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: HG /fp<[
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CountBean.java
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/* st??CX2
* CountData.java NEIF1(:
* @=G[mc\
* Created on 2007年1月1日, 下午4:44 (<B%Gy@
* )z&C&Gqz
* To change this template, choose Tools | Options and locate the template under $@s-OQ}
* the Source Creation and Management node. Right-click the template and choose WCY._H>|
* Open. You can then make changes to the template in the Source Editor. 0v EQgx>
*/ qbQdxKk
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package com.tot.count; a{ke%W$*P
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/** ADF<5#I
* Wlg 1t~1=
* @author zvGncjMkC
*/ #e =E
public class CountBean { F,as>X#
private String countType; cGs&Kn;h
int countId; PE;<0Cz\
/** Creates a new instance of CountData */ _x|R`1`
public CountBean() {} >'#vC]@
public void setCountType(String countTypes){ P#3J@aRC
this.countType=countTypes; kXdXyq
} ,f%4xXI
public void setCountId(int countIds){ d_ :f-
this.countId=countIds; @r<2]RXlc
} KtJc9dnX
public String getCountType(){ jHob{3
return countType; Mi
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} ouyZh0G
public int getCountId(){ y%9Hu
return countId; .5>]DZn6
} )" Z|x
} ^7Z?}tgU
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CountCache.java TPx`qyW
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/* cSv;HN:
* CountCache.java E3{kH
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* Vug[q=i
* Created on 2007年1月1日, 下午5:01 'I}wN5`
* H`k
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* To change this template, choose Tools | Options and locate the template under v6wg,,T
* the Source Creation and Management node. Right-click the template and choose ,Y|
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* Open. You can then make changes to the template in the Source Editor. -1hCi!
*/ _J2?B?S/j
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package com.tot.count; +t-_FbFh3D
import java.util.*; %jx<<hW
/** ci+ajON
* >`[+24e
* @author &*8.%qe;
*/ $mf O:%
public class CountCache { g0QYBrp
public static LinkedList list=new LinkedList(); H>D?
/** Creates a new instance of CountCache */ FQ0 ;%Z
public CountCache() {} d~6UJ=]@8
public static void add(CountBean cb){ N/#x
if(cb!=null){ "5ISKuL
list.add(cb); `wIWK7i
} C2b<is=H:
} a".iVf6y
} zRgGSxn
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CountControl.java :_F 8O
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/* F_ -Xx"
* CountThread.java 1Ke9H!_P
* dEI!r1~n
* Created on 2007年1月1日, 下午4:57 [_ uT+q3
* yK"HHdYTV
* To change this template, choose Tools | Options and locate the template under "9X!Ewm"P
* the Source Creation and Management node. Right-click the template and choose vqVwo\oEdU
* Open. You can then make changes to the template in the Source Editor. Kv:.bHN}
*/ pI.8Ip_r
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package com.tot.count; .qf~t/o
import tot.db.DBUtils; :)4c_51 `
import java.sql.*; Z:<wB#G
/** n``9H91
* #RyTa
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* @author )Pc>+}D
*/ 2[1t
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public class CountControl{ ]
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private static long lastExecuteTime=0;//上次更新时间 u^Ktz
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 WAtv4
/** Creates a new instance of CountThread */ p<mBC2!%
public CountControl() {} {wk#n.c
public synchronized void executeUpdate(){ owyQFk
Connection conn=null; lqO>Q1_{K
PreparedStatement ps=null; A@Zqh<,Ud
try{ M+j*5wNy
conn = DBUtils.getConnection(); 8N |K
conn.setAutoCommit(false); G pO*As_2
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); FI$
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for(int i=0;i<CountCache.list.size();i++){ B\aVE|~PB
CountBean cb=(CountBean)CountCache.list.getFirst(); P;K3T![
CountCache.list.removeFirst(); ={]POL\ A
ps.setInt(1, cb.getCountId()); ~e)"!r
ps.executeUpdate();⑴ Y]`o-dV
//ps.addBatch();⑵ 7+KI9u}-
} Yne1MBK
//int [] counts = ps.executeBatch();⑶ ~gQYgv<7
conn.commit(); VV54$a
}catch(Exception e){ 9pr.`w
e.printStackTrace(); f;OB"p
} finally{ /<-=1XJI
try{ zK_P3rLsS
if(ps!=null) { ,_<|e\>~
ps.clearParameters(); X(.[rC>
ps.close(); .r-Zz3
ps=null; c/j+aj0.v
} Eg}U.ss^
}catch(SQLException e){} @w(|d<5l:L
DBUtils.closeConnection(conn); 1*6xFn
} 9&6P,ts%Q
} wZJbI[r
public long getLast(){ k=d0%}
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return lastExecuteTime; %\}5u[V
} AOwmPHEL
public void run(){ IAN={";p
long now = System.currentTimeMillis(); ([^f1;ncm
if ((now - lastExecuteTime) > executeSep) { gLFTnMO
//System.out.print("lastExecuteTime:"+lastExecuteTime); JvP>[vb
//System.out.print(" now:"+now+"\n"); <R~;|&o,$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #W.vX=/*
lastExecuteTime=now; paMK]-
executeUpdate(); rz`"$g+#
} Lm<WT*@
else{ x&+&)d
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); D
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} *XYp~b
} ?1O`
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} E="uDHw+
//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 EDh-pK
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类写好了,下面是在JSP中如下调用。 LCzeE7x
%.'oY%
<% `ueOb
CountBean cb=new CountBean(); ]Wjcr2Wq
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); tJ8:S@E3,
CountCache.add(cb); ,!PV0(F(
out.print(CountCache.list.size()+"<br>"); B&1E&Cv_8
CountControl c=new CountControl(); f#7=N{wm
c.run(); Lp4F1H2t-
out.print(CountCache.list.size()+"<br>"); p8?"}
%>