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: }?,YE5~
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CountBean.java we[+6Z6J
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/* H2%Qu<Kg2
* CountData.java hhaiHi!$
* ,2$<Pt;
* Created on 2007年1月1日, 下午4:44 Qu[QcB{ro-
* IrQ.[?C
* To change this template, choose Tools | Options and locate the template under 8)bR\s
* the Source Creation and Management node. Right-click the template and choose 2c]"*Pb
* Open. You can then make changes to the template in the Source Editor. N<i5X.X
*/ 2|^@=.4\
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package com.tot.count; iH4LZ
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/** )XN%pn
* LH2B*8=^2
* @author NH|I>vyN
*/ g_cED15
public class CountBean { `{:Nt#7
private String countType; E;CM"Y*
int countId; OU UV8K
/** Creates a new instance of CountData */ x7/Vf,N
public CountBean() {} rb-ao\
public void setCountType(String countTypes){ Cg]|x+
this.countType=countTypes; |:5O|m '
} N\*oL*[j
public void setCountId(int countIds){ 4+q,[m-$(
this.countId=countIds; q~
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} ?)-6~p 4N
public String getCountType(){ 73rme,
return countType; N_K9H1r
} N_NN0
public int getCountId(){ ^}Vc||S
return countId; _ +DL
} je^VJ&ac
} G/p\MzDko
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CountCache.java yF(9=z"?
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/* 3XlQ 4
* CountCache.java 0RA#Y(IR
* QIMd`c
* Created on 2007年1月1日, 下午5:01 &zF>5@fM
* ,5 ka{Q`K
* To change this template, choose Tools | Options and locate the template under X1(ds*'Kv
* the Source Creation and Management node. Right-click the template and choose pRV.\*:c
* Open. You can then make changes to the template in the Source Editor. "b`#RohCi
*/ E2r5Pg
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package com.tot.count; <&b,%O
import java.util.*; Zzjx;SF
/** xF!IT"5D
* 9f0`HvHC
* @author !6-t_S
*/ HjA~3l7
public class CountCache { P?V+<c{
public static LinkedList list=new LinkedList(); N9 M}H#
/** Creates a new instance of CountCache */ 5z0Sns
public CountCache() {} 5go)D+6s
public static void add(CountBean cb){ XA#qBxp/h
if(cb!=null){ RL4|!HzR
list.add(cb); =? !FO'zt"
} ~$6` e:n
} &6CDIxH{
} NOs00 H
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CountControl.java dYISjk@
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/* y/S3ZJY
* CountThread.java .)tQ&2
* Jf2JGTcm
* Created on 2007年1月1日, 下午4:57 JvXuN~fI{[
* cZN<}n+q
* To change this template, choose Tools | Options and locate the template under {D8opepO)
* the Source Creation and Management node. Right-click the template and choose <!m.+
* Open. You can then make changes to the template in the Source Editor. X$;x2mz nM
*/ DtBvfYO8)>
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package com.tot.count; Vyi.:lL _8
import tot.db.DBUtils; jX4$PfOhR
import java.sql.*; ?cWwt~N9
/** <UO[*_,\
* tLKf]5}f
* @author ?wkT=mv
*/ 6P@K]jy& n
public class CountControl{ vWmt<E|e
private static long lastExecuteTime=0;//上次更新时间 uzQj+Po
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 *P\lzM
/** Creates a new instance of CountThread */ =A,T:!}'
public CountControl() {} yH:p*|% :
public synchronized void executeUpdate(){ _}47U7s8
Connection conn=null; 2|?U%YrHWs
PreparedStatement ps=null; On
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try{ 8cZ[Kl%
conn = DBUtils.getConnection(); uG'S&8i_
conn.setAutoCommit(false); N>EMVUVS
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); `&x>2FJ
for(int i=0;i<CountCache.list.size();i++){ U^[AW$WzU
CountBean cb=(CountBean)CountCache.list.getFirst(); K+/wJ9^B
CountCache.list.removeFirst(); =W')jKe0
ps.setInt(1, cb.getCountId()); /NB|N*}O)
ps.executeUpdate();⑴ |^Yz*r?BJ
//ps.addBatch();⑵ U&(gNuR>J
} V1Ft3Msq
//int [] counts = ps.executeBatch();⑶ /kr|}`#
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conn.commit(); T*B`8P
}catch(Exception e){ f8K0/z
e.printStackTrace(); &to~#.qc
} finally{ aW_Y
try{ Edc3YSg%;
if(ps!=null) { IX
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ps.clearParameters(); q@S\R
7R
ps.close(); roriNr/e
ps=null; EpACd8Fb
} 9qi|)!!L
}catch(SQLException e){} IV1O/lGp
DBUtils.closeConnection(conn); WllQM,h
} lhE]KdE3
} jEx8G3EL
public long getLast(){ 8rJf2zL
return lastExecuteTime; !j #8zN
} c<q33dZ!*
public void run(){ oEZhKVyc.y
long now = System.currentTimeMillis(); jN=
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if ((now - lastExecuteTime) > executeSep) { !RLXB$@`
//System.out.print("lastExecuteTime:"+lastExecuteTime); OJydt; a
//System.out.print(" now:"+now+"\n"); ulg= ,+%r
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); YJwI@E(l$
lastExecuteTime=now; (O:&RAkk7
executeUpdate(); g]MgT-C|
} b~ig$!N]
else{ @~=d4Wj6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |'}r-}
} USgO`l\}4
} m(xyEU
} P"Q6 wdm
//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 aY,'^S
/55 3v;l<
类写好了,下面是在JSP中如下调用。 'g<FL`iP
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<% #Ph8?
CountBean cb=new CountBean(); hE,-CIRg
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); um".Z4S
CountCache.add(cb); r<dvo%I#|
out.print(CountCache.list.size()+"<br>"); Lrt~Q:z2u
CountControl c=new CountControl(); h|z59h&X8G
c.run(); w2!5TKZ`
out.print(CountCache.list.size()+"<br>"); /sB,)>X
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