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: `B\KS*Gya#
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CountBean.java o:8S$F`O@
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/* -`dxx)x
* CountData.java ZBR^[OXO
* 3>9 dJx4I
* Created on 2007年1月1日, 下午4:44 #IaBl?}r^
* $Kz\
h#}
* To change this template, choose Tools | Options and locate the template under NB5L{Gf6-
* the Source Creation and Management node. Right-click the template and choose OF<n T
* Open. You can then make changes to the template in the Source Editor. 90iW-"l+[
*/ l ~4e2xoT
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package com.tot.count; N~}v:rK>g
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/** ;D"P9b]9$
* s$>m0^
* @author :+
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*/ 8U2wH
public class CountBean { V> a3V'
private String countType; |369@un6
int countId; df4^C->:
/** Creates a new instance of CountData */ _`@Xy!Ye
public CountBean() {} &lh_-@Xz
public void setCountType(String countTypes){ |:=b9kv
this.countType=countTypes; !|<f%UO
} *K jVPs
public void setCountId(int countIds){ pmW6~%}*
this.countId=countIds; t6bWSz0
} I0l.KiBm
public String getCountType(){ nhP~jJn
return countType; I"Q9W|J_&
} ;/";d]j
public int getCountId(){ /cL9?k;o
return countId; FJjF*2 .
} I6hhU;)C
} ;;y@z[ >
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CountCache.java i. u15$
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/* 4-M6C 5#.
* CountCache.java 8?j&{G
*
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* Created on 2007年1月1日, 下午5:01 +<!)k?
* @%G' U&R{
* To change this template, choose Tools | Options and locate the template under D2TXOPH
* the Source Creation and Management node. Right-click the template and choose hDB`t
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* Open. You can then make changes to the template in the Source Editor. 7:VEM;[d
*/ Xw*%3'
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package com.tot.count; !QQ<Ai!E
import java.util.*; g~Nij~/
/** 1FD7~S|
* ^C:{z)"h
* @author XgiI6-B~
*/ ^;)SFmjg%
public class CountCache { ]*g ss'N
public static LinkedList list=new LinkedList(); A|
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/** Creates a new instance of CountCache */ !8
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public CountCache() {} K{=r.W
public static void add(CountBean cb){ [I++>4
if(cb!=null){ 7dufY
} }
list.add(cb); iO?gF
} c+E//X|
} SrQ4y`?
} Y uw
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CountControl.java AF*ni~
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/* ~4=]%XYz
* CountThread.java ,<;l"v(
* K4?t' dd]
* Created on 2007年1月1日, 下午4:57 JO&;bT<
* 2\nBqCxR
* To change this template, choose Tools | Options and locate the template under uGP[l`f|FQ
* the Source Creation and Management node. Right-click the template and choose 9LqMQv"xW
* Open. You can then make changes to the template in the Source Editor. Ypn%[sSOp
*/ >tmnj/=&
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package com.tot.count; uHUvntr
import tot.db.DBUtils; fw:7Q7
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import java.sql.*; D y`W5_xSz
/** B7Ki@)
* ]|C_`,ux
* @author 1*! c
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*/ dr,B\.|jC
public class CountControl{ D% v:PYf
private static long lastExecuteTime=0;//上次更新时间 FhY{;-W(T
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]Efh(Gb]
/** Creates a new instance of CountThread */ %2@ Tj}xa
public CountControl() {} |z!q
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public synchronized void executeUpdate(){ Q
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Connection conn=null; wL8bs-
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PreparedStatement ps=null; (1kn):
try{ 'uP'P#
conn = DBUtils.getConnection(); (opROsFh
conn.setAutoCommit(false); .KiPNTh'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); B%%.@[o,
for(int i=0;i<CountCache.list.size();i++){ <?>I\
CountBean cb=(CountBean)CountCache.list.getFirst(); "%.|n|
CountCache.list.removeFirst(); Zzw}sZ?8
ps.setInt(1, cb.getCountId()); 5(iSOsb
ps.executeUpdate();⑴ IKMsY5i
//ps.addBatch();⑵ 36kc4=
} QoW(tM
//int [] counts = ps.executeBatch();⑶ dT0^-XSY
conn.commit(); vWqyZ-p,q
}catch(Exception e){ vI
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e.printStackTrace(); 3t"~F%4-}
} finally{ ~h>rskJ_
try{ hb /8Q
if(ps!=null) { h"VpQhi
ps.clearParameters(); dAYI D E
ps.close(); Dh\S`nfFq
ps=null; S\!
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} }|Hw0z P.
}catch(SQLException e){} 8Ehy9<
DBUtils.closeConnection(conn); G?Qe"4
.
} L?3VyBE
} l]a^"4L4`o
public long getLast(){ V9 +xL 1U#
return lastExecuteTime; =Q/w% 8G
} W; 3
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public void run(){ 1?D8|<
long now = System.currentTimeMillis(); "jl1.Ah
if ((now - lastExecuteTime) > executeSep) { {&\J)oZ
//System.out.print("lastExecuteTime:"+lastExecuteTime); @K,2mhE~h
//System.out.print(" now:"+now+"\n"); pTa'.m
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \b_-mnN"
lastExecuteTime=now; im_w+h%^
executeUpdate(); ^Ei*M0fF
} ~I8v5 H
else{ +?URVp
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); MAuM)8_P/|
} ppwd-^f3j
} w$DG=!
} ]yyU)V0Iu
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 c0!Te'?
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类写好了,下面是在JSP中如下调用。 /p"U
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<% RE ![O
CountBean cb=new CountBean(); Du)B9s
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); T$gkq>!j<E
CountCache.add(cb); KW&nDu