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: h
knobk
ph|3M<q6
CountBean.java O0Z'vbFG
+
6}FUi!"e
/* */S,CV
* CountData.java Yhx~5p
* MQ,2v.
vZ.
* Created on 2007年1月1日, 下午4:44 wDSU~\
* =lffr?#&B
* To change this template, choose Tools | Options and locate the template under c''!&;[!
* the Source Creation and Management node. Right-click the template and choose D1Fc7!TV
* Open. You can then make changes to the template in the Source Editor. !-7(.i -
*/ [Q%3=pm_
"w7:{E5e
package com.tot.count; =!{dKz-&
-'I)2/%g
/** "oTwMU
* J5l:_hZUV
* @author lOEbh
*/ *vj5J"Y(;t
public class CountBean { (d~'H{q
private String countType; ; aMMIp
int countId; WFh!re%Z
/** Creates a new instance of CountData */ `bx gg'V
public CountBean() {} r<0.!j%c
public void setCountType(String countTypes){ zPVA6~|l
this.countType=countTypes; N
.SszZh
} I015)vFc
public void setCountId(int countIds){ 9PGSr4V1
this.countId=countIds; 2h/`RefHJ
} Db3tI#
public String getCountType(){ ciXAyT cG
return countType; 3*'!,gK~[
} HWHGxg['r
public int getCountId(){ }LE/{]A
return countId; 'Y-c*q
} )qxL@w.
} M2m@N-+R
",K6zALJ
CountCache.java w)}[)}T!
7sFjO/a*
/* uS&bfx2
* CountCache.java /Db~-$K
* 1 8&^k|
* Created on 2007年1月1日, 下午5:01 S]9xqiJW
* 7zNyH(.
* To change this template, choose Tools | Options and locate the template under yX)2
hj:s
* the Source Creation and Management node. Right-click the template and choose x2nNkd0h
* Open. You can then make changes to the template in the Source Editor. 1ITa6vjS
*/ _Fer-nQ2R
au#IA
package com.tot.count; M9i u#6P
import java.util.*; XBDlQe|>
/** 6x.#K9@q4
* `5gcc7b
* @author y6Rg@L&U
*/ sF} E=lY
public class CountCache { %]:u ^\7
public static LinkedList list=new LinkedList(); q,m6$\g4
/** Creates a new instance of CountCache */ ]~|zY5i!
public CountCache() {} <vPIC G)
public static void add(CountBean cb){ \75%[;.
if(cb!=null){ Q#vur o
list.add(cb); ~Ipl'cE
} :,cSEST
} Ok,hm.|
} e0aeiG$/0
'|6j1i0x
CountControl.java $A ( #^&
.lj\H
/* Qn6&M
* CountThread.java 9oN b= .
* Qg4qjX](?
* Created on 2007年1月1日, 下午4:57 Ye,E7A*L
* Z*leEwgz
* To change this template, choose Tools | Options and locate the template under M~^|dR)D
* the Source Creation and Management node. Right-click the template and choose @90)
* Open. You can then make changes to the template in the Source Editor. >
^D10Nf*
*/ ]ErAa"?
4s3n|6 v
package com.tot.count; VdYu| w;v
import tot.db.DBUtils; ?}O\'Fa8
import java.sql.*; 7$/ O{GBJ
/** k%.IIVRx
* fRq2sK;+
* @author k ELV]iWb
*/ Wb^YqqE
public class CountControl{ p6>3
p
private static long lastExecuteTime=0;//上次更新时间 qex.}[
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Xd{"+'29
/** Creates a new instance of CountThread */ gx#TRp}-
public CountControl() {} :xv"m
{8+
public synchronized void executeUpdate(){ 3"cAwU9
Connection conn=null; yht_*7.lM
PreparedStatement ps=null; ;i\i+:=
try{ =)'AXtvE
conn = DBUtils.getConnection(); c7sW:Yzil
conn.setAutoCommit(false); T?Hs_u{
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /}(w{6C
for(int i=0;i<CountCache.list.size();i++){ S _1R]n1/
CountBean cb=(CountBean)CountCache.list.getFirst(); l'mgjv~
CountCache.list.removeFirst(); #W*5=Cf
ps.setInt(1, cb.getCountId()); Dy5'm?
ps.executeUpdate();⑴ ++5SofG@
//ps.addBatch();⑵ vrQ/Yf:\B
} E{1O<qO<