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: Rg* J}
6GYtY>
CountBean.java @u)
'yS
B8m_'!;;
/* H{V)g
* CountData.java VXm[-
* h1+hds+
* Created on 2007年1月1日, 下午4:44 7byCc_,
* 8~ #M{}
* To change this template, choose Tools | Options and locate the template under uLN[*D
* the Source Creation and Management node. Right-click the template and choose _8><| 3d
* Open. You can then make changes to the template in the Source Editor. )NT5yF,m
*/ n.hElgkUOr
59*M"1['Q
package com.tot.count; KrKu7]If6#
;;V\"7q'
/** !QEL"iJ6M'
* U,;xZe
* @author H"CUZ
*/ 6;oe=Q:Q
public class CountBean { ;GsQR+en
private String countType; /N)5
3!LT
int countId; E'c%d[:H,
/** Creates a new instance of CountData */ ;=jr0\| e
public CountBean() {} &|5GB3H=
public void setCountType(String countTypes){ },c,30V'
this.countType=countTypes; IfV
3fJ7
} Y )b@0'
public void setCountId(int countIds){ ^0tw%6:
this.countId=countIds; @Bs0Avj.
} 4h|dHXYZ
public String getCountType(){ _+w/
pS`M
return countType; %f&< wC
} .Q&rfH3
public int getCountId(){ I,O#X)O|i
return countId; /#S>sOg2xq
} 5j^NV&/_
} C3VLV&wF
:b/jNHJU
CountCache.java ~xyw>m+o.
v6uxxsI>Hm
/* z.)p
P'CJo
* CountCache.java P<;7j?
* ?KWj}|%
* Created on 2007年1月1日, 下午5:01 *'R#4@wmP
* A0xC,V~z
* To change this template, choose Tools | Options and locate the template under ~kKrDLW+
* the Source Creation and Management node. Right-click the template and choose &L4
q10-N
* Open. You can then make changes to the template in the Source Editor. J]pa4C`
*/ eThy+
I@ \#up}
package com.tot.count; "5!BU&
import java.util.*; .q;ED`G
/** Hl7:*]l7b
* 0ys~2Y!eH
* @author 1 W'F3
*/ z4M1D9iPY
public class CountCache { ftZj}|R!
public static LinkedList list=new LinkedList(); @Doyt{|T
/** Creates a new instance of CountCache */ .T.5TMiOSq
public CountCache() {} $.K?N@(W
public static void add(CountBean cb){ Cg!^S(U4
if(cb!=null){ x?r1s#88>
list.add(cb); rZwB>c
} TGV
} BC/_:n8O
} 3Wx,oq;4-
WZFH@I28
CountControl.java 1BTIJ G w
}zMf7<C
/* B|o%_:]+E
* CountThread.java Imym+
* R+=a`0_S
* Created on 2007年1月1日, 下午4:57 ?IYY'fS"
* $L}aQlA1JM
* To change this template, choose Tools | Options and locate the template under 61K"(r~
* the Source Creation and Management node. Right-click the template and choose ..KwTf
* Open. You can then make changes to the template in the Source Editor. k#)Ad*t
*/ t})$lM
7_\Mwy{P
package com.tot.count; g+[kde;(^
import tot.db.DBUtils; V@ :20m
import java.sql.*; +=3CL2{An
/** 9$l>\.6
* ``QHG&$/
* @author n2ndjE$
*/ 0SV \{]2
public class CountControl{ `
2%6V)s
private static long lastExecuteTime=0;//上次更新时间 ,x_Z JL
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 JW+*d`8Z[
/** Creates a new instance of CountThread */ (> "QVxr
public CountControl() {} ^toAw8A=@0
public synchronized void executeUpdate(){ ZX.TqvK/r
Connection conn=null; XZph%j0o
PreparedStatement ps=null; sbsu(Sz+
try{ V1bh|+o9
conn = DBUtils.getConnection(); $Ua56Y
conn.setAutoCommit(false); i|$z'HK;+
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Ax<\jW<
for(int i=0;i<CountCache.list.size();i++){ Z<z;L<tJ 9
CountBean cb=(CountBean)CountCache.list.getFirst(); VOgi7\
CountCache.list.removeFirst(); OtUrGQP
ps.setInt(1, cb.getCountId()); (Mt5 P
ps.executeUpdate();⑴ w:ULi3
//ps.addBatch();⑵ 1B:aC|B
} pP/@
//int [] counts = ps.executeBatch();⑶ TZB+lj1
conn.commit(); 1'KishHK=
}catch(Exception e){ YUkud2,j
e.printStackTrace(); @h9MxCE!
} finally{ Of7+/UV
try{ }NmNanW^
if(ps!=null) { |X (2Zv^O
ps.clearParameters(); /Jlv"R1,
ps.close(); pR$6,Vi
ps=null; 0Xl%uF+w
} }GZbo kWg.
}catch(SQLException e){} B5=($?5^6%
DBUtils.closeConnection(conn); :pC;`iQ
} 'Cg{_z.~c
} lF4u{B9DM
public long getLast(){ i g71/'D
return lastExecuteTime; X>l*v\F9
} G*n2Ii
public void run(){ j$@tK0P
long now = System.currentTimeMillis(); `rFAZcEj%
if ((now - lastExecuteTime) > executeSep) { mP}#Ccji?
//System.out.print("lastExecuteTime:"+lastExecuteTime); Np,2j KF(
//System.out.print(" now:"+now+"\n"); KS<Jv;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #$ 1$T
lastExecuteTime=now; 4E3g,%9u
executeUpdate(); ecHP
&Z$
} h'5Cp(G
else{ %FA@)?~
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); t9
F=^)s
} BGWAh2w6
} n9UKcN-
} 3'eG;<