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: t;`ULp~&
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CountBean.java 3wg1wl|
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/* nNf*Q
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* CountData.java !j%uwje\
* B=~uJUr
* Created on 2007年1月1日, 下午4:44 |K" nSXzk
* Xk!wT2;
* To change this template, choose Tools | Options and locate the template under "7eL&
* the Source Creation and Management node. Right-click the template and choose kbo9nY1k
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* Open. You can then make changes to the template in the Source Editor. EQ.K+d*K][
*/ rv`GOta*
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package com.tot.count; a"`>J!
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/** Shv$"x:W
* s
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* @author qeb} ~FL"o
*/ 'uF75C
public class CountBean { `Tei
private String countType; %=$Knc_!T^
int countId; z;MPp#Y
/** Creates a new instance of CountData */ o=6 <?v7
public CountBean() {} 6Yc(|>b!
public void setCountType(String countTypes){ z,bK.KFSs
this.countType=countTypes; mZG n:f}=
} "dT"6,
public void setCountId(int countIds){ GG"6O_
this.countId=countIds; 'rTJ*1i
} :5BCW68le
public String getCountType(){ |>OBpb
return countType; 3.1%L"r[)
} fzA Fn$[
public int getCountId(){ [%O f
return countId; e)N<r
} Lz!JLiMEET
} hiEYIx
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CountCache.java 0X4)=sJP
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/* R1/c@HQw?
* CountCache.java Ql%B=vgKL
* <LzxnTx=
* Created on 2007年1月1日, 下午5:01 KMK8jJ
* E-($Xc
* To change this template, choose Tools | Options and locate the template under J_fs}Y1q\
* the Source Creation and Management node. Right-click the template and choose ;mRZ_^V;
* Open. You can then make changes to the template in the Source Editor. $7W5smW/
*/ uE<8L(*B
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package com.tot.count; 2r;h">
import java.util.*; g cB
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/** IUDH"~f
*
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* @author ;^u,[d
*/ cy)-Rfg
public class CountCache { 5Zd oem
public static LinkedList list=new LinkedList(); tv`b##
/** Creates a new instance of CountCache */ 5ba e-
public CountCache() {} P3n#s2o6y
public static void add(CountBean cb){ Qc)i?Z'6
if(cb!=null){ Bs` {qmbC
list.add(cb); d7mn(= &
} TOF V`7q;3
} '=%`;?j
} &3;"$P
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CountControl.java H(tC4'tA
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/* w-2#CX8jY
* CountThread.java _x1W\#
* TnKv)%VF
* Created on 2007年1月1日, 下午4:57 ]uMZvAjb
* _hJdC|/
* To change this template, choose Tools | Options and locate the template under vz>9jw:Y
* the Source Creation and Management node. Right-click the template and choose 'RhS%l
* Open. You can then make changes to the template in the Source Editor. ;6D3>Lm
*/ <7SE|
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package com.tot.count; RgUQ:
import tot.db.DBUtils; cm_5,wB(w
import java.sql.*; 4L ]4WVc
/** F[SZwMf29
* |JF,n~n
* @author ZI;*X~h
*/ 8>W52~^fU
public class CountControl{ :"Otsb7
private static long lastExecuteTime=0;//上次更新时间 *~shvtq
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 5>+@.hPX
/** Creates a new instance of CountThread */ 7<*0fy5n n
public CountControl() {} /3Gq&[R{
public synchronized void executeUpdate(){ li
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Connection conn=null; 8<mloM-4
PreparedStatement ps=null; ygj%VG
try{ iE
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conn = DBUtils.getConnection(); HR"clD\{Di
conn.setAutoCommit(false); gd]S;<Jh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); iQ(j_i'+!I
for(int i=0;i<CountCache.list.size();i++){ T#i;=NP"
CountBean cb=(CountBean)CountCache.list.getFirst(); dor1(@no|
CountCache.list.removeFirst(); XHj%U
ps.setInt(1, cb.getCountId()); >r7PK45.K
ps.executeUpdate();⑴ 8s2y!pn7Q
//ps.addBatch();⑵ _u^3uzu
} [j5+PV
//int [] counts = ps.executeBatch();⑶ hnB`+!
conn.commit(); a>W++8t1 ;
}catch(Exception e){ .\T!oSb4[
e.printStackTrace(); v]EZYEXFL)
} finally{ @vyEN.K%mm
try{ 3N-
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if(ps!=null) { b@8z+,_
ps.clearParameters(); <mlN\BcX;
ps.close(); w(aj' i
ps=null; \%Y`>x.
} H`fJ<So?
}catch(SQLException e){} /CO=!*7fz
DBUtils.closeConnection(conn); COu5Tu^
} K$,<<hl
} O50<h O]l
public long getLast(){ }A@:JR+|
return lastExecuteTime; J^yqu{
} BKtb@o~(
public void run(){ EjFpQ|-L|
long now = System.currentTimeMillis(); )Jk$j
if ((now - lastExecuteTime) > executeSep) { /7\q#qIm:
//System.out.print("lastExecuteTime:"+lastExecuteTime); =E]tEi
//System.out.print(" now:"+now+"\n"); jY%.t)>)
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 5NUaXQ
lastExecuteTime=now; RHn3\N
executeUpdate(); B
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} $%\6"P/64
else{ =|aZNHqH
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); gAorb\iJ
} G!sfp}qW
} 4]m{^z`1
} n/(}|xYU
//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 (>A#|N1U
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类写好了,下面是在JSP中如下调用。 R|(X_A
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<% +@!\3a4!
CountBean cb=new CountBean(); >'q]ypA1
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); -r<8mL:yW
CountCache.add(cb); Hy\q{
out.print(CountCache.list.size()+"<br>"); UakVmVN/P
CountControl c=new CountControl(); kP[fhOpn
c.run(); |3E|VGm~
out.print(CountCache.list.size()+"<br>"); Zl&ED{k<
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