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: __9673y
TwH(47|?Nt
CountBean.java ,9rT|:N
1/i|
/* K.%E=^~q
* CountData.java :J"e{|g',
* HCu1vjU(]
* Created on 2007年1月1日, 下午4:44 >}9TdP/oT
* uODsXi{z
* To change this template, choose Tools | Options and locate the template under \DHCf4,
* the Source Creation and Management node. Right-click the template and choose 7+ysE
* Open. You can then make changes to the template in the Source Editor. *~vRbD$q
*/ d+^;kse
YZk& 'w
package com.tot.count; n0m9|T&
cO8;2u,Gvi
/** _CZ* z
* [bcqaT
* @author ;?&;I!
*/ 'W#<8eJo
public class CountBean { l]ZUKy
private String countType; Z(.Tl M2h
int countId; d/^^8XUK
/** Creates a new instance of CountData */ VTHDGBU
public CountBean() {} -or9!:8
public void setCountType(String countTypes){ R%Z} J R.
this.countType=countTypes; Fg~,1[8w<
} Q.fBuF
public void setCountId(int countIds){ @|^Ch+%@
this.countId=countIds; LJ)3!Q/:
} bcZuV5F&
public String getCountType(){ F^\v`l,
return countType; Bj2rA.M
} brFOQU?
public int getCountId(){ 6!'yU=Z`
return countId; :eO]65N
} A+p}oY '
} P8EGd}2{8
mZ5UaSG
CountCache.java *be+x RY
ug{F?LW[
/* 2c~^|@
* CountCache.java ux }DWrR
* dlU=k9N-
* Created on 2007年1月1日, 下午5:01 T>z@;5C
* 936t6K&
* To change this template, choose Tools | Options and locate the template under 6y0C
* the Source Creation and Management node. Right-click the template and choose ~}5(J,1!
* Open. You can then make changes to the template in the Source Editor. wHCsEp(
*/ ufo?ZFq@$L
'ZJ6p0
package com.tot.count; u+V;r)J{
import java.util.*; <(iOzn
/** #:yZJS9f9
* nO/5X>A,Zw
* @author (tz! "K
*/ x4.
#_o&
public class CountCache { OY)x
Kca
public static LinkedList list=new LinkedList(); CV6H~t'1
/** Creates a new instance of CountCache */ 6nwO:?1o9
public CountCache() {} 5x: XXj"
public static void add(CountBean cb){ lC2xl( #!
if(cb!=null){ OU## A:gI
list.add(cb); 3o?Lz7L
} Ns $PS\
} h~1QmEat
} 9W8Dp?:
p-}:7CXP
CountControl.java 4S=lO?\"A
iaC$K@a{
/* }a`LOBne
* CountThread.java '-x%?Ll
* @!S$gTz
* Created on 2007年1月1日, 下午4:57 EAI[J&c
* :K~7BJ(HO
* To change this template, choose Tools | Options and locate the template under WZMsmhU@T
* the Source Creation and Management node. Right-click the template and choose c;e,)$)-|
* Open. You can then make changes to the template in the Source Editor. ?BRL;( x
*/ u>eu47"n!
+!<`$+W
package com.tot.count; W)_B(;$]
import tot.db.DBUtils; k9,"`dk@
import java.sql.*; l{R)yTO
/** Xu$*ZJ5w
* -1o1k-8d
* @author k (R4-"@
*/ 1Y`MJ\9
public class CountControl{ Ob+&!XTp?0
private static long lastExecuteTime=0;//上次更新时间 9f@)EKBK
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 0(kp>%mbB
/** Creates a new instance of CountThread */ /?GBp[(0
public CountControl() {} vZxy9Wmc
public synchronized void executeUpdate(){ 0jmlsC>
Connection conn=null; )Ga6O2:
PreparedStatement ps=null; M]'AA
Uo8
try{ ieI-_]|[
conn = DBUtils.getConnection(); H~@h
#6
conn.setAutoCommit(false); WIghP5% W
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :Ls36E8f=
for(int i=0;i<CountCache.list.size();i++){ BpC Sf.zZ
CountBean cb=(CountBean)CountCache.list.getFirst(); EAfSbK3z
CountCache.list.removeFirst(); u|ZO"t
ps.setInt(1, cb.getCountId()); 3LmHH
=
ps.executeUpdate();⑴ _H,RcpyJ
//ps.addBatch();⑵ 6i4j(P
} V;V9_qP,
//int [] counts = ps.executeBatch();⑶ c1^3lgPv
conn.commit(); p
c],H
}catch(Exception e){ +D@R'$N
e.printStackTrace(); ?,NAihN]
} finally{ "duJl-
try{ {x:IsQZ
if(ps!=null) { x#^kv)
ps.clearParameters(); r$7rYxFR
ps.close(); P#xn!fMi
ps=null; B]vj1m`9
} :-Pj )Y{I
}catch(SQLException e){} )N/KQ[W
DBUtils.closeConnection(conn); 7Tbk ti;
} F)@<ZE
} B_S3}g<~
public long getLast(){ bo2Od
return lastExecuteTime; RB"rx\u7K
} NO$Nl/XM
public void run(){ #q- _
long now = System.currentTimeMillis(); UXP;'
if ((now - lastExecuteTime) > executeSep) { 2KEww3.{
//System.out.print("lastExecuteTime:"+lastExecuteTime); - \QtE}|4
//System.out.print(" now:"+now+"\n"); `FwAlYJK
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); krA))cP
lastExecuteTime=now; El%(je,|
executeUpdate(); v<wT`hiKW
} eG v"&kr
else{ z-DpLV
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); dUZ&T