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: Or5?Gt
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CountBean.java ?eIb7O
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/* ,Y/B49
* CountData.java AU$~Ap*rsa
* [yXmnrxA
* Created on 2007年1月1日, 下午4:44 ^-_*@e*JE
* 1.cP3kl
* To change this template, choose Tools | Options and locate the template under sllT1%?
* the Source Creation and Management node. Right-click the template and choose "l56?@- x
* Open. You can then make changes to the template in the Source Editor. `N *:,8j
*/ A)&FcMO*z
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package com.tot.count; [Cl0Kw.LD
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/** 7y'":1
* H2s:M
* @author _J
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*/ 2!^=G=H/
public class CountBean { b_31 \
private String countType; *y*tI}
int countId; " CT}34l
/** Creates a new instance of CountData */ N-M.O:p
public CountBean() {} Tn}`VW~
public void setCountType(String countTypes){ 6h;(b2p{
this.countType=countTypes; 8)X9abC
} c* {6T}VZr
public void setCountId(int countIds){ DXiA4ihr=
this.countId=countIds; %bDxvaftT
} MxsLrWxm
public String getCountType(){ (F4e}hr&
return countType; xnY?<?J"!
} $Z@*!B^
public int getCountId(){ ?G,4N<]Nu
return countId; >!=@TK(~
} c@t?R$c
} Ga7E}y%
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CountCache.java |Kd#pYt%O
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/* 5*YoK)2J
* CountCache.java N(&{~*YE
* 7ftn
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* Created on 2007年1月1日, 下午5:01 QH/py
* TpKAdrY
* To change this template, choose Tools | Options and locate the template under uY&1[(Pb
* the Source Creation and Management node. Right-click the template and choose /f3/}x!po
* Open. You can then make changes to the template in the Source Editor. {@InOo!4w]
*/ KZppQ0
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package com.tot.count; C}8#yAS9M
import java.util.*; "\b>JV5
/** RQ,#TbAe
* D\Ak-$kJ^
* @author QL/KY G
*/ A[Mke
public class CountCache { t?GH
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public static LinkedList list=new LinkedList(); Z1
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/** Creates a new instance of CountCache */ u"v7shRp:
public CountCache() {} / FcRp ,"
public static void add(CountBean cb){ 9{u8fDm!
if(cb!=null){ jrib"Bh3,
list.add(cb); U#3N90,N=
} 9-42A7g^C
} F9r.DG$}
} }_D .Hy5
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CountControl.java (T%F^s5D
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/* o:d7IL
* CountThread.java ppAbG,7
* v)5;~.+%
* Created on 2007年1月1日, 下午4:57 "V|Rq]_+%
* V\L;EHtc$
* To change this template, choose Tools | Options and locate the template under is<:}z
* the Source Creation and Management node. Right-click the template and choose .vu7$~7
* Open. You can then make changes to the template in the Source Editor. \o>-L\`O
*/ C]ss'
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package com.tot.count; 2 2v"?*
import tot.db.DBUtils; V! Wy[u
import java.sql.*;
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/** $BwWQ?lp
* !nBbt?*
* @author c!Hz'W
*/ Bz]tKJ
public class CountControl{ )4g_S?l=
private static long lastExecuteTime=0;//上次更新时间 ^j<v~GTx+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 fd)8lK[KJ"
/** Creates a new instance of CountThread */ R]"Zv'M(AM
public CountControl() {} qed_ PsI
public synchronized void executeUpdate(){ 7
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Connection conn=null; (?qCtLZ
PreparedStatement ps=null; Sy8t2lk
try{ =3bk=vy
conn = DBUtils.getConnection(); ;8]HCC@:
conn.setAutoCommit(false); s%jBIeh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J
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for(int i=0;i<CountCache.list.size();i++){ iXWHI3
CountBean cb=(CountBean)CountCache.list.getFirst(); uKJ:)oyaCP
CountCache.list.removeFirst(); 4$Ai!a
ps.setInt(1, cb.getCountId()); B{Cm`f8E
ps.executeUpdate();⑴ SyL"Bmi
//ps.addBatch();⑵ DGTLlBkT
} cC*WZ]
//int [] counts = ps.executeBatch();⑶ 7P{= Pv+
conn.commit(); Id=20og
}catch(Exception e){ iJTG+gx
e.printStackTrace(); v`S5[{6
} finally{ Vl5r~+$|
try{ %KyZ15_(-L
if(ps!=null) { %xgP*%Sv2
ps.clearParameters(); .O-)m'5
ps.close(); 5Q10Ohh
ps=null; ZX_QnSNZ?
} a
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}catch(SQLException e){} } 9@rhW
DBUtils.closeConnection(conn); ^%\a,~
} ,+i^]yF3j
} nDrRK
public long getLast(){ RZz?_1'
return lastExecuteTime; Il=6t
} 2"6L\8hd2
public void run(){ >{^_]phlb
long now = System.currentTimeMillis(); !.R-|<2|6
if ((now - lastExecuteTime) > executeSep) { neEqw+#Z
//System.out.print("lastExecuteTime:"+lastExecuteTime); BValU
//System.out.print(" now:"+now+"\n"); (
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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lastExecuteTime=now; x.1=QF{!
executeUpdate(); =]@Bc
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} Zr}>>aIJ]k
else{ amsl>wc!
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 11PL1zzH
} 1RkN^FZOxq
} Trirb'qO
} m-{DhJV
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 NZGO8u
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类写好了,下面是在JSP中如下调用。 R&uPoY,f
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<% /qQx~doK
CountBean cb=new CountBean(); |6AR!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ic G 9x
CountCache.add(cb); P}6#s'07~
out.print(CountCache.list.size()+"<br>"); Dk\%,[4(
CountControl c=new CountControl(); IQBL;=.J.
c.run(); :lu!%p<$
out.print(CountCache.list.size()+"<br>"); 4f j}d.?
%>