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: HME`7 dw?
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CountBean.java v4VP7h6uD)
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/* }TG=ZVi
* CountData.java =j~Xrytn
* &6^QFqqW`-
* Created on 2007年1月1日, 下午4:44 /^':5"=o
* %Wa. 2s
* To change this template, choose Tools | Options and locate the template under _$m1?DZ
* the Source Creation and Management node. Right-click the template and choose =-;J2Qlg6
* Open. You can then make changes to the template in the Source Editor. L+Q.y~
*/ c4iGtW
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package com.tot.count; :tT6V(-W
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/** mH9_HK.C
* A;7At!kK
* @author tjbI*Pw7(
*/ Bn5$TiTcl
public class CountBean { J'@`+veE
private String countType; ,rWej;CzN
int countId; 4_d'Uh&]
/** Creates a new instance of CountData */ 6.k>J{GG
public CountBean() {} DwIX\9
public void setCountType(String countTypes){ KVp3pUO
this.countType=countTypes; Iz9b5
} E&>=
public void setCountId(int countIds){ W*9*^
this.countId=countIds; >=d%t6%(
} *d&+?!
public String getCountType(){ 8}{W.np_
return countType; m!Fx#
} s]2_d|Y
public int getCountId(){ m[D]4h9
return countId; >tTu1#t
} >.r> aH
} x"{WLZ
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CountCache.java Itv}TK
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/* siD/`T&
* CountCache.java oETl?Vt
* |%12Vr]J
* Created on 2007年1月1日, 下午5:01 0tEe
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* XG01g3
* To change this template, choose Tools | Options and locate the template under S(Q=2Y
* the Source Creation and Management node. Right-click the template and choose Qb?eA
* Open. You can then make changes to the template in the Source Editor. st wxF?\NS
*/ 1hW"#>f7
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package com.tot.count; MT{ovDA].
import java.util.*; yR[htD`
/** d'2q~
* _!E)a
* @author /Bp5^(s
*/ ^e(*{K;8
public class CountCache { 5?XIp6%x
public static LinkedList list=new LinkedList(); o>Q=V0?
/** Creates a new instance of CountCache */ OtZc;c
public CountCache() {} ;ji["b
public static void add(CountBean cb){ PiF &0;
if(cb!=null){ agj_l}=gO
list.add(cb); I:edLg1T
} XY!0yAK(!
} eWWfUNBSLX
} o((!3H{D
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CountControl.java dQJ)0!B
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/* r0,XR
* CountThread.java cc{^0JT
* BMYvxSsm
* Created on 2007年1月1日, 下午4:57 vY!'@W
* l9#@4Os
* To change this template, choose Tools | Options and locate the template under 4N8(WI"4S
* the Source Creation and Management node. Right-click the template and choose N'~l,{
* Open. You can then make changes to the template in the Source Editor. uc]`^,`2/
*/ \JbOT%1
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package com.tot.count; lB*HLC
import tot.db.DBUtils; 2JL\1=k;
import java.sql.*; .dKFQH iYJ
/** @ ('/NjTZ
* $$e"[g
* @author lky5%H
*/ ]4eIhj?
public class CountControl{ Eh&-b6:
private static long lastExecuteTime=0;//上次更新时间 ~zhP[qA})
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 5aJd:36I
/** Creates a new instance of CountThread */ #TPS?+(
public CountControl() {} 3NSX(gC%
public synchronized void executeUpdate(){ Z~v-@
Connection conn=null; jW;g{5X
PreparedStatement ps=null; <3!Q Xc
try{ tO+Lf2Ni+
conn = DBUtils.getConnection(); ].HHTCD`c
conn.setAutoCommit(false); m aOt/-
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); N;R I
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for(int i=0;i<CountCache.list.size();i++){ T7?cnK"
CountBean cb=(CountBean)CountCache.list.getFirst(); 0[.T`tpN'
CountCache.list.removeFirst(); ^0HgE;4
ps.setInt(1, cb.getCountId()); lw=!v%L
ps.executeUpdate();⑴ q#\4/Dt
//ps.addBatch();⑵ >!WH%J
} Dy|)u1?
//int [] counts = ps.executeBatch();⑶ 'f-8P
conn.commit(); /Jf}~}JP
}catch(Exception e){ >G}g=zy@
e.printStackTrace(); Jsf"h-)P
} finally{ $3]]<oH
try{ SGP)A(,k9
if(ps!=null) { 8:fq!m
ps.clearParameters(); U# U*^#
ps.close(); `l0"4[?
ps=null; U?=-V8#M|
} )jGB[s";)y
}catch(SQLException e){} Cq[<CPAS
DBUtils.closeConnection(conn); OBL2W\{
} <