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: T 9lk&7W
U-+%e:v
CountBean.java haj\Dm
G+Vlaa/7
/* O%:EPdoU
* CountData.java 1%W|>M`
* h!#!}|Q'
* Created on 2007年1月1日, 下午4:44 +Ja9p
* 38(Cj~u=3
* To change this template, choose Tools | Options and locate the template under 0>PO4WFVJ
* the Source Creation and Management node. Right-click the template and choose &Z
Ja}5k!r
* Open. You can then make changes to the template in the Source Editor. ?Uz7($}
*/ F^Q[P4>m\
\VJ7ahg[\
package com.tot.count; f?xc-lX5R
n- cEa/g
/** 49Sq)jd<
* G}.t!"
* @author <3]Qrjl
,b
*/ &j2fh!\4
public class CountBean { -4:L[.2
private String countType; 8GC(?#Kb
int countId; ZT@a2:&
/** Creates a new instance of CountData */ 9H~{2Un
public CountBean() {} >we/#C"x
public void setCountType(String countTypes){ |UbwPL_L
this.countType=countTypes; RJMrSz$
} K]q9wR'q
public void setCountId(int countIds){ G4Y]fzC
this.countId=countIds; n[2[V*| mI
} H}KJd5A7
public String getCountType(){ hGc')
return countType; nx<q]Juv\
} !Pmv
public int getCountId(){ Epm'u[wV
return countId; U4hsbraz
} 23a&m04Rk
} |
?Js)i
y@!kp*0
CountCache.java =\IcUY,4
E%L]ifA9!
/* a8fLj
* CountCache.java eZ~^Z8F[6
* mUi|vq)`=D
* Created on 2007年1月1日, 下午5:01 oL' :07_
* }<Y3jQnl
* To change this template, choose Tools | Options and locate the template under -B\`O*Q
* the Source Creation and Management node. Right-click the template and choose wzAp`Zs2Dm
* Open. You can then make changes to the template in the Source Editor. _"`wUMee
*/ C 3`2{1
_tE$a3`
package com.tot.count; )F;[
import java.util.*; )i; y4S
/** U4*5o~!=S
* ?9q{b\=l
* @author gM|X":j
*/ p\e*eV1dxx
public class CountCache { &,':@OQ
public static LinkedList list=new LinkedList(); (bo{vX
/** Creates a new instance of CountCache */ Tr}@fa
public CountCache() {} Rkfr4
public static void add(CountBean cb){ O'JH=
'
if(cb!=null){ 8<u_ wt@
list.add(cb); ~S Js2-2
} 6USet`#
} BzH7E[R49
} ]zVe% Wa
UC*<]
CountControl.java [_j.pMH/P
FE1dr_i
/* ,2?"W8,
* CountThread.java DSix(bs9
* 7<{Zq8)
* Created on 2007年1月1日, 下午4:57 n15c1=gs
* zx{\SU
* To change this template, choose Tools | Options and locate the template under Qwx}e\=
* the Source Creation and Management node. Right-click the template and choose hD\C[C,
* Open. You can then make changes to the template in the Source Editor. Cm}ZeQ
*/ Jg|3Wjq5
lqPRUkin
package com.tot.count; 9&}qie,
import tot.db.DBUtils; 2q# t/oN3T
import java.sql.*; LJZEM;;}
/** hBLg;"=Em
* \`x'r$CV
* @author +7+
VbsFG
*/ V]}/e!XK\
public class CountControl{ #UU}lG
private static long lastExecuteTime=0;//上次更新时间 a(Z" }m
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 K@*m6)
/** Creates a new instance of CountThread */ e,I-u'mLQs
public CountControl() {} M:?eK
[h
public synchronized void executeUpdate(){ M 0->
Connection conn=null; ?MeP<5\A
PreparedStatement ps=null; K1z"..(2J
try{ f7OfN#I
conn = DBUtils.getConnection(); fx.FHhVu
conn.setAutoCommit(false); UeE& 8{=d
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); T4Z("
for(int i=0;i<CountCache.list.size();i++){ ]@ETQ8QN
CountBean cb=(CountBean)CountCache.list.getFirst();
~PuPY:"
CountCache.list.removeFirst(); 0*:]eM};P
ps.setInt(1, cb.getCountId()); 1`_Mc ]
ps.executeUpdate();⑴ -<&"geJA
//ps.addBatch();⑵ O\OG~`HBN
} )." zBc#
//int [] counts = ps.executeBatch();⑶ )2F:l0g
conn.commit(); k`
(_~/#
}catch(Exception e){ c<JJuG
e.printStackTrace(); /]]\jj#^
} finally{ 1;L!g*!E
try{ 6?}8z
q[
if(ps!=null) { R|NmkqTK~(
ps.clearParameters(); Jb $PlOQ
ps.close(); OAw/
ps=null; $Ry
NM2YI
} /[nt=#+
}catch(SQLException e){} J+?xfg
DBUtils.closeConnection(conn); \ox:/-[c\<
} Kr]!BI?z
}
=sG(l
public long getLast(){ N!RyncJ
return lastExecuteTime; wrsETB
c
} \"Sqr(~_
public void run(){ ? dSrY
long now = System.currentTimeMillis(); 2%vwC]A
if ((now - lastExecuteTime) > executeSep) { ,O
a)
//System.out.print("lastExecuteTime:"+lastExecuteTime); @uY%;%Pa8
//System.out.print(" now:"+now+"\n"); M~N'z/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); x+yt|
&B
lastExecuteTime=now; Q'~;RE%T
executeUpdate(); "@`mPe/
} :Np&G4IM>
else{ Ev0V\tl>0
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =NJb9S&8A
} `!m+g0
} ['-ln)96.
} N.eSf
//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 7SAu">lIl
L1)?5D
类写好了,下面是在JSP中如下调用。 >R !^aJ
D>*%zz|
<% y''? yr
CountBean cb=new CountBean(); ew?UHV
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); S2jo@bp!
CountCache.add(cb); by6E
"7%
out.print(CountCache.list.size()+"<br>"); `5 e#9@/e
CountControl c=new CountControl(); NqqLRgMOR'
c.run(); z8z U3?
out.print(CountCache.list.size()+"<br>"); wm2Q(l*HH
%>