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: R'kyrEO
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CountBean.java jp $Z]
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/* Bo<>e~6P
* CountData.java 2o>)7^9|#<
* )tCX
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* Created on 2007年1月1日, 下午4:44 jV(6>BAI_
* }g$(+1g
* To change this template, choose Tools | Options and locate the template under ,K:ll4{b
* the Source Creation and Management node. Right-click the template and choose gN)c
* Open. You can then make changes to the template in the Source Editor. 8/0Y vh
*/ c/_+o;Bc
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package com.tot.count; GTHkY*
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/** rDm'Z>nTf
* jy]JiQB
* @author `DT3x{}_S
*/ 8k(P,o
public class CountBean { 7}*6#KRG
private String countType; 6U^\{<h_c
int countId; qF 9NQ;
/** Creates a new instance of CountData */ k</%YKk
public CountBean() {} s?ko?qN(
public void setCountType(String countTypes){ $T :un.TM
this.countType=countTypes; g;ZxvR)ZJk
} ICAH G7 ,
public void setCountId(int countIds){ Me6+~"am/
this.countId=countIds; lN9=TxH1(;
} c)@>zto#
public String getCountType(){ c5|:,wkx
return countType; 0\2\*I}?
} K\vSB~{[
public int getCountId(){ ['%69dPh
return countId; xoOJauSX1
}
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} rHP%0f9:
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CountCache.java _-5,zPR
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/*
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* CountCache.java RxMH!^
* ORu2V#Z[
* Created on 2007年1月1日, 下午5:01 -{`@=U
* |Yq$sU
* To change this template, choose Tools | Options and locate the template under c{[q>@y
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* the Source Creation and Management node. Right-click the template and choose A>{p2?`+!
* Open. You can then make changes to the template in the Source Editor. o!4!"O'E
*/ (%O@r!{
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package com.tot.count; gIA@l`"
import java.util.*; sBV4)xM
/** 1Z{ZV.!
* lC=~$c:
* @author ;(}V"i7Hu
*/ 5wUUx#
public class CountCache { ?8W("W
public static LinkedList list=new LinkedList(); g#]wLm#
/** Creates a new instance of CountCache */ @y31NH(
public CountCache() {} waKT{5k
public static void add(CountBean cb){ $ "Bh]-
if(cb!=null){ pHoEa7:
list.add(cb); 4nAa`(62
} 7} jWBK
} !ZU2{
} c$wsH25KH8
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CountControl.java h[Gg}N!
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/* Ew3ibXD
* CountThread.java 8BvonYt=8
* M`6y@<
* Created on 2007年1月1日, 下午4:57 u !!X6<
* :UJ a&$)
* To change this template, choose Tools | Options and locate the template under wCk~CkC?
* the Source Creation and Management node. Right-click the template and choose ki>~H!zB
* Open. You can then make changes to the template in the Source Editor. #2iD'>bQ
*/ wp7!>%s{
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package com.tot.count; V]EtwA
import tot.db.DBUtils; 5s?Hxn
import java.sql.*; _{jjgQJ5
/** "`asFg
* 1He{v#
* @author @AYRiOodi
*/ J~(Wf%jM~
public class CountControl{ 7^T^($+6s&
private static long lastExecuteTime=0;//上次更新时间 zS]8V?`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mw5?[@G-
/** Creates a new instance of CountThread */ WL{(Ob
public CountControl() {} US
public synchronized void executeUpdate(){ CkswJ:z)sc
Connection conn=null; .G o{1[
PreparedStatement ps=null; F7")]q3I~
try{ ;O<9|?
conn = DBUtils.getConnection(); pStk/te,XK
conn.setAutoCommit(false); "`[!L z
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); tTU=+*Io
for(int i=0;i<CountCache.list.size();i++){ P9T5L<5
CountBean cb=(CountBean)CountCache.list.getFirst(); .Yw'oYnS
CountCache.list.removeFirst(); F ]O$(7*
ps.setInt(1, cb.getCountId()); Su 5>$
ps.executeUpdate();⑴ Pl-5ncb\
//ps.addBatch();⑵ )J?{+3
} 0kDK~iT
//int [] counts = ps.executeBatch();⑶ -7!&@wuQ
conn.commit(); #Km:}=
}catch(Exception e){ {647|j;e
e.printStackTrace(); &F}"Z(B<wK
} finally{ ^uJU}v:
try{ k=GG>]<i
if(ps!=null) { 9Ct`
ps.clearParameters(); ud fe
ps.close(); Tlj:%yK2
ps=null; fm~kM
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} KN"S?i]X
}catch(SQLException e){} T;L>P[hNn
DBUtils.closeConnection(conn); hm<}p&!J
} N8`?t5
} Z0De!?ALV\
public long getLast(){ 2DD:~Tbi
return lastExecuteTime; 7 h y&-<
}
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public void run(){ fSDi-I
long now = System.currentTimeMillis(); ~:km]?lz0
if ((now - lastExecuteTime) > executeSep) { SE7W F18A
//System.out.print("lastExecuteTime:"+lastExecuteTime); ASPy
//System.out.print(" now:"+now+"\n"); h d~$WV0#
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); wv^rS^~
lastExecuteTime=now; lnGq :-
executeUpdate(); jPnM>=
}
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else{ )bx_;9Y{
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); RllY-JBO
} ;WL1B
} 6WoAs)ZF
} 7*DMVok:
//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 20rkKFk*
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类写好了,下面是在JSP中如下调用。 |#l=
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<% )6~1 ^tD
CountBean cb=new CountBean(); ?[x49Ux,P
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {K#NB_*To
CountCache.add(cb); 0ult7s}
out.print(CountCache.list.size()+"<br>"); /J)l /oI
CountControl c=new CountControl(); Jw~( G9G
c.run(); ``ekR6[ 8c
out.print(CountCache.list.size()+"<br>"); *Ywpz^2?:
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