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: ~`0=-Qkd
JP]-a!5Ru
CountBean.java 2W/*1K}
aOEW$%
/* l 1BAW$
* CountData.java qIO)<5\[%d
* ;F/s!bupCM
* Created on 2007年1月1日, 下午4:44 xoQqku"vn
* iH-(_$f;
* To change this template, choose Tools | Options and locate the template under 4EhWK;ra
* the Source Creation and Management node. Right-click the template and choose I=k`VI d:
* Open. You can then make changes to the template in the Source Editor. |jKFk.M
*/ 2p*L~! iM
n,p \~Tu,
package com.tot.count;
U.ew6`'Te
C-(O*hK
/** ?~; q r
* LEAU3doK;
* @author fh&Q(:ZU
*/ !6J+#
public class CountBean { :ZXaJ!
private String countType; |+1k7S,
int countId; z~jk_|?|?
/** Creates a new instance of CountData */ &qm:36Y7Xg
public CountBean() {} Eq5X/Hx
public void setCountType(String countTypes){ %,udZyO3uR
this.countType=countTypes; }jL4F$wC
} ItG|{Bo
public void setCountId(int countIds){ NDG?Xs [2
this.countId=countIds; "ZG2olOqLI
} [t]q#+Zs
public String getCountType(){ Jx8DVjy
return countType; Z}>+!Z
} )2bbG4:N
public int getCountId(){ >UV=k :Q
return countId; wR9gx-bE
4
} 0fa8.g#I$
} vARZwIu^D
p8z"Jn2P
CountCache.java ho6,&Bp8
k-$J #
/* _D1)_?`a@-
* CountCache.java oXGP6#
* ~0 L:c&V
* Created on 2007年1月1日, 下午5:01 02po;
* 9}11>X
* To change this template, choose Tools | Options and locate the template under JL?|NV-
* the Source Creation and Management node. Right-click the template and choose ]iaQD _'\
* Open. You can then make changes to the template in the Source Editor. ,u
*/ r6e!";w:U
ZRC7j?ui8`
package com.tot.count; v3]~*\!5
import java.util.*; buxyZV@1
/** U,,rB(
* P}D5 j
* @author XKbTjR
*/ S@C"tHD
public class CountCache { <##aD3)
public static LinkedList list=new LinkedList(); P~@I`r567
/** Creates a new instance of CountCache */ 'WoB\y569
public CountCache() {} ^ANz=`N5,
public static void add(CountBean cb){ mz^[C7(q'(
if(cb!=null){ Q0TKM>
list.add(cb); vpu
} NqN9
}
83:qIfF
} \3cg\Q+~
OLDEB.@
CountControl.java =5M
'+>
1i$OcN?x%
/* 6hqqZ
* CountThread.java T!Uf
PfEI
* %* @hS`
* Created on 2007年1月1日, 下午4:57 p;{w0uld"
* P/8z
* To change this template, choose Tools | Options and locate the template under fU4{4M+9"
* the Source Creation and Management node. Right-click the template and choose '59l.
* Open. You can then make changes to the template in the Source Editor. liVDBbS_A?
*/ 3$kElq[
bt?)ryu
package com.tot.count; ZHc;8|}
import tot.db.DBUtils; 7`K)7
import java.sql.*; 9S)A6]
/** 5$
rV0X,O
* S3YAc4
* @author ZRCUM"R_
*/ %l)~C%T
public class CountControl{ r A9Rz^;xa
private static long lastExecuteTime=0;//上次更新时间 Q37zBC0
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `O}bPwa{>
/** Creates a new instance of CountThread */ Z/I`XPmk
public CountControl() {} R]_fe4Y0
public synchronized void executeUpdate(){ hFt ~7R
Connection conn=null; 0"=}d y
PreparedStatement ps=null; x`p3I*_HT5
try{ :n(!,
conn = DBUtils.getConnection(); X] t *
conn.setAutoCommit(false); -!ERe@k(
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); SP5t=#M6
for(int i=0;i<CountCache.list.size();i++){ u5dyhx7
CountBean cb=(CountBean)CountCache.list.getFirst(); \EEU G^T
CountCache.list.removeFirst(); ?a-}1A{
ps.setInt(1, cb.getCountId()); XBHv V05mv
ps.executeUpdate();⑴ }i2dXC/
//ps.addBatch();⑵ WFpR@53Db
} ktK/s!bgY
//int [] counts = ps.executeBatch();⑶ &bS!>_9
conn.commit(); TWTRMc;z+
}catch(Exception e){ R$VeD1n@
e.printStackTrace(); }F
(lffb
} finally{ y1hJVYE2
try{ .(zZTyZr
if(ps!=null) { j_~lc,+m
ps.clearParameters(); hdee]qLS
ps.close(); w^QqYUL${
ps=null; {m<!-B95
} G3t
4$3|
}catch(SQLException e){} 0B~Q.tyP
DBUtils.closeConnection(conn); \{`*`WQF
} K?aUIkVs
} V3}$vKQ
public long getLast(){ =6+j
Po{F
return lastExecuteTime; N_>}UhZ
} XvW
$B|
public void run(){ 7q:
long now = System.currentTimeMillis(); M;qV%
k
if ((now - lastExecuteTime) > executeSep) { (3Z~EIZz
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9
!qVYU42(
//System.out.print(" now:"+now+"\n"); ^o*$+DbC
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); zs@[!?A,
lastExecuteTime=now; d@t3C8
executeUpdate(); yj{:%Km:`
} 98eS f
else{ MHKB:t]hA
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Gu9x4p
} j\8'P9~%
} EM.rO/qcW
} uDi#a~m@
//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 V/7?]?!xu
prg8Iq'w
类写好了,下面是在JSP中如下调用。 A)q,VSR8
4lfJc9J
<% "t"&6\
CountBean cb=new CountBean(); >zAI#N4
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); k|T0Bly3P
CountCache.add(cb); uP[:P?,t
out.print(CountCache.list.size()+"<br>"); &g<`i{_
CountControl c=new CountControl(); Jv=G3=.
c.run(); XS/5y(W
out.print(CountCache.list.size()+"<br>"); wY j~ (P"
%>