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>,i]
|Y
iR4"I7J
CountBean.java h\C1:0x{
MO]zf3f!
/* e{:
-N
* CountData.java |r*y63\T
* ~HctXe' x
* Created on 2007年1月1日, 下午4:44 8pmWw?
* T+V:vuK
* To change this template, choose Tools | Options and locate the template under 5=s|uuw/
* the Source Creation and Management node. Right-click the template and choose K/&
* Open. You can then make changes to the template in the Source Editor. Y(JZP\Tf_N
*/ L#V e[
T5[(vTp
package com.tot.count; Ornm3%p+e
lz).=N}m
/** P@etT8| V
* V2Z^W^
* @author +5ql`C
*/
X/!Y mV!
public class CountBean { CJ;D&qo
private String countType; ~N2 [j
int countId; i;2V
/** Creates a new instance of CountData */ B(@uJ^N
public CountBean() {} q!d7Ms{q
public void setCountType(String countTypes){ 8LtkP&Wx
this.countType=countTypes; Lz-(1~o
} 17rg!'+
public void setCountId(int countIds){ 5Shc$Awc!
this.countId=countIds; (i)O@Jve
} 5N>L|J2
public String getCountType(){ 5t-(MY
return countType; &I(3/u
} $a')i<m^g
public int getCountId(){ yX\~{%
return countId; N8wA">u
} !&8B8jHqA
} &53LJlL
Co
:JxuaM8
CountCache.java \p iz Vt
b<g9L4s
/* h>NuQo*
* CountCache.java *fDhNmQ `
* L{1PCs36c
* Created on 2007年1月1日, 下午5:01 .|6Wmn-uS
* k1^&;}/f:
* To change this template, choose Tools | Options and locate the template under F-?s8RD
* the Source Creation and Management node. Right-click the template and choose ][Cg8
* Open. You can then make changes to the template in the Source Editor. cj3P]2B#
*/ }
AHR7mu=
Daf;;
w
package com.tot.count; &W y9%
import java.util.*; 2)`4(38
/** 0o!Egq_
* $T'lWD *
* @author [{-;cpM\
*/ K30{Fcb< h
public class CountCache { 5
.bU2C
public static LinkedList list=new LinkedList(); r/ LgmVRn
/** Creates a new instance of CountCache */ /9u12R*<
public CountCache() {} ^X?3e1om
public static void add(CountBean cb){ [M.!7+$o
if(cb!=null){ _%aJ/Y0Cy
list.add(cb); P_c9v/
} .ktyA+r8v
} SnW>`
} _$qH\>se
LT '2446
CountControl.java ?F%,d{^
#.W<[KZf
/* 8<g9 ~L
* CountThread.java 3hzKd_
* k'{Bhi4
* Created on 2007年1月1日, 下午4:57 6SD9lgF*-
* &Sp2['a!
* To change this template, choose Tools | Options and locate the template under }W* q
* the Source Creation and Management node. Right-click the template and choose lZ }H?n%
* Open. You can then make changes to the template in the Source Editor. B}p{$g!
*/ }Ias7d?re
q6>%1~?
package com.tot.count; |lf,3/*jDB
import tot.db.DBUtils; g)~"-uQQ
import java.sql.*; k|
,F/:
/** #ANbhHG
* ~Wj.
4b*
* @author sq'bo8r
*/ w97%5[-T
public class CountControl{ 9rhl2E
private static long lastExecuteTime=0;//上次更新时间 eB*0})
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 B=+Py%
/** Creates a new instance of CountThread */ _ye74$#
public CountControl() {} NXDuO_#
public synchronized void executeUpdate(){ zH+a*R
Connection conn=null; CrI:TB>/"
PreparedStatement ps=null; },G5!3
try{ gflu!C6
conn = DBUtils.getConnection(); LYyOcb[x
conn.setAutoCommit(false); &,~Oi(SX5
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); aRF}FE,u
for(int i=0;i<CountCache.list.size();i++){ G$$y\e$
CountBean cb=(CountBean)CountCache.list.getFirst(); 4brKAqg.
CountCache.list.removeFirst(); pbePxOG
ps.setInt(1, cb.getCountId()); 4XXuj
ps.executeUpdate();⑴ loFApBD=$^
//ps.addBatch();⑵ sDnXgCcS!
} a@V`EEZ
//int [] counts = ps.executeBatch();⑶ W~FM^xR?p
conn.commit(); etWCMR
}catch(Exception e){ iqPMCOPZ
e.printStackTrace(); zU,Qph
,<
} finally{ V0!$k.Wk
try{ $4a;R I
if(ps!=null) { Rz9IjL.Z
ps.clearParameters(); ;/g Bjp]H
ps.close(); e2l!L*[g
ps=null; xRM)f93@
} g/6>>p`J
}catch(SQLException e){} =Hwlo!
DBUtils.closeConnection(conn); `z{sDe;
} m_g2Cep
} \bPSy0
public long getLast(){ w4e(p 3
return lastExecuteTime; {:0TiOP5x
} &`IC3O5
public void run(){ YE5B^sQ1
long now = System.currentTimeMillis(); qt!0#z8
if ((now - lastExecuteTime) > executeSep) { Ryrvu 1 k
//System.out.print("lastExecuteTime:"+lastExecuteTime); Zw<\^1
//System.out.print(" now:"+now+"\n"); ?m>!P@
M
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); [=q&5'FY0
lastExecuteTime=now; ^J-\s_)"
executeUpdate(); NhYce>
} U^.kp#x#
else{ 6<h
==I
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); zo~5(O@
} Y(3X5v?[
} ^TF71uo
} /I/gbmc)
//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 I c 2R\}q
Z0I>PBL@l
类写好了,下面是在JSP中如下调用。 ;Wu6f"+Y#
8\{1y:|
<% ~SN *
CountBean cb=new CountBean(); 85GU~.
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); C=>IJ'G
CountCache.add(cb); [uD G;We=
out.print(CountCache.list.size()+"<br>"); I@/+=
CountControl c=new CountControl(); Ri mz~}+
c.run(); L&L