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: QwNly4
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CountBean.java _X^1IaL
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/* Q8:Has
* CountData.java !o5
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* 4x{0iav
* Created on 2007年1月1日, 下午4:44 ~bM4[*Q7
* oRm L
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* To change this template, choose Tools | Options and locate the template under 0LPig[
* the Source Creation and Management node. Right-click the template and choose 3QV *%
* Open. You can then make changes to the template in the Source Editor. v~f HYa>
*/ A;;fACF8e
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package com.tot.count; _Zp}?b5Q
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/** 1t:Q_j0Ym
* ;kFDMuuO
* @author bZnuNYty75
*/ ^nT/i
.#_
public class CountBean { e}D3d=6`
private String countType; S@jQX
int countId; dbwe?ksh
/** Creates a new instance of CountData */ :8L8q<U
public CountBean() {} <6EeD5{*
public void setCountType(String countTypes){ :By?O"LQ
this.countType=countTypes; ~+Rc}K
} R+2+-j4
public void setCountId(int countIds){ fV &KM*W*@
this.countId=countIds; *"+=K,#D
} v6=RY<l"m
public String getCountType(){ RHaI ~jb
return countType; _D+}q_
} Nh8Q b/::
public int getCountId(){ NTdixfR
return countId; ]mo-rhDsM
} eK6hS_E
} Fz3fwLawI
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CountCache.java Qiua
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/* 3VsW@SG7N
* CountCache.java %zA;+s$l
* q
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* Created on 2007年1月1日, 下午5:01 sNj)ZWgd>
* 3*]eigi)
* To change this template, choose Tools | Options and locate the template under *S]Ci\{_
* the Source Creation and Management node. Right-click the template and choose 4iqoR$3Fc
* Open. You can then make changes to the template in the Source Editor. LIS)(X<]?
*/ 9 %8"e>~
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package com.tot.count; na#CpS;pc
import java.util.*; E=jNi
/** 8qY79)vD4E
* -9%:ilX~
* @author >z/#_z@LV
*/ LM$W*
public class CountCache { I(]}XZq
public static LinkedList list=new LinkedList(); 98j>1"8
/** Creates a new instance of CountCache */ ~T ]m>A!
public CountCache() {} 88VZR&v
public static void add(CountBean cb){ O,J>/
if(cb!=null){ 8J=?5
list.add(cb); aDq5C-MzG
} y[`l3;u:'
} _a5d?Q9Z
} )jU)_To
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CountControl.java 52SaKA[
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/* a;rdQ>
* CountThread.java @>d*H75
*
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* Created on 2007年1月1日, 下午4:57 |2?'9<
* EqyeJq .
* To change this template, choose Tools | Options and locate the template under K-e9>fmB#
* the Source Creation and Management node. Right-click the template and choose sc|_Q/`\.
* Open. You can then make changes to the template in the Source Editor. o]+z)5zC
*/ 3[\iQ*d }B
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package com.tot.count; )hd@S9Z.Y
import tot.db.DBUtils; +vYoB$!
import java.sql.*; e&simX;W
/** *v;!-F&8>
* c]$i\i#
* @author qHsUP;7
*/ 1LqoF{S:
public class CountControl{ !,l9@eJQ
private static long lastExecuteTime=0;//上次更新时间 m#8m] Y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 c|lu&}BS
/** Creates a new instance of CountThread */ @x9a?L.48
public CountControl() {} 0Oi,#]F
public synchronized void executeUpdate(){ P7J>+cm
Connection conn=null; {FO;Yg'
PreparedStatement ps=null; E'v_#FLvR
try{ {s)+R[?m<o
conn = DBUtils.getConnection(); q`|LRz&al
conn.setAutoCommit(false); p`mS[bxv!
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ~3UQ|j
for(int i=0;i<CountCache.list.size();i++){ {p)",)td
CountBean cb=(CountBean)CountCache.list.getFirst(); &J55P]7w
CountCache.list.removeFirst(); R?v>Q` Qi
ps.setInt(1, cb.getCountId()); g3Ec"_>P
ps.executeUpdate();⑴ aHs^tPg
//ps.addBatch();⑵ {n(b{ibl
} ;6gDV`Twy
//int [] counts = ps.executeBatch();⑶ w<C#Bka
conn.commit(); h"Xg;(K
}catch(Exception e){ W@ T~ly;e*
e.printStackTrace(); 9!f/aI
} finally{ uG?_< mun
try{ QBtnx[
if(ps!=null) { l=]cy-H
ps.clearParameters(); aY3^C q(r
ps.close(); v$~QU{&
ps=null; ?;KKw*
} lwHzj&/ ~
}catch(SQLException e){} +)k b(
DBUtils.closeConnection(conn); UUSq$~Ct
} _ 6O\W%it
} bnm
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public long getLast(){ k xP-,MD
return lastExecuteTime; ^cV;~&|.Xk
} $>*3/H
public void run(){ if}-_E<F
long now = System.currentTimeMillis(); wkP#Z"A0~
if ((now - lastExecuteTime) > executeSep) { (2$(
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//System.out.print("lastExecuteTime:"+lastExecuteTime); >QA uEM
//System.out.print(" now:"+now+"\n"); aki_RG>U'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); HKF H/eV
lastExecuteTime=now; (]b!{kS
executeUpdate(); =fu
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} w<zIAQN
else{ Ks=>K(V6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Z&ZP"P4
} =NOH:#iQ
} [OHxonU
} i\1TOP|h
//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 T~QWRBO
TS /.`.gT
类写好了,下面是在JSP中如下调用。 P6!jRC"52'
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<% &L#UGp$,
CountBean cb=new CountBean(); z."a.>fPaO
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 9U{a{~b
CountCache.add(cb); ki [UV
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out.print(CountCache.list.size()+"<br>"); %T X@I$Ba
CountControl c=new CountControl(); g$HwxA9Gp/
c.run(); .}'qUPNR
out.print(CountCache.list.size()+"<br>"); @b"t]#V(E
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