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: &>W$6>@
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CountBean.java Ma']?Rb`
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/* bP$dU,@p~
* CountData.java i0kak`x0
* ;LPfXpR
* Created on 2007年1月1日, 下午4:44 &4x}ppX
* H0gbSd+
* To change this template, choose Tools | Options and locate the template under N&+x+;Kx
* the Source Creation and Management node. Right-click the template and choose RVA(Q[ ;
* Open. You can then make changes to the template in the Source Editor. ;yLu R
*/ {{D)YldtA
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package com.tot.count; RSyUaA
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/** O1U= X:Zl
* $m{:C;UH
* @author rv^@, 8vq
*/ aFb==73aLw
public class CountBean { 6azGhxh
private String countType; n,V[eW#m'L
int countId; *K6g\f]b #
/** Creates a new instance of CountData */ Vvn2 Ep
public CountBean() {} %Ycy{`
public void setCountType(String countTypes){ Hz1%x
this.countType=countTypes; FxtQXu-g
} +mmSfuO&\
public void setCountId(int countIds){ fF$<7O)+]
this.countId=countIds; jrlVvzZ
} Pg0x/X{t
public String getCountType(){ tqvN0vY5
return countType; h-#6av:
} a LroD$#
public int getCountId(){ .9 on@S
return countId; LqoB 10Kc\
} Pmr5S4Ka
} pMx*F@&nU
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CountCache.java _"Dv
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/* /og=IF2:
* CountCache.java L
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* =)H.cuc
* Created on 2007年1月1日, 下午5:01 Xtq_y'I
* zU kgG61
* To change this template, choose Tools | Options and locate the template under 2\A$6N;_
* the Source Creation and Management node. Right-click the template and choose %Q__!D[
* Open. You can then make changes to the template in the Source Editor. q1$N>;&
*/ 8rnwXPBN
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package com.tot.count; 0U(@=7V
import java.util.*; ^EtMxF@D
/** n71r_S*
* *KZYv=s,u
* @author ~NrG`
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*/ qOIyub
public class CountCache { 8\@m
- E!{
public static LinkedList list=new LinkedList(); T6y\|
/** Creates a new instance of CountCache */ $B2J
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public CountCache() {} [i21FX
public static void add(CountBean cb){ GfxZ'VIn
if(cb!=null){ *)$Uvw E
list.add(cb); X:f UI4
} p,5i)nEFj
} )Ys x}vS Z
} y2Q&s9$Do
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CountControl.java n$MO4s8)
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/* G, }Yl
* CountThread.java Fd%#78UEo}
* <,3a3
* Created on 2007年1月1日, 下午4:57 !P2ro~0/
* "(3[+W{|
* To change this template, choose Tools | Options and locate the template under aq>kTaz
* the Source Creation and Management node. Right-click the template and choose =m]v8`g
* Open. You can then make changes to the template in the Source Editor. pxA?
*/ x77*c._3v
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package com.tot.count; fbyd"(V8r
import tot.db.DBUtils; oM
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import java.sql.*; >2Y=*K,:
/** !4ocZmj\
* _>o:R$ %}
* @author iQ0KfoG?U
*/ $f$SNx)),
public class CountControl{ lB8-Z ow
private static long lastExecuteTime=0;//上次更新时间 iOf<$f
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 XnH05LQ
/** Creates a new instance of CountThread */ rP'me2
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public CountControl() {} 0G(/Wb"/
public synchronized void executeUpdate(){ sbfuzpg]*
Connection conn=null; '9%\;
PreparedStatement ps=null; F0m-23[H
try{ +i6GHBn~J
conn = DBUtils.getConnection(); &Gc9VF]o
conn.setAutoCommit(false); IY1//9
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); {Ea
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for(int i=0;i<CountCache.list.size();i++){ ,=uD^n:
CountBean cb=(CountBean)CountCache.list.getFirst(); =?5]()'*n
CountCache.list.removeFirst(); !K#qe Y}
ps.setInt(1, cb.getCountId()); K$z2YJ%
ps.executeUpdate();⑴ 3RUy,s
//ps.addBatch();⑵ xW+6qtG`
} [XN={
//int [] counts = ps.executeBatch();⑶ b;L\EB
conn.commit(); k<z)WNBf
}catch(Exception e){ 5G}?fSQ>
e.printStackTrace(); }czrj%6
} finally{ E[OJ+ ;c
try{ {% 6}'
if(ps!=null) { a1+oj7
ps.clearParameters(); g9OY<w5s]
ps.close(); >e
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ps=null; 2bz2KB5>
} ;2G*wR
}catch(SQLException e){} OUE(I3_
DBUtils.closeConnection(conn); R-
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} UB@Rs|)
} Od,=mO*.Q
public long getLast(){ zg>zUe
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return lastExecuteTime; p;a,#IJu
} vN}#Kc\
public void run(){ DmK57V4L^
long now = System.currentTimeMillis(); >[f?vrz
if ((now - lastExecuteTime) > executeSep) { #-rH1h3*q
//System.out.print("lastExecuteTime:"+lastExecuteTime); 0mp/Le5
//System.out.print(" now:"+now+"\n"); '(6z.
toQ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); . P viA
lastExecuteTime=now; `6;?9NI
executeUpdate(); Brw@g8w-X
} |*Yr<zt
else{ 5"VTK
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); +D6YR$_<
} rE7G{WII
} xH4m|
} q~Hn-5H4Q
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 MBK^FR-K
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类写好了,下面是在JSP中如下调用。 ;7*[Bcj.
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<% @)F )S7
CountBean cb=new CountBean(); E,Z$pKL?
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); D_ 2:k'4
CountCache.add(cb); 2y\E[j A
out.print(CountCache.list.size()+"<br>"); d7^}tM
CountControl c=new CountControl(); $GV7o{"&
c.run(); K`eCDvlH
out.print(CountCache.list.size()+"<br>"); Z{.8^u1I
%>