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: 8A~5@
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CountBean.java 3.Oc8(N^}
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/* J*vy-[w
* CountData.java |$`)d87,
* G'{$$+U^K
* Created on 2007年1月1日, 下午4:44 Py3Xvudv
* A]id*RtY
* To change this template, choose Tools | Options and locate the template under *tC]Z&5
* the Source Creation and Management node. Right-click the template and choose &.,ZU\`zT
* Open. You can then make changes to the template in the Source Editor. >jD,%yG
*/ |W];8
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package com.tot.count; hiZE8?0+~N
. T6fPEb
/** q$ (@
* L1
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* @author (iXo\y`z
*/ N:[22`NP
public class CountBean { T0J"Wr>WY
private String countType; M.iR5Uh
int countId; i Tg?JoE2
/** Creates a new instance of CountData */ VHGOVH,
public CountBean() {} Hr |De8#f
public void setCountType(String countTypes){ k>I[U}h
this.countType=countTypes; 9=p^E# d
} })rJU/
public void setCountId(int countIds){ B`3RyM"J @
this.countId=countIds; [4KW64%l
} ![YLY&}s
public String getCountType(){ tt2`N3Eu\
return countType; { K'QE0'x
} xL,Lb}){%
public int getCountId(){ ^R',P(@oL
return countId; -]\cUQ0
} (\}>+qS[
} ^|M\vO
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CountCache.java Yj99[
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/* !r]elX
* CountCache.java }>Gnpc
* P~$FgAV
* Created on 2007年1月1日, 下午5:01 {h5 S=b
* ;O5p>o
* To change this template, choose Tools | Options and locate the template under 6Y<'Lyg/
* the Source Creation and Management node. Right-click the template and choose _R-[*ucq
* Open. You can then make changes to the template in the Source Editor. L5=Tj4`
*/ {KYbsD
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package com.tot.count; ,y@`wq>O
import java.util.*; >Ng7q?h
/** ^_BHgbS%;
* JfS:K'
* @author SV*h9LL
*/ &"]Uh
public class CountCache { C50&SrnBU1
public static LinkedList list=new LinkedList(); lL_M=td8W
/** Creates a new instance of CountCache */ GInU7y904
public CountCache() {} teh$W<C
public static void add(CountBean cb){ Q|/uL`_ni
if(cb!=null){ 8q*MhH>6I
list.add(cb); U9GmkXRix
} R
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} -7\Rl3c
} SEsc"l8
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CountControl.java R
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/* <20rxOEnf
* CountThread.java JbN@AX:%
* ^c",!Lp}{
* Created on 2007年1月1日, 下午4:57 Mr'P0^^
* /Ud<4j-
* To change this template, choose Tools | Options and locate the template under LnZzY0
* the Source Creation and Management node. Right-click the template and choose qd\5S*Z1
* Open. You can then make changes to the template in the Source Editor. Cj^:8 ?%
*/ Gu}
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package com.tot.count; A;VjMfoB
import tot.db.DBUtils; &Ohm]g8{2
import java.sql.*; FRa@TN/Ic
/** )QS4Z{)U
* uJ;7]
* @author 1d)wE4c=Z
*/ wO:!B\e
public class CountControl{ f@U\2r
private static long lastExecuteTime=0;//上次更新时间 5A(zQ'6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 CMI'y(GN
/** Creates a new instance of CountThread */ -=_bXco}
public CountControl() {} P{2V@ <}
public synchronized void executeUpdate(){ o|#Mq"od
Connection conn=null; PR rf$& u
PreparedStatement ps=null; 8`Wj 1 ,q
try{ Omy4Rkj8bh
conn = DBUtils.getConnection(); b=[gK|fu
conn.setAutoCommit(false); `;Qw/xl_N
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); t<S]YA~N'
for(int i=0;i<CountCache.list.size();i++){ W'2T7ha Es
CountBean cb=(CountBean)CountCache.list.getFirst(); za{z2#aJ
CountCache.list.removeFirst(); Us4J[MW<
ps.setInt(1, cb.getCountId()); 34S|[PXd
ps.executeUpdate();⑴
7-a[W
//ps.addBatch();⑵ ($a ?zJr
} zs#s"e:jeR
//int [] counts = ps.executeBatch();⑶ h'Tn&2r6
conn.commit(); Q|40
8EM
}catch(Exception e){ X"QIH|qx-
e.printStackTrace(); fh~"A`d
} finally{ R Fgy
try{ q;co53.+P)
if(ps!=null) { a(}dF?M=
ps.clearParameters(); 01v7_*'R
ps.close(); >s#[dr\ww
ps=null; eeIaH
>
} @j
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}catch(SQLException e){} 7w}D2|+
DBUtils.closeConnection(conn); x:'M\c7
} ~3k& =3d]
} l|#WQXs*c{
public long getLast(){ OU)~
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return lastExecuteTime; ;A^0="x&
} jwsl"zL
public void run(){ 1 o<l;:
long now = System.currentTimeMillis(); 0Y rdu,c
if ((now - lastExecuteTime) > executeSep) { RiHOX&-7
//System.out.print("lastExecuteTime:"+lastExecuteTime); Wn;B ~
//System.out.print(" now:"+now+"\n"); a^yBtb~,P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lZT9 SDtS
lastExecuteTime=now; h{zE;!+)D
executeUpdate(); /Mk85C79
} @**@W[EM
else{ a& >(*PQ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ua$H"(#c
} |,zcrOo]
} QmQsNcF~z
} f8]Qn8
//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 ]y&w