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: rsy'ZVLUj
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CountBean.java 1&U'pp|T
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/* .KTDQA\
* CountData.java :n{rVn}G
* @ U:WWTzf
* Created on 2007年1月1日, 下午4:44 c"77<Db$
* a{el1_DIGK
* To change this template, choose Tools | Options and locate the template under +#,t
* the Source Creation and Management node. Right-click the template and choose auaFP-$`f
* Open. You can then make changes to the template in the Source Editor. ~\Fde^1
*/ &I <R|a
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package com.tot.count; o7&Z4(V
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/** :G,GHU'/78
* H[fD
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* @author u;J9aKD
*/ \d]&}`'4{f
public class CountBean { 9F ).i
private String countType; wW]|ElYR=
int countId; oI/@w
/** Creates a new instance of CountData */ *
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public CountBean() {} ?r2Im5N
public void setCountType(String countTypes){ N{L ]H_=
this.countType=countTypes; E&GUg/d
} 5rfGMk<
public void setCountId(int countIds){ >c8zMd
this.countId=countIds; VBBqoyP
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} ;x|4Tm
public String getCountType(){
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return countType; l?Bv9k.^?
} 3eFD[c%mN
public int getCountId(){ ir3iW*5k
return countId; Jel%1'Dc^
} 1h"0B
} m-7^$
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CountCache.java z| i$eF;x3
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/* $BkdC'D
* CountCache.java ,dK% [
* ezC55nm
* Created on 2007年1月1日, 下午5:01 eNi.d;8F
* %ktU 51o
* To change this template, choose Tools | Options and locate the template under Y')in7g
* the Source Creation and Management node. Right-click the template and choose ukzXQe;l1
* Open. You can then make changes to the template in the Source Editor. _av%`bb&z9
*/ bXC;6xZV
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package com.tot.count; _dIv{L!
import java.util.*; _H<ur?G
/** -Y2h vC
* 'R,1Jmx
* @author *.n9D
*/ xGPt5l<M&
public class CountCache { Y&]pC
public static LinkedList list=new LinkedList(); AbcmI*y
/** Creates a new instance of CountCache */ ,Es5PmV@$%
public CountCache() {} I]jVnQ>&
public static void add(CountBean cb){ /vwGSuk._
if(cb!=null){ }NiJDs
list.add(cb); onHUi]yYu{
} T[~ak"M
} =/Vr,y$
} \CX`PZ><
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CountControl.java _+.z2} M
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/* @1^iWM j
* CountThread.java i,$*+2Z
* d+ql@e ]
* Created on 2007年1月1日, 下午4:57 /$/\$f$
* OB;AgE@
* To change this template, choose Tools | Options and locate the template under LtXFGPQ f
* the Source Creation and Management node. Right-click the template and choose V~NS<!+q
* Open. You can then make changes to the template in the Source Editor. 8{epy
*/ fW <qp
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package com.tot.count; e9o(hL
import tot.db.DBUtils; Cq}LKiu
import java.sql.*; "<txg%j\J
/** _ N.ZpKVu
* hXmW,+1
* @author rnEWTk7&
*/ :M'3U g$t
public class CountControl{ y~]>J^
private static long lastExecuteTime=0;//上次更新时间 UXR$ 7<D+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 pV:X_M6
/** Creates a new instance of CountThread */ M)i2)]FS
public CountControl() {} +wS?Z5%mU
public synchronized void executeUpdate(){ zT0FTAl^
Connection conn=null; /c]I|$v
PreparedStatement ps=null; }#a d
try{ +'y$XR~W {
conn = DBUtils.getConnection(); A
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conn.setAutoCommit(false); .y#@~H($
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); p@YU7_sF^!
for(int i=0;i<CountCache.list.size();i++){ ppmDmi~X
CountBean cb=(CountBean)CountCache.list.getFirst(); QVQe9{ "0
CountCache.list.removeFirst(); Ym2![FC1
ps.setInt(1, cb.getCountId()); 3'
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ps.executeUpdate();⑴ YDz:;Sp\
//ps.addBatch();⑵ sj0Hv d9
} AL3zE=BL
//int [] counts = ps.executeBatch();⑶ {[NBTT9&
conn.commit(); pR; AqDQ
}catch(Exception e){
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e.printStackTrace(); ko=vK%E[
} finally{ OqHD=D[
try{ {6 C!^ 5
if(ps!=null) { _LCK|H%v'
ps.clearParameters(); BQ2DQ7q
ps.close(); -jFvDf,M,D
ps=null; &,3.V+Sz
} G#
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}catch(SQLException e){} m80Q Mosp
DBUtils.closeConnection(conn); u\<