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: yZY \MB/
bL`TySX
CountBean.java )MVz$h{c.]
Pm6pv;WK
/* K-)]
1BG
* CountData.java (XTG8W sN
* k=$TGqQY?
* Created on 2007年1月1日, 下午4:44 ; nfdGB
* bW427B0
* To change this template, choose Tools | Options and locate the template under Wu/]MBM
* the Source Creation and Management node. Right-click the template and choose BKCiIfkZ
* Open. You can then make changes to the template in the Source Editor. 5Pc;5
o0C
*/ 8Al{+gx@?
v4TQX<0s
package com.tot.count; ktXM|#
?FZ HrA
/** l'rja.\
* P= BZ+6DS
* @author EU 6 oQ
*/ U+jOTq8 M
public class CountBean { e*kpdS~U&
private String countType; e(&v"}Ef`
int countId; Pbn*_/H
/** Creates a new instance of CountData */ x;.Jw6g
public CountBean() {} 9.M4o[
public void setCountType(String countTypes){ )
w5SUb
this.countType=countTypes; H7Rx>h_
} ?=msH=N<l
public void setCountId(int countIds){ /U*C\ xMm
this.countId=countIds; J1U/.`Oy
} !?jrf ]
A@
public String getCountType(){ M]
%?>G
return countType; p<FzJ
} O`kl\K*R7
public int getCountId(){ O/(`S<iip
return countId; }"H,h)T
} R%WCH?B<}
} yxQ1`'[CR
hh%-(HaLX3
CountCache.java B"w?;EeV.
a5^]20Fa
/* sE<V5`Z=
* CountCache.java 7aRi5
* $rBq"u=,0+
* Created on 2007年1月1日, 下午5:01 Pj^{|U2 1
* 05#1w#i
* To change this template, choose Tools | Options and locate the template under Y] _ruDIW
* the Source Creation and Management node. Right-click the template and choose 1-uxC^u?|#
* Open. You can then make changes to the template in the Source Editor. m9WDT
*/ &ywPuTt
~Ffo-Nd-
package com.tot.count; :RTC!spy
import java.util.*; 4Z=_,#h4.
/** tS5hv@9cWx
* #Vt%@*
i
* @author Jt<_zn_FG
*/ HRCT}
public class CountCache { ZQsJL\x[UK
public static LinkedList list=new LinkedList(); ~W'{p
/** Creates a new instance of CountCache */ /Iy]DU8
public CountCache() {} [!uG1 GJ>
public static void add(CountBean cb){ {6|G@""O
if(cb!=null){ 4[r0G+
list.add(cb); R?|.pq/Ln
} 10~k2{Z
} _/$Bpr{R
} 2#]#sZmk
c|y(2K)o[=
CountControl.java (Z q/
"Yv_B3p
/* qJs<#MQ2
* CountThread.java GW@;}m(
* :{v#'U/^
* Created on 2007年1月1日, 下午4:57 3{64 @s
* x,+{9
* To change this template, choose Tools | Options and locate the template under |bHelD|
* the Source Creation and Management node. Right-click the template and choose -UEZ#Q
* Open. You can then make changes to the template in the Source Editor. TDKki(o=~
*/ BLdvyVFx
ItVWO:x&v
package com.tot.count; %6,SKg p
import tot.db.DBUtils; &X ):4
import java.sql.*; -H@:*
/** B\=8_z
* P>C~
i:4n
* @author .Iw AK/QS
*/ drP=A~?&:
public class CountControl{ O2E/jj
private static long lastExecuteTime=0;//上次更新时间 Tya1/w4
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 w~A{(-
dx
/** Creates a new instance of CountThread */ rig,mv
public CountControl() {} o Q2Fjj
public synchronized void executeUpdate(){ F?*-4I-
Connection conn=null; M61xPq8y5
PreparedStatement ps=null; =pO^7g
try{ $E~`\o%Ev
conn = DBUtils.getConnection(); A*2jENgci
conn.setAutoCommit(false); 7M!I8C0!aO
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); HxV=F66"
for(int i=0;i<CountCache.list.size();i++){ XGWSdPJLr
CountBean cb=(CountBean)CountCache.list.getFirst(); 9'giU r
CountCache.list.removeFirst(); W=><)miQ@
ps.setInt(1, cb.getCountId()); @7]yl&LZ
ps.executeUpdate();⑴ oy=js -
//ps.addBatch();⑵ 1\~ "VF*{
} ?
7n`A >T
//int [] counts = ps.executeBatch();⑶ x b~yM%*c
conn.commit(); ,t?B+$E
}catch(Exception e){ |(E
FY\
e.printStackTrace(); Xll}x+'uZK
} finally{ O)*+="Rg
try{ O!#g<`r{K
if(ps!=null) { uAJx.>$b
ps.clearParameters(); NZLxHD]mp
ps.close(); I<mV+ex
ps=null; :D6
ON"6
} m)t;9J5
}catch(SQLException e){} :Zbg9`d*
DBUtils.closeConnection(conn); 2d #1=+V
} KNvZm;Q6
} gnOt+W8
public long getLast(){ mbTEp*H
return lastExecuteTime; QL&ZjSN
} gjwn7_
public void run(){ Eqd<