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~\fpay
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CountBean.java C`F*00M{
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/* MS{purD
* CountData.java FC.d]XA%/d
* ` aTkIo:ms
* Created on 2007年1月1日, 下午4:44 YxH"*)N
* Kp")
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* To change this template, choose Tools | Options and locate the template under H\ A!oB,sw
* the Source Creation and Management node. Right-click the template and choose &IGTCTBP
* Open. You can then make changes to the template in the Source Editor. DXPiC[g]
*/ 7Mxw0J
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package com.tot.count; eto3dJ!R
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/** YDBQ6X
* /60`"xH
* @author X+;F5b9z
*/ xEBiBskd
public class CountBean { V$u~}]z
private String countType; ~2xC.DF_N
int countId; Pf
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/** Creates a new instance of CountData */ {~DYf*RZ
public CountBean() {} [9f
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public void setCountType(String countTypes){ k8^!5n
this.countType=countTypes; nOxCni~T
} a' "4:(L
public void setCountId(int countIds){ )/FB73!
this.countId=countIds; +(/?$dRH
} Vx_lI
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public String getCountType(){ U~z`u&/
return countType; 0-~Y[X"9.
} /3D!,V,
public int getCountId(){ #yZZ$XO k
return countId; ?c)PBJ+]
} q0Fq7rWP
} ZN!OM)@:!
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CountCache.java =G9%Hz5~:
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/* l!f/0Rx5
* CountCache.java "&/:"~r
* P 3uAS
* Created on 2007年1月1日, 下午5:01 *_d+c G
* WjZJQK
* To change this template, choose Tools | Options and locate the template under e:H7ht:
* the Source Creation and Management node. Right-click the template and choose gd'#K~?
* Open. You can then make changes to the template in the Source Editor. BCB"&:}
*/ zAEq)9Y"l'
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package com.tot.count; 9"_JiX~3
import java.util.*; Ws?BAfP
/** $,ev <4I&
* {GDMix
* @author (j8tdEt
*/ ?(GMe>
public class CountCache { WT Pp/Nq'
public static LinkedList list=new LinkedList(); UJG)-x
/** Creates a new instance of CountCache */ Pxu!,Mi[d
public CountCache() {} Z;shFMu
public static void add(CountBean cb){ P9Hv){z
if(cb!=null){ sZFIQ)b9
list.add(cb); ,j
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} >E^?<}E~.
} Z!Sv/5xx
} J{'
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CountControl.java |D)NPN&
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/* ul~>eZ
* CountThread.java PT4Xr=z =
* rP.qCl+J
* Created on 2007年1月1日, 下午4:57 <tK6+isc
* CBx 1.xL
* To change this template, choose Tools | Options and locate the template under H=]$9ZH!
* the Source Creation and Management node. Right-click the template and choose r,=xI`XH
* Open. You can then make changes to the template in the Source Editor. e#Jx|Ej=
*/ #.p^S0\pw
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package com.tot.count; "UVqkw,vt
import tot.db.DBUtils; DUf=\p6`f
import java.sql.*; 6Uq@v8mh
/** quc?]rb
* vPEL'mw/3#
* @author [0CoQ5:d?&
*/ 1 GUF,A+_O
public class CountControl{ r$=MBeT
private static long lastExecuteTime=0;//上次更新时间 _F
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 DG8]FhD^b
/** Creates a new instance of CountThread */ Et@= <g
public CountControl() {} \{J gjd
public synchronized void executeUpdate(){ %?+A.0]E
Connection conn=null; Z"Z&X0Oj
PreparedStatement ps=null; F7J-@T<
try{ &,+G}
conn = DBUtils.getConnection(); `*e',j2}UU
conn.setAutoCommit(false); 5sC{5LJzC
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); q /EK]B
for(int i=0;i<CountCache.list.size();i++){ k: PO"<-U
CountBean cb=(CountBean)CountCache.list.getFirst(); '5wa"/ ?w
CountCache.list.removeFirst(); uRG0}>]|U
ps.setInt(1, cb.getCountId()); [P)'LY6F
ps.executeUpdate();⑴ =-jkp
//ps.addBatch();⑵ |Q:$G!/
} qgrRH'
//int [] counts = ps.executeBatch();⑶ I_.(&hMn
conn.commit(); x{<WJ|'B
}catch(Exception e){ ug[|'tR8
e.printStackTrace(); pI7\]e
} finally{ e8gJ }8Fj
try{ @PuJre4!;L
if(ps!=null) { %lz \w{
ps.clearParameters(); UK+;/Mtg
ps.close(); qdh;zAMx
ps=null; "L.)ML
} qC?J`
}catch(SQLException e){} ]O',Ei^
DBUtils.closeConnection(conn); QU16X
} XyJ*>;q
} le yhiL<
public long getLast(){ CJg &
return lastExecuteTime; T+NEw8C?/
} #T
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public void run(){ z=<T[Uy
long now = System.currentTimeMillis(); a#FkoA~M
if ((now - lastExecuteTime) > executeSep) { CyO2Z
//System.out.print("lastExecuteTime:"+lastExecuteTime); p%,:U8fOR
//System.out.print(" now:"+now+"\n"); ElhTB
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); x*}j$n( Oa
lastExecuteTime=now; {YWj`K
executeUpdate();
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} sR,]eo<p&
else{ * X\i=
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 1i#uKKwE
} :s+AIo6
} 0F=UZf&
} xksQMS2#
//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 n[n0iz1-
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类写好了,下面是在JSP中如下调用。 g 'c4&Do
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<% HxAq& J;xu
CountBean cb=new CountBean(); /A}3kTp
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); f 7{E(,
CountCache.add(cb); OGg9e
out.print(CountCache.list.size()+"<br>"); Htl6Mr*{
CountControl c=new CountControl(); ^DXERt&3
c.run(); dsX{5
out.print(CountCache.list.size()+"<br>"); 7!w@u6Q
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