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: 7(8i~}
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CountBean.java pJg'$iR!/
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/* X283 . ?
* CountData.java seQSDCsvw*
* ig-V^P
* Created on 2007年1月1日, 下午4:44 /z=xEnU#
* cd&^ vQL8
* To change this template, choose Tools | Options and locate the template under CBkI!
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* the Source Creation and Management node. Right-click the template and choose ?"hrCEHV{9
* Open. You can then make changes to the template in the Source Editor. ;+-@AYl
*/ EO.Se9ux
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package com.tot.count; ]n \Qa
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/** 7lLh4__;`6
* yr;~M{{4
* @author x]6-r`O7r
*/ |2L|Zp&
public class CountBean { s0zN#'o]
private String countType; Ee~<PDzB
int countId; Jn|sS(Q}
/** Creates a new instance of CountData */ %#_"Ie
public CountBean() {} GgU8f0I
public void setCountType(String countTypes){ XBr-UjQ
this.countType=countTypes; I ~U1vtgp
} "_f~8f`y
public void setCountId(int countIds){ &b__/o
this.countId=countIds; thU9s%,
} Hto RN^9
public String getCountType(){ iH`Q4
return countType; I>bO<T`
} 2\4ammwT
public int getCountId(){ cD%_+@GaU
return countId; u# TNW.
} yjF;%A/0
} 2@Nt6r
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CountCache.java yv;KKQ
@%^JB
/* cj64.C
* CountCache.java `MLOf
* M1mx {<]A
* Created on 2007年1月1日, 下午5:01 \PzJ66DL!
* w=QlQ\
* To change this template, choose Tools | Options and locate the template under /g`!Zn8a
* the Source Creation and Management node. Right-click the template and choose mf W}^mu
* Open. You can then make changes to the template in the Source Editor. R9&3QRW|
*/ ZLGglT'EW>
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package com.tot.count; 3|0wD:Dy
import java.util.*; $eq*@5B
/** /ucS*m:<x
* u*S-Pji,x
* @author U [R[VY7
*/ p9y@5z
public class CountCache { #iiXJnG
public static LinkedList list=new LinkedList(); j[RY
/** Creates a new instance of CountCache */ ?onEqH>
public CountCache() {} rj
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public static void add(CountBean cb){ J*Q+$Ai~
if(cb!=null){ |muZv!,E
list.add(cb); T!jMh-8
} <\'aUfF v
} fq[1 |Q
} ] :SbvsPm
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CountControl.java /8? u2
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/* 96d&vm~m1
* CountThread.java Djr/!j
* 7PW7&]-WQ
* Created on 2007年1月1日, 下午4:57 8~}~d}wW
* zN&m-nrw
* To change this template, choose Tools | Options and locate the template under re xMS
* the Source Creation and Management node. Right-click the template and choose j0~dJ#
* Open. You can then make changes to the template in the Source Editor. 8xb({e4
*/ ^4~?]5Y\
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package com.tot.count; iOB*K)U1
import tot.db.DBUtils; 9 >"}||))
import java.sql.*; HoO1_{q"
/** *AG01# ZF
* !DkIM}.
* @author %%T?LRv
*/ Vz]yJ:
public class CountControl{ "H\R*\-0
private static long lastExecuteTime=0;//上次更新时间 H-qbgd6&>R
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9yK\<6}}QH
/** Creates a new instance of CountThread */ ;3\'}2^|l
public CountControl() {} 8
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public synchronized void executeUpdate(){ {yFMY?6rf
Connection conn=null; +TC##}Zmb
PreparedStatement ps=null; 9hei8L:
try{ qV)hCc/ ~
conn = DBUtils.getConnection(); tI<6TE'!p#
conn.setAutoCommit(false); :0kKw=p1R
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); "#8I &xZK
for(int i=0;i<CountCache.list.size();i++){ 2i$_ ,[fi
CountBean cb=(CountBean)CountCache.list.getFirst(); (7C$'T-ZK
CountCache.list.removeFirst(); ujLje:Yc
ps.setInt(1, cb.getCountId()); +fN2%aC
ps.executeUpdate();⑴ f{-,"6Y1
//ps.addBatch();⑵ _LFABG=
} K?u:-QX^
//int [] counts = ps.executeBatch();⑶ ETm:KbS
conn.commit(); ao"Z%#Jb~
}catch(Exception e){ (@NW2
e.printStackTrace(); t9r
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} finally{ T>irW(
try{ ?L"x>$
if(ps!=null) { e>Dux
ps.clearParameters(); /jSb^1\
ps.close(); J4Ca0Ag
ps=null; }_D{|!!!T
} N}Or+:"O:q
}catch(SQLException e){} epI~w
DBUtils.closeConnection(conn); \Rw^&;\1
} l%qfaU2
} DAy|'%rF1-
public long getLast(){ D7Y?$=0ycb
return lastExecuteTime; >#y1(\e
} X([@}ren
public void run(){ 2RdpVNx\y
long now = System.currentTimeMillis(); s
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if ((now - lastExecuteTime) > executeSep) { ]}pAZd
//System.out.print("lastExecuteTime:"+lastExecuteTime); SduUXHk
//System.out.print(" now:"+now+"\n"); ypNeTR$4
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); w+{{4<+cd
lastExecuteTime=now; ,=2)1I]
executeUpdate(); Jw^h<z/Ux
} }tJMnq/m($
else{ x[R?hS,0t
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); E O "
} X{iidTW`xv
} ]UrlFiR
} knzQ)iv&&
//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 iZ0.rcQj'o
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类写好了,下面是在JSP中如下调用。 &zPM#Q
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<% d>/4z#R}-
CountBean cb=new CountBean(); +!t *LSF
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ltHuN;C\
CountCache.add(cb); h1#l12k^'
out.print(CountCache.list.size()+"<br>"); JEfhr
CountControl c=new CountControl(); [-\DC*6
c.run(); :I^4ILQCD
out.print(CountCache.list.size()+"<br>"); #+^l3hMK
%>