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: U.HeIJ#
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CountBean.java Iz<}>J B
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/* {`vv-[j|
* CountData.java @ \(*pa
* 3<nd;@:-
* Created on 2007年1月1日, 下午4:44 b:uMON,H
* %XieKL
* To change this template, choose Tools | Options and locate the template under Cp2$I<T
* the Source Creation and Management node. Right-click the template and choose 'rwnAr
* Open. You can then make changes to the template in the Source Editor. P9aGDma
*/ `:XrpD
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package com.tot.count; )q48cQ
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/** E%vG#
* mw1|>*X&R
* @author Wl:vO^
*/ P]4C/UDS-~
public class CountBean { ,nELWzz%{
private String countType; cDS6RO?
int countId; "3"9sIZ(
/** Creates a new instance of CountData */ Jn_; cN
public CountBean() {} QDg\GA8|
public void setCountType(String countTypes){ $6a55~h|(
this.countType=countTypes; p9[J9D3~
}
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public void setCountId(int countIds){ 7Xu.z9y
this.countId=countIds; )kSE5|:pi
} IZV D.1
public String getCountType(){ Vb`m3
return countType; A3C#wJ
} `4&
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public int getCountId(){ m
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return countId; #
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} fCL5Et
} i6p0(OS&D
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CountCache.java 'G!w0yF
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/* *5bKJgwJ
* CountCache.java C%8jWc
* );*A$C9RA
* Created on 2007年1月1日, 下午5:01 8kz7*AO
* x(nWyVB
* To change this template, choose Tools | Options and locate the template under .R/`Y)4
* the Source Creation and Management node. Right-click the template and choose ,[rh7_
* Open. You can then make changes to the template in the Source Editor. YPraf$
*/ *%^Vq
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package com.tot.count; yp=(wcJ
import java.util.*; Nb2]}; O
/**
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* S.bB.<
* @author >z*2Og#1
*/ Zs
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public class CountCache { K4Mv\! Q<8
public static LinkedList list=new LinkedList(); 8-Ik .,}
/** Creates a new instance of CountCache */ 1/>#L6VAZ
public CountCache() {} !JtVp&?
public static void add(CountBean cb){ fHek!Jv.
if(cb!=null){ ^Jb=&u$
list.add(cb); hm=E~wv'L
} i?uJ<BdU[
} tH0=ysf
} `wt*7~'=
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CountControl.java &u-H/CU%
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/* L0?-W%$>
* CountThread.java JTw\5j
* yk1syN_
* Created on 2007年1月1日, 下午4:57 ZzA4iT=KO
* !BD+H/A.{
* To change this template, choose Tools | Options and locate the template under }~Z1C0t
* the Source Creation and Management node. Right-click the template and choose |A".Mo_5
* Open. You can then make changes to the template in the Source Editor. iX0s4
*/ (,~gY=E+
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package com.tot.count; |7Z7_YWs
import tot.db.DBUtils; nd(O;XBI
import java.sql.*; CN6@g^)P
/** J,ZvaF
* ~GJJ{Bm_
* @author SsiKuoxk
*/ ,6Ulj+l
public class CountControl{ #gbJ$1s
private static long lastExecuteTime=0;//上次更新时间 ]J\tosTi
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +qsNz*@p"
/** Creates a new instance of CountThread */ e*w2u<HP
public CountControl() {} :d7Ju.*J
public synchronized void executeUpdate(){ 6]#pPk8[Z
Connection conn=null; .b*%c?e
PreparedStatement ps=null; zoYw[YP 9
try{ M&Aeh8>uX
conn = DBUtils.getConnection(); `!<RP'
conn.setAutoCommit(false); JiL%1y9|
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); %;+Q0
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for(int i=0;i<CountCache.list.size();i++){ 1Wzm51RU
CountBean cb=(CountBean)CountCache.list.getFirst(); )0Av:eF-+
CountCache.list.removeFirst(); ;`IZ&m$
ps.setInt(1, cb.getCountId()); #w3cImgp2
ps.executeUpdate();⑴ _MfXN$I?}
//ps.addBatch();⑵ ?k)(~Y&@p
} ;E0Xn-o_
//int [] counts = ps.executeBatch();⑶ 9$F '*{8
conn.commit(); ^Wk.D-
}catch(Exception e){ C.M]~"e
e.printStackTrace(); )*_4=-8H
} finally{ KF&1Y>t=
try{ |` gSkv
if(ps!=null) { tkrRdCq
ps.clearParameters(); V$O{s~@ti
ps.close(); Q$_S/d%*
ps=null; w.kb/
} W#1t%hT$
}catch(SQLException e){} wmu#@Hf/[h
DBUtils.closeConnection(conn); {bB;TO<b`
} alM
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} (~t/8!7N
public long getLast(){ xB=~3
return lastExecuteTime; _\M:h+^
} F6 ?4E"d
public void run(){ > D:(HWL
long now = System.currentTimeMillis(); >P*wK9|(
if ((now - lastExecuteTime) > executeSep) { {VOLUC o 4
//System.out.print("lastExecuteTime:"+lastExecuteTime); qH(3Z^ #.|
//System.out.print(" now:"+now+"\n"); >*v!2=
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !o
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lastExecuteTime=now; 6\4~&+;wL
executeUpdate(); 9L+dN%C
} &sJZSrk|
else{ fg1_D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0&!,+
} ~5e)h_y
} /DPD,bA
} &HdzbKO=
//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 #kD8U#
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类写好了,下面是在JSP中如下调用。 5v:c@n
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<% lFMQT
;
CountBean cb=new CountBean(); RtZK2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); md8r"
CountCache.add(cb); P[NAO>&t