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: 4_lrg|X1
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CountBean.java 3}1u\(Mf
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/* T::85
* CountData.java t@;p
* Fo_sgv8O<
* Created on 2007年1月1日, 下午4:44 ajT*/L!0_
* kD%( _K5
* To change this template, choose Tools | Options and locate the template under 5DZ#9m/
* the Source Creation and Management node. Right-click the template and choose !qg`/y9
* Open. You can then make changes to the template in the Source Editor. Zi
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*/ Or+U@vAnk
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package com.tot.count; $%Kfq[Q
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/** =nS3p6>rZ
* q;CiV
* @author N+xP26D8
*/ ioCsV
public class CountBean { aXYY:;
private String countType; G` A4|+W"
int countId; RqrdAkg
/** Creates a new instance of CountData */ tk`v:t!6U
public CountBean() {} p6@)-2^
public void setCountType(String countTypes){ %> eiAB_b
this.countType=countTypes; 4$<JHo
@.
} "^-a M
public void setCountId(int countIds){ q9_OGd|P
this.countId=countIds; 4VSU8tK|N]
} w@E3ZL^
public String getCountType(){ ~0$&3a<n1
return countType; 9A=,E&
} F41=b4/
public int getCountId(){ (A#^l=su
return countId; a=2%4Wmz
} 0h_|t-9j
} cwg"c4V
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CountCache.java _D tV
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/* ICQKP1WFp
* CountCache.java i/4>2y9/F4
* :o3N;*o>)0
* Created on 2007年1月1日, 下午5:01 y)@wjH{6
* S1_RjMbYM
* To change this template, choose Tools | Options and locate the template under 0(HU}I
* the Source Creation and Management node. Right-click the template and choose lf,5w
* Open. You can then make changes to the template in the Source Editor. k,*XG$2h
*/ 4r}51 N\
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package com.tot.count; g7H(PF?
import java.util.*; fJg+ Ryo
/** (LCfUI6;
* WyiQoN'q
* @author upmx $H>
*/ HRA|q
public class CountCache { W=?<<dVYD
public static LinkedList list=new LinkedList(); a7opCmL
/** Creates a new instance of CountCache */ 2?Vd 5xkt
public CountCache() {} `a/`,N
public static void add(CountBean cb){ /n&&Um\
if(cb!=null){ SXh-A1t
list.add(cb); '&b+R`g'
} At;LO9T3z
} gSj,E8-g
} *;FdD{+
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CountControl.java ~xTt204S
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/* o mx=
* CountThread.java x8|J-8A(
* V7/Rby Q
* Created on 2007年1月1日, 下午4:57 BgT*icd8d
* DlJo^|5
* To change this template, choose Tools | Options and locate the template under bN.Pex
* the Source Creation and Management node. Right-click the template and choose HzJz+ x:
* Open. You can then make changes to the template in the Source Editor. 2~V*5~fb
*/ Q!3_$<5<E>
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package com.tot.count; i6Gu@( 8Q
import tot.db.DBUtils; v$9y,^p@e
import java.sql.*; K
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/** 1Y,Z
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* a+QpM*n7Lq
* @author *qq+jsA6wH
*/ '3;b@g,
public class CountControl{ (@YG~0
private static long lastExecuteTime=0;//上次更新时间 wd6owr
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 "@ n%Z
/** Creates a new instance of CountThread */ nk:)j:fr
public CountControl() {} l^}c!
public synchronized void executeUpdate(){ O/LXdz0B
Connection conn=null; HaYo!.(Fv
PreparedStatement ps=null; gqR(.Pu
try{ F0#
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conn = DBUtils.getConnection(); d;>QhoiL
conn.setAutoCommit(false); qQa}wcU'9p
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); CC`JZ.SO
for(int i=0;i<CountCache.list.size();i++){ I1J-)R+
CountBean cb=(CountBean)CountCache.list.getFirst(); v[<T]1=LRC
CountCache.list.removeFirst(); 9YGY,sx
ps.setInt(1, cb.getCountId()); 4M T 7 `sr
ps.executeUpdate();⑴ fQFk+C
//ps.addBatch();⑵ UF|p';oom
} ^J{:x
//int [] counts = ps.executeBatch();⑶ (<lhn
conn.commit(); CJyevMf'
}catch(Exception e){ Gm`8q}<I
e.printStackTrace(); (k P9hcV
} finally{ {`_i`
try{ kx CSs7J/
if(ps!=null) { \7_y%HR
ps.clearParameters(); n"8Yv~v*2j
ps.close(); {..6>fS
ps=null; L},_.$I?
} n+p }\msH
}catch(SQLException e){} p4QU9DF
DBUtils.closeConnection(conn); ~M$Wd2Th
} iDD$pd,e\
} $Kd>:f=A
public long getLast(){ ]###w;
return lastExecuteTime; xx $cnG
} @+DX.9
public void run(){ I 6O
long now = System.currentTimeMillis(); tBSW|0
if ((now - lastExecuteTime) > executeSep) { R-14=|7a-
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7Yy ;
//System.out.print(" now:"+now+"\n"); #z42C?V
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); "jCu6Rj d
lastExecuteTime=now; _Ey5n!0:
executeUpdate(); 8EY:tzw
} M\=2uKG#
else{ T{'RV0%
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); kT=8e;K
} D'4\*4is
} 8k79&|
} W3RT{\
//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 QL* IiFR
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类写好了,下面是在JSP中如下调用。 5-M-X#(
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<% ]^]wP]R_
CountBean cb=new CountBean(); ce(#2o&`
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); N g,j#
CountCache.add(cb); ;}t(Wnu.
out.print(CountCache.list.size()+"<br>"); QW"! (`K
CountControl c=new CountControl(); Ts9uL5i
c.run(); @ P|y{e6
out.print(CountCache.list.size()+"<br>"); Pc9H0\+Xk
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