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: Fuz'!
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CountBean.java JZo18^aD"'
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/* zAZ+'9LB
* CountData.java ' 1 }ybSG
* s-Z<
* Created on 2007年1月1日, 下午4:44 >,9ah"K_x
* wDv G5
* To change this template, choose Tools | Options and locate the template under pz hPEp;
* the Source Creation and Management node. Right-click the template and choose kA"|PtrW
* Open. You can then make changes to the template in the Source Editor. j@Ta\a-,x
*/ Vq IzDs
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package com.tot.count; ^5GyW`a}
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/** XHh!Q0v;
* 1^HmM"DD
* @author u alpm#GU
*/ 4#D<#!]^
public class CountBean { ,(@J Ntx
private String countType; M SnRx*-
int countId; g0Ff$-#7
/** Creates a new instance of CountData */ :kU-ol$
public CountBean() {} *6`};ASK
public void setCountType(String countTypes){ BKV,V/*p
this.countType=countTypes; (*K=&e0O
} ?=dp]E{
public void setCountId(int countIds){ MB!_G[R
this.countId=countIds; [wO|P{8\"
} blk4@pg
public String getCountType(){ u^ 3,~:E
return countType; JQ~[$OGH
} SJJ[y"GvD
public int getCountId(){ "C/X#y
return countId; &Rp/y%9
} )ZQ>h{}D
} gic!yhsS_
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CountCache.java r-s9]0"7~
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/* ( Ev=kO
* CountCache.java %@~;PS3kd
* TpH-_ft
* Created on 2007年1月1日, 下午5:01 L|*0
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* Dga;GYx
* To change this template, choose Tools | Options and locate the template under (X3}&aLF
* the Source Creation and Management node. Right-click the template and choose 9 \lSN5W
* Open. You can then make changes to the template in the Source Editor. ? koIZ
*/ k0(_0o
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package com.tot.count; ?s-Z3{k
import java.util.*; 5{Oq* |
/** wR%F>[6.{
* DCheG7lo{
* @author s$wIL//=
*/ }HKt{k&$
public class CountCache { v(`9+*
public static LinkedList list=new LinkedList(); 1Uaj}=@M
/** Creates a new instance of CountCache */ 5@-[[ $dk
public CountCache() {} >3qfo2K0
public static void add(CountBean cb){ csd~)a nb
if(cb!=null){ GD-cP5$
list.add(cb); Zn{Y+ce7d
} {u(( y D
} TCL XO0
} 8-u #<D .
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CountControl.java Klj -dz
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/* Rh :|ij>B
* CountThread.java "2=v:\~=
* #7r13$>!
* Created on 2007年1月1日, 下午4:57 ]5',`~jkF
* 8fSY@
* To change this template, choose Tools | Options and locate the template under =MjkD)l
* the Source Creation and Management node. Right-click the template and choose v 1VH&~e
* Open. You can then make changes to the template in the Source Editor. %nV6#pr
*/ 1$#1
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package com.tot.count; O\+b1+&b3Y
import tot.db.DBUtils; 53<.Knw5a
import java.sql.*; p&$O}AX|
/** /_[?i"GW
* Z4s+8cTHn
* @author WXs?2S*
*/ kQw%Wpuq[/
public class CountControl{ h3rVa6cxM
private static long lastExecuteTime=0;//上次更新时间 QF4)@ r{2x
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9q ]n&5
/** Creates a new instance of CountThread */ k4-S:kVo
public CountControl() {} ;W?mQUo:P8
public synchronized void executeUpdate(){ (&!RX.i
Connection conn=null; Ial"nV0>0
PreparedStatement ps=null; wM1&_%N
try{ 5kik+
conn = DBUtils.getConnection(); &Sdf0"
conn.setAutoCommit(false); 3]li3B'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )qua0'y]@
for(int i=0;i<CountCache.list.size();i++){ X#<+D1P
CountBean cb=(CountBean)CountCache.list.getFirst(); !!+LFe4su
CountCache.list.removeFirst(); ;wa#m1
ps.setInt(1, cb.getCountId()); VD~
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ps.executeUpdate();⑴ "8iIOeY-\
//ps.addBatch();⑵ P}=U
#AV4
} '>k1h.i
//int [] counts = ps.executeBatch();⑶ FI"KJk'
conn.commit(); M3VTzwuf^S
}catch(Exception e){ `>Ms7G9S~e
e.printStackTrace(); -xVZm8y
} finally{ W
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try{ hYbaVE
if(ps!=null) { nt_FqUJ
ps.clearParameters(); W+I""I*mV
ps.close(); bk|?>yd
ps=null; !<vy!pXg
} /d*[za'0
}catch(SQLException e){} p5aqlYb6r
DBUtils.closeConnection(conn); $U4[a:
} &>xz
} k![oJ.vHD
public long getLast(){ \OwCZ!`7i
return lastExecuteTime; s=>^ 8[0O
} "BZL*hHq
public void run(){ ENy$sS6[D
long now = System.currentTimeMillis(); jx#9
if ((now - lastExecuteTime) > executeSep) { yioX^`Fc(~
//System.out.print("lastExecuteTime:"+lastExecuteTime); )4R[C={
//System.out.print(" now:"+now+"\n"); *M-'R*Np
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &fW'_,-
lastExecuteTime=now; 3vHkhhYQ
executeUpdate(); }Ud'j'QMy
} Ce/D[%
else{ /V }Z,'+
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); FA{'Ki`
} meYGIP:n
} v,!`A!{D
} *G8Z[ht%r
//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 R0urt
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类写好了,下面是在JSP中如下调用。 5fy{!
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<% quS]26wQz
CountBean cb=new CountBean(); i1 c[Gk.o
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); wpD}#LRfm
CountCache.add(cb); eExI3"|Q
out.print(CountCache.list.size()+"<br>"); x^Zm:Jrw~
CountControl c=new CountControl(); 48_( 'z*>
c.run(); }.D adV
out.print(CountCache.list.size()+"<br>"); x~ID[
%>