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: oRm L
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CountBean.java nHnK)9\ N
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/* 7]U"Z*
* CountData.java h;C5hU4P
* *rM^;4Zt
* Created on 2007年1月1日, 下午4:44 ,0~^>K
* G"-?&)M#a
* To change this template, choose Tools | Options and locate the template under (7mAt3n
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* the Source Creation and Management node. Right-click the template and choose (|[2J3ZET
* Open. You can then make changes to the template in the Source Editor. @oNH@a
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*/ *? 5*m+
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package com.tot.count; EY^1Y3D w0
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/** gFeO}otm
* kW2sY^Rg
* @author j-4VB_N@
*/ AYt%`Y.!
public class CountBean { 3C?f(J}
private String countType; xHUsFms
int countId; `n#H5Oyn
/** Creates a new instance of CountData */ )#BMTKA^
public CountBean() {} &v$rn#l
public void setCountType(String countTypes){ TC@s
this.countType=countTypes; Ee)T1~;W
} >QjAoDVX?
public void setCountId(int countIds){ X}=n:Ql'YY
this.countId=countIds; ^`*9QjY
} Y'c>:;JEe
public String getCountType(){
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return countType; D8inB+/-
} !S^AgZ~
public int getCountId(){ T m_bz&Q
return countId; yWg@v+
} T_s_p
} Y#!UPhg<
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CountCache.java I!^;8Pg
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/* J4QXz[dG
* CountCache.java 931bA&SL=/
* aH 4c02s$
* Created on 2007年1月1日, 下午5:01 E[2m&3&
* 33o9Yg|J~
* To change this template, choose Tools | Options and locate the template under V^7V[(~`
* the Source Creation and Management node. Right-click the template and choose bt"W(m&f
* Open. You can then make changes to the template in the Source Editor. Ov};e
*/ Z,RzN5eN
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package com.tot.count; 8J=?5
import java.util.*; .Obw|V-
/** udxFz2>_l$
* J5di[nu
* @author gi(H]|=a
*/ NgADKrDU
public class CountCache { $LKIT0
public static LinkedList list=new LinkedList(); }O/U;4Z
/** Creates a new instance of CountCache */ $Wjww-mx
public CountCache() {} W,4QzcQR
public static void add(CountBean cb){ '= _/ 1F*q
if(cb!=null){ !2 LCLN\
list.add(cb); NMW#AZVd
} kjW+QT?T&
} ZO!I.
} Qt iDTr
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CountControl.java ~"!]
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/* Y,GU%[+
* CountThread.java ks3`3q 7
* TMAJb+@l:
* Created on 2007年1月1日, 下午4:57 " W!M[qBW
* qHsUP;7
* To change this template, choose Tools | Options and locate the template under k>F'ypm
* the Source Creation and Management node. Right-click the template and choose us;YV<)d
* Open. You can then make changes to the template in the Source Editor. y)F;zW<+
*/ ~res V
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package com.tot.count; (hTCK8HK
import tot.db.DBUtils; JIOh#VNU
import java.sql.*; \ ,7f6:
/** wAX1l*`
* O#x*iI%
* @author 3 j!3E
*/ b_,|>U
public class CountControl{ uXI_M)
private static long lastExecuteTime=0;//上次更新时间 &K[_J
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3t`P@nL0;
/** Creates a new instance of CountThread */ IYqBQnX}oM
public CountControl() {} @En^wN
public synchronized void executeUpdate(){ ]Oh@,V8
Connection conn=null;
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PreparedStatement ps=null; aHs^tPg
try{ 6,"IDH|ND
conn = DBUtils.getConnection(); =CK4.
conn.setAutoCommit(false); 5j:0Yt
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); w<C#Bka
for(int i=0;i<CountCache.list.size();i++){ h"Xg;(K
CountBean cb=(CountBean)CountCache.list.getFirst(); g+DzscIT
CountCache.list.removeFirst(); 9!f/aI
ps.setInt(1, cb.getCountId()); uG?_< mun
ps.executeUpdate();⑴ $u7;TW6QD
//ps.addBatch();⑵ l=]cy-H
} aY3^C q(r
//int [] counts = ps.executeBatch();⑶ v$~QU{&
conn.commit(); ?;KKw*
}catch(Exception e){ zw+B9PYqX
e.printStackTrace(); &yGaCq;0
} finally{ $h^wG)s2P
try{ ,^?^dB
if(ps!=null) { |s)Rxq){"V
ps.clearParameters(); 8
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ps.close(); ,O.3&Nz,c
ps=null; -c(F 1l
} 0FGe=$vD
}catch(SQLException e){} Uh.oErHQD
DBUtils.closeConnection(conn); y@ ML/9X8q
} hD\rtW
} 2GFLnz
public long getLast(){ `o<'
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return lastExecuteTime; =2[7
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} EzDk}uKY0R
public void run(){ )_1zRT| 9
long now = System.currentTimeMillis(); =2Bg9!zW>
if ((now - lastExecuteTime) > executeSep) { JQ}$Aqk
//System.out.print("lastExecuteTime:"+lastExecuteTime); dODt(J}%
//System.out.print(" now:"+now+"\n"); L~_9_9c
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Z= jr-)kK
lastExecuteTime=now; g$(
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executeUpdate(); qi;f^9M%
} q/4YS0CqE
else{ I*LknU@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); k:*S&$S!E
} -9"['-WH,
} 'I_Qb$
} 0zo?eI
//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 NxjB/N
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类写好了,下面是在JSP中如下调用。 /[O(ea$U
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<% kspTp>~
CountBean cb=new CountBean(); =jSb'Vu|
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); A~Y^VEn
CountCache.add(cb); RMX:9aQ3F
out.print(CountCache.list.size()+"<br>"); 6;C3RU]
CountControl c=new CountControl(); :q=%1~Idla
c.run(); #~SP)Ukp
out.print(CountCache.list.size()+"<br>"); 1=#q5dZ]
%>