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: )#Le"&D
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CountBean.java (Zz8 ldO
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/* 6BdK)s
* CountData.java ) -^(Su(!
* @j`gxM_-O
* Created on 2007年1月1日, 下午4:44 ?e#bq]
* L:_GpZ_
* To change this template, choose Tools | Options and locate the template under )jPIBzMys
* the Source Creation and Management node. Right-click the template and choose : =f!>_r+
* Open. You can then make changes to the template in the Source Editor. i1 >oRT{Z
*/ r T"3^,,
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package com.tot.count; [aF"5G
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/** |*%i]@V=
* + usB$=kJ
* @author gA:unsI
*/ _zK
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public class CountBean { Mc9J Fzp
private String countType; 1'YUK"i
int countId; =1+/`w
/** Creates a new instance of CountData */ X-y3CO:&@h
public CountBean() {} W QqOXF
public void setCountType(String countTypes){ 2Bz\Tsp
this.countType=countTypes; @:Emmzucv|
} <
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public void setCountId(int countIds){ dJF3]h Y
this.countId=countIds; E"zC6iYZ;
} k!"6mo@rd
public String getCountType(){ [:gp_Z&
return countType; ,v#O{ma
} {HtW`r1)Tt
public int getCountId(){ 4Ifz-t/
return countId; `rest_vu
} u\q(v D.
} Vj[hT~{f
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CountCache.java _ -|+k
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/* L]*5cH
* CountCache.java G$[Hm\V
* gx.\&W b
* Created on 2007年1月1日, 下午5:01 Yq>K1E|
* Ei4Iv#Oi`
* To change this template, choose Tools | Options and locate the template under ( _3QZ
* the Source Creation and Management node. Right-click the template and choose UB,0c)
* Open. You can then make changes to the template in the Source Editor. gE9x+g
*/ m(w 9s;<
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package com.tot.count; sV;q(,oru
import java.util.*; *M-'R*Np
/** &fW'_,-
* 3vHkhhYQ
* @author M=54xTh0Y
*/ Ce/D[%
public class CountCache { /V }Z,'+
public static LinkedList list=new LinkedList(); FA{'Ki`
/** Creates a new instance of CountCache */ meYGIP:n
public CountCache() {} v,!`A!{D
public static void add(CountBean cb){ *G8Z[ht%r
if(cb!=null){ X#o<))
list.add(cb); ?
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} =9;b|Y"aQ
} >VppM `
} +E']&v$
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CountControl.java c-* *~tb(
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/* ~U4Cf >
* CountThread.java b$sT`+4q
* |j4p
* Created on 2007年1月1日, 下午4:57 i3cMRcS;
* K!8l!FFl
* To change this template, choose Tools | Options and locate the template under ]sI\.a
* the Source Creation and Management node. Right-click the template and choose \c1>15
* Open. You can then make changes to the template in the Source Editor. bPIo9clq
*/ '=(D7F;
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package com.tot.count; @<yY Mo7
import tot.db.DBUtils; .I]EP-
import java.sql.*; %<|cWYM="z
/** 32Wa{LG;2
* 7NkMr8[}F
* @author LbuhKL}VN
*/ <tW/9}@p9
public class CountControl{ sB!6"D5
private static long lastExecuteTime=0;//上次更新时间 :<v@xOzxx
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 QT=i>X
/** Creates a new instance of CountThread */ G!Yt.M0
public CountControl() {} M5P3;
public synchronized void executeUpdate(){ 81!gp7c
Connection conn=null; +LlAGg]Z
PreparedStatement ps=null; I#'yy7J
try{ Dis kGq@T
conn = DBUtils.getConnection(); c`/kx
conn.setAutoCommit(false); Mp(;PbVD
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ';m;K
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for(int i=0;i<CountCache.list.size();i++){ iO"ZtkeNr
CountBean cb=(CountBean)CountCache.list.getFirst(); @O|`r(le
CountCache.list.removeFirst(); F_&H*kL L3
ps.setInt(1, cb.getCountId()); (
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ps.executeUpdate();⑴ &[
,*
//ps.addBatch();⑵ s^k<r;'\
} .LGA0
//int [] counts = ps.executeBatch();⑶ xyHv7u%*
conn.commit(); z'*{V\
}catch(Exception e){ (+}44Ldt
e.printStackTrace(); PbfgWGr
} finally{ U?ZWDr"*`w
try{ E)|Bl>
if(ps!=null) { fOdX2{7m
ps.clearParameters(); tF\_AvL_8
ps.close(); ANfy+@
ps=null; iu$Y0.H@
} _YN
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}catch(SQLException e){} g9Ty%|Q7(
DBUtils.closeConnection(conn); c<sq0('`
} 8T8]g M
} C=bQ2t=Z
public long getLast(){ U;M! jj
return lastExecuteTime; Tfx-h)oP3
} >*\yEH9"
public void run(){ g1 =>u
long now = System.currentTimeMillis(); nW`] =
if ((now - lastExecuteTime) > executeSep) { ^V7)V)Z;0
//System.out.print("lastExecuteTime:"+lastExecuteTime); |pBvy1e4)
//System.out.print(" now:"+now+"\n"); cYBjsN(!A|
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6!8uZ>u%Vg
lastExecuteTime=now; )@<HG$#
executeUpdate(); |{RCvm
} 9v1 Snr
else{ {;Oj
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 9m<%+S5&
} ge1U1o
} (hh^?
} AmQsay#I_
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 P<;Puww/
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类写好了,下面是在JSP中如下调用。 -J0OtrZ
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<% +11 oVW
CountBean cb=new CountBean(); sXtt$HID=
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "'XYW\bI
CountCache.add(cb); {1+meE
out.print(CountCache.list.size()+"<br>"); ":qS9vW
CountControl c=new CountControl(); $ab{GxmX'4
c.run(); jUDE)~h
out.print(CountCache.list.size()+"<br>"); B1]FB|0's
%>