1}d6Sbg
* =b3<}]
* Created on 2007年1月1日, 下午4:44 -!j5j:RR
* ,PWMl[X
* To change this template, choose Tools | Options and locate the template under > W^"*B
* the Source Creation and Management node. Right-click the template and choose )P W Zc?M
* Open. You can then make changes to the template in the Source Editor. |'k7 ;UW
*/ jjoyMg95
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package com.tot.count; x50ZwV&j
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/** I&&[ ':
* |3EKK:RE
* @author uw&p)
*/ gr>>]C$
public class CountBean { Coe%R(x5
private String countType; )k 6z
int countId; r [n vgzv@
/** Creates a new instance of CountData */ O3L:v{Kn
public CountBean() {} ];{CNDAL2
public void setCountType(String countTypes){ K{G\=yJ((
this.countType=countTypes; "V4ru&a
} I(Q3YDdb
public void setCountId(int countIds){ y $>U[^G[
this.countId=countIds; 5F5)Bh
} Dv BRK}'
public String getCountType(){ dJ,,yA*
return countType; =eeZtj.
} 4^w`]m
public int getCountId(){ QL@}hw.F
return countId; T;Ra/H
} enQev?8%
} $gcC}tX
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CountCache.java \BdQ(rm
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/* m@`
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* CountCache.java oe1$;K>.7
* \4 hB1-
* Created on 2007年1月1日, 下午5:01 =@ed{~
* LeXkl=CC
* To change this template, choose Tools | Options and locate the template under Cbr>\;sc2Z
* the Source Creation and Management node. Right-click the template and choose '_M"yg6d
* Open. You can then make changes to the template in the Source Editor. :&=`xAX-
*/ VL@eR9}9K
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package com.tot.count; 7,D6RP(b
import java.util.*; >KCnmi
/** FJ
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* pM_oIH'8:
* @author .5YW>P V
*/ {#TZFB
public class CountCache { X2C&q$8
public static LinkedList list=new LinkedList(); } |? W
/** Creates a new instance of CountCache */ K2oyHw<mk
public CountCache() {} s#C~HK
public static void add(CountBean cb){ 05[k@f$n
if(cb!=null){ ,=t}|!jx
list.add(cb); {edjvPlk
} _*dUH5
} gO]jeO
} `BKV/Xl
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CountControl.java
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/* +J(@.
* CountThread.java rTYMN
* (Q][d+} /
* Created on 2007年1月1日, 下午4:57 6nHyd<o
* -@G,Ry-\t
* To change this template, choose Tools | Options and locate the template under @6z]Xb
* the Source Creation and Management node. Right-click the template and choose 5(&'/U^
* Open. You can then make changes to the template in the Source Editor. <lHVch"(^$
*/ M@78.lPS
~BD 80s:f
package com.tot.count; ZuVucP>>_d
import tot.db.DBUtils; =MokbK2
import java.sql.*; GMYfcZ/,K
/** i.6+CA
* -|3feYb'
* @author }E](NvCq
*/ $]S*(K3U~
public class CountControl{ 85]3y%f9
private static long lastExecuteTime=0;//上次更新时间 j21nh >d
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Pa\"l'!>^
/** Creates a new instance of CountThread */ VF] ~J=>i
public CountControl() {} u(g0Ob
public synchronized void executeUpdate(){ t73" d#+
Connection conn=null; M"<B@p]rk:
PreparedStatement ps=null; u8i!Fxu
try{ QwgP+ M+
conn = DBUtils.getConnection(); "1%YtV5R{
conn.setAutoCommit(false); EnnE@BJ"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); u40<>A
for(int i=0;i<CountCache.list.size();i++){ YO`V'6\
CountBean cb=(CountBean)CountCache.list.getFirst(); ?'r=>'6D
CountCache.list.removeFirst(); |$a!Zx94^
ps.setInt(1, cb.getCountId()); HmZ*
ps.executeUpdate();⑴ d{G*1l(X
//ps.addBatch();⑵ We*&\e+"T
}
*B1%-
//int [] counts = ps.executeBatch();⑶ 0GP\*Y8
conn.commit(); "jMSF@lr
}catch(Exception e){ qA5PIEvdq
e.printStackTrace(); Ij9ezNZT=
} finally{ %[H|3
try{ a\?-uJ+
if(ps!=null) { 4-veO3&.h
ps.clearParameters(); zKX|m-i|2
ps.close(); 3"y,UtKGa
ps=null; Ht=h9}x"g
} ~_Q1+ax}
}catch(SQLException e){} 68-2EWq
DBUtils.closeConnection(conn); l#k&&rI5x.
} 4<Q^/-W
} Rx%SeM2
public long getLast(){ T?V!%AqY:
return lastExecuteTime; v[I,N$:
} $`Hb-
public void run(){ Fl0 :Z
long now = System.currentTimeMillis(); T+U,?2nF:
if ((now - lastExecuteTime) > executeSep) { >,)tRQS
//System.out.print("lastExecuteTime:"+lastExecuteTime); N=@Nn)
//System.out.print(" now:"+now+"\n"); 97SOa.@
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); q}0xQjpo
lastExecuteTime=now; Q/<