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: E kb9=/
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CountBean.java pmm?Fq!s=
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/* 4uQ\JD(*Eu
* CountData.java \;al@yC=T
* l^.d3b
* Created on 2007年1月1日, 下午4:44 l@ +lUx8
* n#jBqr&!M
* To change this template, choose Tools | Options and locate the template under _lWC)bv`
* the Source Creation and Management node. Right-click the template and choose cE{hy7cH
* Open. You can then make changes to the template in the Source Editor. m5!~PG:_
*/ I
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package com.tot.count; Yt]tRqrh;T
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/** iD*%' #u
* #nK38W#
* @author C,*3a`/2M^
*/ 4&r5M
public class CountBean { M^q< qS>d
private String countType; 20 <$f
int countId; T:v.]0l~
/** Creates a new instance of CountData */ N$\'X<{
public CountBean() {} @DiXe[kI
public void setCountType(String countTypes){ 8*nv+
this.countType=countTypes; 9Fo00"q
} #Tc]L<."
public void setCountId(int countIds){ Ban@$uf
this.countId=countIds; =>?;Iv'Z
} L<t>o":o
public String getCountType(){ C`G+b{o
return countType; U0%T<6*H
} icO$9c
public int getCountId(){
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return countId; 6Zr_W#SE
} [HRry2#s
} 0 ge"ISK
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CountCache.java JD`IPQb~E
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/* C bWz;$r
* CountCache.java uDtml$9rN
* pUcN-WA
* Created on 2007年1月1日, 下午5:01 /KU9sIE;
* m:6^yfS
* To change this template, choose Tools | Options and locate the template under ZmLA4<
* the Source Creation and Management node. Right-click the template and choose oI\Lepl*
* Open. You can then make changes to the template in the Source Editor. ,6J{-Iu
*/ {yo{@pdX>
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package com.tot.count; C VXz>oM
import java.util.*; (:(Imk;9
/** 'hoEdJ]t5
* ojc m%yd
* @author OLH[F
*/ v}cTS@0
public class CountCache { xK*G'3Ge
public static LinkedList list=new LinkedList(); <E2nM,
/** Creates a new instance of CountCache */ D`Cy]j
public CountCache() {} {6I)6}w!k
public static void add(CountBean cb){ &@v&5EXOw
if(cb!=null){ x/S:)z%X
list.add(cb); AjYvYMA&
} La2f]+sV
} 9ZD>_a
} |e QwI&
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CountControl.java o8B$6w:_
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/* ~D0e\Q(A
* CountThread.java ;f!}vo<;
* 9cIKi#Bl
* Created on 2007年1月1日, 下午4:57 [mcER4]}
* RM3"8J
* To change this template, choose Tools | Options and locate the template under I3.cy i
* the Source Creation and Management node. Right-click the template and choose EXbaijHQG
* Open. You can then make changes to the template in the Source Editor. H5eGl|Z5]^
*/ 8C=8Wjm
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package com.tot.count; (|2:^T+
import tot.db.DBUtils; 1YtbV3
import java.sql.*; o.g)[$M8cF
/** wM``vx[/
* 8x`EUJ
* @author rYCIU
*/ .[:y`PCF
public class CountControl{ 8zO;=R A7%
private static long lastExecuteTime=0;//上次更新时间 M nnVk=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I]-"Tw
/** Creates a new instance of CountThread */ TtWWq5X|
public CountControl() {} !BjJ5m
public synchronized void executeUpdate(){ r'<!wp@
Connection conn=null; 8dLK5"_3
PreparedStatement ps=null; #G]g
try{ or`D-x)+@
conn = DBUtils.getConnection(); $EnBigb!
conn.setAutoCommit(false); BC)1FxsGf
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); G.:QA}FE'
for(int i=0;i<CountCache.list.size();i++){ 2Ah B)8bG
CountBean cb=(CountBean)CountCache.list.getFirst(); #2dH2k\F
CountCache.list.removeFirst(); MmQk@~
ps.setInt(1, cb.getCountId()); 6Zx)L|B
ps.executeUpdate();⑴ 6J<R;g23R]
//ps.addBatch();⑵ S@@#L
} }2''}-Nc
//int [] counts = ps.executeBatch();⑶ Ce:w^P+
conn.commit(); C ~Doj
}catch(Exception e){ 'd]t@[#
e.printStackTrace(); PQrc#dfc|
} finally{ UmL Boy&*
try{ +yxL}=4s
if(ps!=null) { BU O8Z]
ps.clearParameters(); =@P]eK/
ps.close(); ap<r)<u
ps=null; r8>Qs RnU%
} `Krk<G
}catch(SQLException e){} c6cB
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DBUtils.closeConnection(conn); pHKc9VC
} ~?Zm3zOCc2
} ;+*/YTkC+P
public long getLast(){ Z3f}'vr
return lastExecuteTime; V*W H
} G5NAwpZf
public void run(){ <m> m"|G
long now = System.currentTimeMillis(); qb$M.-\ne
if ((now - lastExecuteTime) > executeSep) { N_E)f
//System.out.print("lastExecuteTime:"+lastExecuteTime); Jo\karpb
//System.out.print(" now:"+now+"\n"); "%w E>E
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); S;tvt/\!Z
lastExecuteTime=now; mZ g'
executeUpdate(); \F14]`i
} /H$:Q|T}
else{ N j:W6? A
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )3ZkKv;zY
} De\Ocxx
} >]x%+@{|
} 4'y@ne}g!
//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 z8j7K'vV1
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类写好了,下面是在JSP中如下调用。 H-3*},9
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<% TiKfIv
CountBean cb=new CountBean(); Hq|{Nt%Q
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); x_- SAyH
CountCache.add(cb); C_&ZQlgQ
out.print(CountCache.list.size()+"<br>"); 19i=kdH
CountControl c=new CountControl(); 1aezlDc*
c.run(); QtLd(&
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out.print(CountCache.list.size()+"<br>"); P&Wf.qr{:
%>