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: h.)2,
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CountBean.java b("JgE`
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/* ?`F")y
* CountData.java #( nheL
* T0_9:I`&
* Created on 2007年1月1日, 下午4:44 /,v:!*
* |-7<?aw"
* To change this template, choose Tools | Options and locate the template under $"{V],:T
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* the Source Creation and Management node. Right-click the template and choose 4Uz:zB
* Open. You can then make changes to the template in the Source Editor. $8&HpX#h$
*/ vg5zsR0u
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package com.tot.count; 1at$_\{.(
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/** Y=G *[G#
* v\Y;)/!
* @author 1elx~5v1.=
*/ v >3ctP{
public class CountBean { ~4}m'#!
private String countType; )<.S3
int countId; }jd[>zk
/** Creates a new instance of CountData */ u2<:mu[|P
public CountBean() {} c7\bA7.
public void setCountType(String countTypes){ if5Y!Tx?G
this.countType=countTypes; 1jmhh!,
} jn\\,n"6
public void setCountId(int countIds){ af{;4Cr
this.countId=countIds; va8:QHdU
} [ur/`
public String getCountType(){ CjQ_oNI
return countType; QBto$!})
} q1dYiG.-Z
public int getCountId(){ z,rWj][P
return countId; qw87B!D
} 6X|KKsPzX
} >K\ 79<x|
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CountCache.java ">fgoDQ
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/* N#.IpY'7Ze
* CountCache.java '%RMpyK~
* aDZLabRu
* Created on 2007年1月1日, 下午5:01 c<&+[{|
* ^J%
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* To change this template, choose Tools | Options and locate the template under nBiSc*
* the Source Creation and Management node. Right-click the template and choose ,A6*EJ\w
* Open. You can then make changes to the template in the Source Editor. [F/x U
*/ !y] Y'j
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package com.tot.count; 6l_8Q w*5I
import java.util.*; ^\+6*YE 4
/** zx'`'t4~
* Fah}#,
* @author
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*/ 5h{Hf]A
public class CountCache { M3z7P.\G
public static LinkedList list=new LinkedList(); t*}<v@,
/** Creates a new instance of CountCache */ *Mp<4B
public CountCache() {} p`d:g
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public static void add(CountBean cb){ ^d=Z/d[
if(cb!=null){ +mxYz#reX
list.add(cb); ptDA))7M/
} +$
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} 9hguC yr@h
} moo>~F _^
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CountControl.java wUV%NZB
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/* 73<iK]*c
* CountThread.java 33;|52$
* ?,8b-U#A1
* Created on 2007年1月1日, 下午4:57 cEQa 6
* $OhL
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* To change this template, choose Tools | Options and locate the template under aEM#V
* the Source Creation and Management node. Right-click the template and choose <1LuYEDq
* Open. You can then make changes to the template in the Source Editor. oaXD^H\
*/ a #0{tZd
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package com.tot.count; >S3 >b
import tot.db.DBUtils; }N|/b"j9
import java.sql.*; (Z5#;rgem
/** H5%I?ZXw4
* PJ.jgN(r
* @author h/VYH(Tj
*/ Z"^@B2v
public class CountControl{ k %rP*b*
private static long lastExecuteTime=0;//上次更新时间 A&7jE:Ew
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [*<&]^
/** Creates a new instance of CountThread */ j w462h
public CountControl() {} N~kYT\$b#
public synchronized void executeUpdate(){ [aC9vEso!
Connection conn=null; ~zX5}U<R
PreparedStatement ps=null; aRwBxf
try{ v%- V|L
conn = DBUtils.getConnection(); >dGYZfqD
conn.setAutoCommit(false); igL^k`&5^"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); e+WVN5"ID>
for(int i=0;i<CountCache.list.size();i++){ ]mh+4k?b
CountBean cb=(CountBean)CountCache.list.getFirst(); Dw[Q,SE
CountCache.list.removeFirst(); TDGzXJf[
ps.setInt(1, cb.getCountId()); R}Y=!qjYE=
ps.executeUpdate();⑴ zK92:+^C
//ps.addBatch();⑵ z~5'p(|@f
} w6Q]?p+
//int [] counts = ps.executeBatch();⑶ BYf"l8^,
conn.commit(); jY.%~Y1y
}catch(Exception e){ ATHz~a
e.printStackTrace(); mTgn}rXk
} finally{ 1hWz%c|
try{ . gJKr
if(ps!=null) { p'4P2
ps.clearParameters(); jFv<]D%A[
ps.close(); \#r_H9&s6
ps=null; k#&SWp=
} ~] 2R+
}catch(SQLException e){} hzb|:
DBUtils.closeConnection(conn); LfApVUm
} %R>S"
} A{%;Hd`0/
public long getLast(){ ~4<3`l=A
return lastExecuteTime; Hv\*F51p=
}
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public void run(){ #VE$C3<
long now = System.currentTimeMillis(); xn8B|axB
if ((now - lastExecuteTime) > executeSep) { :bDA<B6bb
//System.out.print("lastExecuteTime:"+lastExecuteTime); A~V\r<N
j
//System.out.print(" now:"+now+"\n"); @k,(i=**
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6%#'X
lastExecuteTime=now; X%CPz.G
executeUpdate(); Z(M)2
} jYz3(mM'J
else{ '4sD1LD~}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); bicL%I2h
} E;H(jVZ
} |plo65
} =[+&({
//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 X~3P?O]kFv
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类写好了,下面是在JSP中如下调用。 y3]"H(
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<% MlE~gCD
CountBean cb=new CountBean(); ;%alZ
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); sLp
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CountCache.add(cb); Yj\yO(o/
out.print(CountCache.list.size()+"<br>"); `kSCH; mwP
CountControl c=new CountControl(); S(h*\we
c.run();
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out.print(CountCache.list.size()+"<br>"); 4>C=:w
%>