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: +7^w9G
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CountBean.java tnJ`D4
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/* d3(+ztmG!
* CountData.java w'XSb.\)_m
* x{j+}'9
* Created on 2007年1月1日, 下午4:44 ++gPv}:$X
* L:^Y@[f
* To change this template, choose Tools | Options and locate the template under R/rcXX7%
* the Source Creation and Management node. Right-click the template and choose *V<)p%l.
* Open. You can then make changes to the template in the Source Editor. 3l+|&q[v
*/ 0@w&J9yG
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package com.tot.count; /rOnm=P+Q
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/** d}pGeU'
* F*.
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* @author \CDAFu#
*/ P 4H*jy@?
public class CountBean { aYR\ <02
private String countType; 9Mnem*
int countId; epYj+T
/** Creates a new instance of CountData */ sI4QI\*4
public CountBean() {} wNbTM.@
public void setCountType(String countTypes){ P2 |}*h5(
this.countType=countTypes; g\qX7nIH?
} (\tq<h0
public void setCountId(int countIds){ FfjC
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this.countId=countIds; O2$!'!hz
} }il%AAI9}r
public String getCountType(){ cS5w +`,L
return countType; zK,~ 37)\
} "wF*O"WQo
public int getCountId(){ Ag<4r
return countId; c.\:peDk
} svF*@(-P#
} [KD}U-(Wg
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CountCache.java A?\h|u<
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/* ;g6 nHek
* CountCache.java I?A~zigO
* 7/4~>D&-b
* Created on 2007年1月1日, 下午5:01 RlPjki"Mg
* +<H !3sW
* To change this template, choose Tools | Options and locate the template under YdPlN];[
* the Source Creation and Management node. Right-click the template and choose vW9^hbdx
* Open. You can then make changes to the template in the Source Editor. FV`3,NFk
*/ @f-0X1C."N
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package com.tot.count; y+l<vJu
import java.util.*; ST#PMb'izn
/** h=:*7>}
* qmQFHC_
* @author Lax9
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*/ 7eTA`@v5A
public class CountCache { ozT._C
public static LinkedList list=new LinkedList(); T..-)kL+p
/** Creates a new instance of CountCache */ 69N1 mP
public CountCache() {} >Zi|$@7t-
public static void add(CountBean cb){ K~P76jAe$
if(cb!=null){ HE9.
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list.add(cb); "MW55OWYU
} kVy"+ZebK
} >>/nuWdpO
} 1a \=0=[
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CountControl.java {c.}fyN
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/* OX'/?B((
* CountThread.java qdKh6{
* }o~Tw?z-|
* Created on 2007年1月1日, 下午4:57 )kFme=;
* ^.nwc#
* To change this template, choose Tools | Options and locate the template under %
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* the Source Creation and Management node. Right-click the template and choose 3L%Y"4(mm
* Open. You can then make changes to the template in the Source Editor. D
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*/ goG]WGVr
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package com.tot.count; 1OuSH+
import tot.db.DBUtils; ^Z#<tN;
import java.sql.*; 7MR:X#2v>
/** :k Rv
* pIk4V/fy
* @author avF&F
*/ f:)]FHPB1
public class CountControl{ h;&&@5@lM
private static long lastExecuteTime=0;//上次更新时间 0;.e#(`-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 e&r+w!
/** Creates a new instance of CountThread */ |j\eBCnH3
public CountControl() {} OFJJ-4[_3
public synchronized void executeUpdate(){ c }g$1of87
Connection conn=null; z1z=P%WK
PreparedStatement ps=null; \UVT_=Y
try{ g`y/_
conn = DBUtils.getConnection(); b#bO=T$e-
conn.setAutoCommit(false); 89 _&X[X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (\5<GCW-
for(int i=0;i<CountCache.list.size();i++){ Lx|w~+k}
CountBean cb=(CountBean)CountCache.list.getFirst(); JI28}Cxs0
CountCache.list.removeFirst(); Nj! R9N
ps.setInt(1, cb.getCountId()); ZYpD8u6U
ps.executeUpdate();⑴ h+\$Z]
//ps.addBatch();⑵ &