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: \No22Je6d
X>jwjRK
$
CountBean.java Iq":
U
9aqFdlbY
/* ~?A,GalS
* CountData.java cmh/a~vYaY
* #iGz&S3iN$
* Created on 2007年1月1日, 下午4:44 P3XP=G`E
* NOmSLIgt7
* To change this template, choose Tools | Options and locate the template under j1toV$)P
* the Source Creation and Management node. Right-click the template and choose 1/qiE{NW
* Open. You can then make changes to the template in the Source Editor. [laX~(ND{
*/ .yj=*N.
48%a${Nvvj
package com.tot.count; Ah2XwFg?
@p2dXJeR<
/** =09j1:''<d
* *DoEDw
* @author ~h[lu^ZSi
*/ {_MU0=7c\
public class CountBean { ' *p-`
private String countType; J>Rt2K
int countId; 8CSvg{B
/** Creates a new instance of CountData */ !c`Q?aGV)
public CountBean() {} 0\}j[-`pF
public void setCountType(String countTypes){ PuABS>.;
this.countType=countTypes; ~KfjT
p#
} `TsfscN
public void setCountId(int countIds){ l1_X5DI
this.countId=countIds; m~NWY$oI9[
} Xhkw<XbV
public String getCountType(){ &akMj@4;R
return countType; s9:2aLZ{
} Y.*lO
public int getCountId(){ Q}Vho.N@=
return countId; !%M-w0vC9
} 1aMBCh<}JN
} |QgXSe7
;%z0iZmg
CountCache.java 0Rk'sEX,
01q7n`o#zf
/* @%cJjZ5y
* CountCache.java "RX?"pB
* {}^ELw
* Created on 2007年1月1日, 下午5:01 x!.VWG tb
* FZ2-e
* To change this template, choose Tools | Options and locate the template under hJ4.:
* the Source Creation and Management node. Right-click the template and choose >a-+7{};
* Open. You can then make changes to the template in the Source Editor. YL=k&QG
*/ gS|xicq!
}EIwkz8
package com.tot.count; 6$dm-BI
import java.util.*; $-AvH(@
/** 1k%ko?
* Yh%wf3
UEO
* @author Tk2kis(n
*/ g4$%)0x%
public class CountCache { Zz&i0r
public static LinkedList list=new LinkedList(); &s;%(c04A
/** Creates a new instance of CountCache */
pn7 :")Zx
public CountCache() {} A>g$[
public static void add(CountBean cb){ |uZ=S]V@
if(cb!=null){ tr/dd&(Y1
list.add(cb); y?@Y\ b
} q@-qA]
} 7VXeu+-P
} 835Upj>
CGe'z
CountControl.java lM1!2d'P
R39R$\
/* 5)oIPHXw
* CountThread.java lqCn5|S]
* g^4FzJ
* Created on 2007年1月1日, 下午4:57 =U2Te
* .}<B*e=y
* To change this template, choose Tools | Options and locate the template under 9iy|=
* the Source Creation and Management node. Right-click the template and choose @
:4Kk
4g1
* Open. You can then make changes to the template in the Source Editor. pNJM]-D]m~
*/ .-Lqo=o\
n1/lE)
package com.tot.count; Wkk Nyg,
import tot.db.DBUtils; 1;gSf.naG
import java.sql.*; 2!otVz!Mh
/** ">QY'r
* uWInx6p
* @author QPcB_wUqu
*/ >oNk(.
%
public class CountControl{ Z%{f[|h9}
private static long lastExecuteTime=0;//上次更新时间 GDB>!ukg
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 h*9o_
/** Creates a new instance of CountThread */ ~+C#c,Nw
public CountControl() {} uRy6~'
public synchronized void executeUpdate(){ |)-:w?
Connection conn=null; ?mAw"Rb!
PreparedStatement ps=null; LG|,g3&
try{ c6m,oS^
conn = DBUtils.getConnection(); w;$+7
conn.setAutoCommit(false); JAz;_wS(k
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -N(MEzAE
for(int i=0;i<CountCache.list.size();i++){ ">9CN$]J
CountBean cb=(CountBean)CountCache.list.getFirst(); y4L9Cxvs
CountCache.list.removeFirst(); NFc8"7Mz}
ps.setInt(1, cb.getCountId()); a!K;8#xc
ps.executeUpdate();⑴ A,e^bM
//ps.addBatch();⑵ _MEv*Q@o
} %S#"pKE6R
//int [] counts = ps.executeBatch();⑶ L>b,}w
conn.commit(); EG.C2]Fi
}catch(Exception e){ R7{hoqI2
e.printStackTrace(); \IfgL$+
} finally{ (B-9M)
try{ 5w1[KO#K|
if(ps!=null) { ,R =VzP&
ps.clearParameters(); ~\G3l,4
ps.close(); sD3|Qj;
ps=null; xH[yIfHkG@
} fdG.=7`
}catch(SQLException e){} 6I#DlAU@v
DBUtils.closeConnection(conn); $IT9@}*{
} wcf_5T
} ACYn87tq
public long getLast(){ rfi`Bp
return lastExecuteTime; FO=1P7
} m_ m@>}ud
public void run(){ OP}p;(
long now = System.currentTimeMillis(); \AzcW;03g[
if ((now - lastExecuteTime) > executeSep) { AyO|9!F@A
//System.out.print("lastExecuteTime:"+lastExecuteTime); _[o^23Hj
//System.out.print(" now:"+now+"\n"); Ig KAD#2a
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); h,'+w
lastExecuteTime=now; @EZONKT
executeUpdate(); l5ds`uR#
} }z+"3A|
else{ [1^wy#
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); yo,!u\^x
} r&sOM_BUF
} p&mtKLv
} G9inNz*Cx
//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 Fd&!-`T?
=+S3S{\CK
类写好了,下面是在JSP中如下调用。 z44~5J]
SYPMoE!U:
<% l|em E
^
CountBean cb=new CountBean(); \q'fB?bS^
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); )N6[rw<