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: |r}%AN6+
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CountBean.java bQXxb(^
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/* C$*`c6R
* CountData.java [7<X&Q
* zmr=iK
* Created on 2007年1月1日, 下午4:44 wrqdQ}@(
* &@dMk4BH<
* To change this template, choose Tools | Options and locate the template under ,Lv}Xku
* the Source Creation and Management node. Right-click the template and choose W:(:hT6`j9
* Open. You can then make changes to the template in the Source Editor. MF 5w.@62X
*/ v^@L?{"}8
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package com.tot.count; YD.3FTNGC
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/** h4?+/jk7
* f@LUp^Z/v
* @author EyBdL
*/ 15yIPv+5
public class CountBean { u:HKmP;
private String countType; Xid>8
int countId; }S#.Pw%
/** Creates a new instance of CountData */ `}zv17wp
public CountBean() {} Jk{>*jYk`
public void setCountType(String countTypes){ 3BY/&'oX
this.countType=countTypes; q/;mxq$
} Lj~lfO
public void setCountId(int countIds){ C{!Czz.N
this.countId=countIds; *D AgcB
} ]VwAHT&je
public String getCountType(){ u`bWn
return countType; n:*+pL;
} 7y[B[$P
public int getCountId(){ _Fz)2h,3
return countId; Ku&(+e
} ,1~Zqprn
} //J:p,AF
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CountCache.java `4k;`a
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/* V ?_%Y<|L
* CountCache.java 6,@M0CX
* G!rcY5!J
* Created on 2007年1月1日, 下午5:01 'h81\SKFK9
* >hQR
* To change this template, choose Tools | Options and locate the template under +vU.#C_2
* the Source Creation and Management node. Right-click the template and choose 3M@>kIT8
* Open. You can then make changes to the template in the Source Editor. +uT=Wb \
*/ aLsGden|
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package com.tot.count; ^k_!+8"q{
import java.util.*; k&~vVx
/** R
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* 4k#B5^iJ
* @author %1=W#jz
*/ 2X*epU_1h
public class CountCache { yBl<E$=
public static LinkedList list=new LinkedList(); 8vT:icl
/** Creates a new instance of CountCache */ 2sU"p5 j
public CountCache() {} }s)Z:6;(,q
public static void add(CountBean cb){ 92SB'T>
if(cb!=null){ PH7L#H^
list.add(cb); gIRCJ=e[b
} S;t~"87v*
} +?.,pq n<=
} F;b|A`M
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CountControl.java $<aBawLZO
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/* =?f}h{8x>
* CountThread.java ,h>w %
* {[s<\<~B*
* Created on 2007年1月1日, 下午4:57 cYp}$
* Z
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* To change this template, choose Tools | Options and locate the template under V`H#|8\i
* the Source Creation and Management node. Right-click the template and choose {$EXI]f
* Open. You can then make changes to the template in the Source Editor. I}q-J~s
*/ G`
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package com.tot.count; !e7vc[N
import tot.db.DBUtils; )a}5\V
import java.sql.*; JJ+<?CeHD
/** [-CG&l2?L
* I#Bz
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* @author g@U#Y#b@"
*/ (8*lLZ
public class CountControl{ `j(+Y
private static long lastExecuteTime=0;//上次更新时间 <N*>9S,}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 asF-mf;D
/** Creates a new instance of CountThread */ */\.-L{h
public CountControl() {} 869`jA&7"
public synchronized void executeUpdate(){ e7qT;
Connection conn=null; t/$xzsoJZr
PreparedStatement ps=null; iY($O/G[+
try{ y H'\<bT
conn = DBUtils.getConnection(); ]SPB c
conn.setAutoCommit(false); nY8UJy}<oL
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J~}UG]j n
for(int i=0;i<CountCache.list.size();i++){ OP&[5X+Y
CountBean cb=(CountBean)CountCache.list.getFirst(); 6,7omYof
CountCache.list.removeFirst(); o2|(0uN'
ps.setInt(1, cb.getCountId()); MvW>ktkU
ps.executeUpdate();⑴ +sI.GWQ_:
//ps.addBatch();⑵ a(7ryl~c=
} xC{NIOYn'
//int [] counts = ps.executeBatch();⑶ ~3%3{aa
conn.commit(); U\
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}catch(Exception e){ Z\L@5.*ydE
e.printStackTrace(); _qg6(
X
} finally{ %b?Pasf.
try{ LBE".+
if(ps!=null) { k|_2aQ02
ps.clearParameters(); "4`%NA
ps.close(); <oO,CXF
ps=null; G<z)Ydh_
} C1/jA>XW
}catch(SQLException e){} ;FmSL#]I
DBUtils.closeConnection(conn); wY95|QS
} d"78:+
} 47 RY pd
public long getLast(){ q>[% C5
return lastExecuteTime; Qx6/QaS?
} {eXYl[7n
public void run(){ J
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long now = System.currentTimeMillis(); Lm?*p>\Q
if ((now - lastExecuteTime) > executeSep) { G4}q*&:k
//System.out.print("lastExecuteTime:"+lastExecuteTime); wgyO%
//System.out.print(" now:"+now+"\n"); V4-=Ni]k
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ]R@G5d
lastExecuteTime=now; TH|hrL;:8
executeUpdate(); e!yw"Cf*
} [1*/lt|+p
else{ -1:Z^&e/
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); .#@D n(
} m\f_u*
} (*ng$zZ$
} nADd,|xD3
//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 /ZDc=>)~
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类写好了,下面是在JSP中如下调用。
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<% X W)A~wPBs
CountBean cb=new CountBean(); =5`@:!t7
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ~Hs{(7
CountCache.add(cb); !_) ^bRd
out.print(CountCache.list.size()+"<br>"); _p&$X
CountControl c=new CountControl(); w#T,g9
c.run(); 62jA
out.print(CountCache.list.size()+"<br>"); wDO5Zew!
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