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: l>H G|ol
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CountBean.java #!h +K"wX
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/* x?|C-v
* CountData.java c[a1
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* qUW>qi,
* Created on 2007年1月1日, 下午4:44 vU|.Gw
* %uV bI'n)
* To change this template, choose Tools | Options and locate the template under dE[_]2];P
* the Source Creation and Management node. Right-click the template and choose m{ya%F
* Open. You can then make changes to the template in the Source Editor. ^Z9v_qB
*/ =z]8;<=pL
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package com.tot.count; 4
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/** &;V3[
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* IdvBQ [Gj
* @author x>$!R\Cj
*/ YflotlT}
public class CountBean { 1V@\L|Y
private String countType; E\%'/3o
int countId; INHN=KY{
/** Creates a new instance of CountData */ o}iqLe\
public CountBean() {} s\-^vj3
public void setCountType(String countTypes){ N$jI&SI?}
this.countType=countTypes; [xVE0l*\
} ;7F|g
public void setCountId(int countIds){ H$
sNp\[{
this.countId=countIds; 4]\t6,Cz8
} 9hG+?
public String getCountType(){ YBX7WZCR
return countType; i"rrM1/r
} !`VO#_TJ
public int getCountId(){ &M,"%w!
return countId; Z_^v#FJ'l
} C~5-E{i
} E9Q?@' h
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CountCache.java qwb`8o
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/* >Kd(.r[Er
* CountCache.java (5"BKu1t
* cZ"
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* Created on 2007年1月1日, 下午5:01 's]+.3">L1
* B) 81mcy
* To change this template, choose Tools | Options and locate the template under \I\'c.$I.Y
* the Source Creation and Management node. Right-click the template and choose @QAyXwp
* Open. You can then make changes to the template in the Source Editor. wmNc)P4
*/ `P `nqn
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package com.tot.count; +njE
import java.util.*; oadlyqlw#
/** =](c7HEQf
* kUJ\AK
* @author GQ-owH]
*/ \bh3 &Z'.
public class CountCache { h&!k!Su3#
public static LinkedList list=new LinkedList(); "~h.u
/** Creates a new instance of CountCache */ aBM'ROQ
public CountCache() {} #"M 'Cs
public static void add(CountBean cb){ C/P,W>8
if(cb!=null){ {C%/>e2-%
list.add(cb); N_vVEIO9
} %@!Vx
} HY]vaA`
} 5k`[a93T
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CountControl.java tVhY=X{N?
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/* t[6 g9 e$
* CountThread.java S?{|qlpy
* Sa&~\!0t
* Created on 2007年1月1日, 下午4:57
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* ?l_>rSly5
* To change this template, choose Tools | Options and locate the template under mu1oD;lQ
* the Source Creation and Management node. Right-click the template and choose pGi "*oZD
* Open. You can then make changes to the template in the Source Editor. }9=\#Le~\
*/ O_f|R1G5z
o} #nf$v(
package com.tot.count; 9 Byk/&$U
import tot.db.DBUtils; Z`xz |:D+
import java.sql.*; PL8{|Q
/** F}Bc +i#]
* iSxxy1R
* @author 'JEZ;9}
*/ TJ9,c2d+
public class CountControl{ _%s _w)
private static long lastExecuteTime=0;//上次更新时间 B{ NKDkDH
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 FhB^E$r%
/** Creates a new instance of CountThread */ Vgs( feGs
public CountControl() {} JF*JFOb
public synchronized void executeUpdate(){ F9e$2J)C
Connection conn=null; W%09.bF
PreparedStatement ps=null; ]lF'o&v]
try{ jlER_I]
conn = DBUtils.getConnection(); :^SpKe(7
conn.setAutoCommit(false); ->}K- n ),
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qEE3x>&T]
for(int i=0;i<CountCache.list.size();i++){ z9$x9u
CountBean cb=(CountBean)CountCache.list.getFirst(); VEd#LSh
CountCache.list.removeFirst(); O0"i>}g4
ps.setInt(1, cb.getCountId()); 1h\: Lj
ps.executeUpdate();⑴ oKTIoTb
//ps.addBatch();⑵ _QtqQ~f
}
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//int [] counts = ps.executeBatch();⑶ Iz2K
conn.commit(); 3V`K^X3
}catch(Exception e){ vi0% jsI
e.printStackTrace(); u+s#Fee I
} finally{ L6j
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try{ $*%Ml+H-
if(ps!=null) { UD*#!H
ps.clearParameters(); @Qx|!%
ps.close(); d@"eWvnlZ
ps=null; -!MDYj +U
} 8Es]WR5
^
}catch(SQLException e){} b]s=Uv#)
DBUtils.closeConnection(conn); mW 5L;>
} 0+8ThZ?n
} %_1~z[Dv
public long getLast(){ /-$`GT?l
return lastExecuteTime; Fm-W@
} 3h";
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public void run(){ O6;>]/`
long now = System.currentTimeMillis(); C[rYVa
.
if ((now - lastExecuteTime) > executeSep) { Y[T;j p(k
//System.out.print("lastExecuteTime:"+lastExecuteTime); Ii*v(`2b
//System.out.print(" now:"+now+"\n"); )?pin|_x
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); hzPx8sO
lastExecuteTime=now; 5vYh~|
executeUpdate(); "h7-nwm
} hC]c
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else{ jjvm<;lv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); .,,?[TI
} 5%?La`C9[
} P,iLqat
} )X\.Xr-6q
//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 5DyN=[b
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类写好了,下面是在JSP中如下调用。 *^c4q|G.-
v! @/
<% ItKwB+my
CountBean cb=new CountBean(); 1elcP`N1
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]qXHalHY
CountCache.add(cb); FTCp3g
out.print(CountCache.list.size()+"<br>"); -ihF)^"a
CountControl c=new CountControl(); }#<Sq57n
c.run(); ;y6Jo
out.print(CountCache.list.size()+"<br>"); 5vbnO]8
%>