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: +i HZ*
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CountBean.java 33IJbg
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/* Jh`Pq,B:
* CountData.java W6%\Zwav?)
* ur7sf$
* Created on 2007年1月1日, 下午4:44 "*UN\VV+s
* g?&_5)&
* To change this template, choose Tools | Options and locate the template under 1?%Q"*Y&
* the Source Creation and Management node. Right-click the template and choose ;n]GHqzY_
* Open. You can then make changes to the template in the Source Editor. :59fb"^$
*/ ;\-f7!s
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package com.tot.count; Bu7Ztt*
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/** @D1}).
* pn"TFapJA
* @author PIOG|E
*/ %EV\nwn6
public class CountBean { \vwsRT 1
private String countType; 5^lFksZ
int countId; t~_vzG
/** Creates a new instance of CountData */ ggn C #$
public CountBean() {} >1uo5,wrF
public void setCountType(String countTypes){ 9bu}@#4*
this.countType=countTypes; XK#~w:/fB
}
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public void setCountId(int countIds){ q9+`pj
this.countId=countIds; X%JQ_Z
} 3<F\5|
public String getCountType(){ .Z?@;2<l
return countType; T<XGG_NOl
} 8k[=$Ro
public int getCountId(){ p6S{OUiG
return countId; |y%pJdPk=
} W3Gg<!*Uo
} zy8Z68%E`*
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CountCache.java E3hql3=
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/* &k53*Wo
* CountCache.java Bk)E]Fk|
* }SD*@w
* Created on 2007年1月1日, 下午5:01 }Br=eaY
* hSkI]%
* To change this template, choose Tools | Options and locate the template under lQ&"p+n
* the Source Creation and Management node. Right-click the template and choose G42J
* Open. You can then make changes to the template in the Source Editor. B8Vhl:p
*/ )WWqi,T}
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package com.tot.count; _"0,
import java.util.*; KYw~(+gHv2
/** 0c}pg:XT
* g}@W9'!
* @author TwfQq`
*/ !V.2~V[^M
public class CountCache { bqPaXH
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public static LinkedList list=new LinkedList(); lK VV*RR}
/** Creates a new instance of CountCache */ G.{)#cR
public CountCache() {} qe/dWJBa
public static void add(CountBean cb){ LOO<)XFJ
if(cb!=null){ {^8->V
list.add(cb); WR|n> i@m
} bv:M
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} LI~ofCp
} ^+J3E4
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CountControl.java ;bYS#Bid{V
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/* %m/W4Nk
* CountThread.java }R&5Ye
* -tPia=^
* Created on 2007年1月1日, 下午4:57 p[LPi5
* VZz>)Kz:
* To change this template, choose Tools | Options and locate the template under 2K:Rrn/cR
* the Source Creation and Management node. Right-click the template and choose Qxb%P<`u
* Open. You can then make changes to the template in the Source Editor. `/"*_AKAI
*/ 57|RE5]|!
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package com.tot.count; }+@GgipyO.
import tot.db.DBUtils; 2/dvCt6 N
import java.sql.*; #jqcUno
/** M7`iAa.}
* B0+r
* @author `*Ju0)g1
*/ 1Zo"Xb
public class CountControl{ [z[<onFIq
private static long lastExecuteTime=0;//上次更新时间 /LK,:6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 F`Ld
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/** Creates a new instance of CountThread */ D$?}M>
public CountControl() {} [ !<
public synchronized void executeUpdate(){ 9 $&$Fe
Connection conn=null; -bP_jIZF;g
PreparedStatement ps=null; dy'
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try{ O~*`YsL9
conn = DBUtils.getConnection(); P->.eo#VG
conn.setAutoCommit(false); b#
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gm8FmjZtf
for(int i=0;i<CountCache.list.size();i++){ eAl;:0=%L
CountBean cb=(CountBean)CountCache.list.getFirst(); rYI7V?
CountCache.list.removeFirst(); K@<%Vc>L(
ps.setInt(1, cb.getCountId()); VN/v]
ps.executeUpdate();⑴ huat,zLS
//ps.addBatch();⑵ wZnv*t_
} Wm^RfxgN/
//int [] counts = ps.executeBatch();⑶ KD =W(\
conn.commit(); ,9.-A-Yw
}catch(Exception e){ }7HR<%<7
e.printStackTrace(); qdNt2SO
} finally{ ISDeLUihY
try{ #d* )W3e2{
if(ps!=null) { dX;Q\
]"
ps.clearParameters(); qP5'&!s&!
ps.close(); BG9.h!
ps=null; `JAM]qB"
} JwNB)e
D
}catch(SQLException e){} WV&grG|
DBUtils.closeConnection(conn); y#iQ
} uGz>AW8a3
} dWi:V7t+
public long getLast(){ [/Vi*Z
return lastExecuteTime; oYmLJzCf
} 7#[8td
public void run(){ *l.tsICmbP
long now = System.currentTimeMillis(); ym*oCfu=
if ((now - lastExecuteTime) > executeSep) { xH4Qv[k
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//System.out.print("lastExecuteTime:"+lastExecuteTime); aovw'O\Q
//System.out.print(" now:"+now+"\n"); i"RBk%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); g4f:K=5:
lastExecuteTime=now; o,gH*
executeUpdate(); p:Hg>Z
} 9#MY(Hr
else{ -d)+G%{
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); B,(zp#&yB
} S{fFpe-
} \r`><d
} 61pJVOe
//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 _Squ%z:D
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类写好了,下面是在JSP中如下调用。 a+=.(g
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<% YwaWhBCIF
CountBean cb=new CountBean(); ^W%#Elf)
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); PBOZ^%k
CountCache.add(cb); xe@11/F
out.print(CountCache.list.size()+"<br>"); M" vd/FV
CountControl c=new CountControl(); 4S1\5C9
c.run(); E(-@F%Q
out.print(CountCache.list.size()+"<br>"); _eZ*_H,\
%>