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: 4:Ju|g]O
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CountBean.java 2ib,33 Z
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/* WHOy\j},V
* CountData.java 8jL^q;R_(
* P*K"0[\n
* Created on 2007年1月1日, 下午4:44 AY<L8
* lDKyD`WKnZ
* To change this template, choose Tools | Options and locate the template under mS;WNlm\
* the Source Creation and Management node. Right-click the template and choose -}j(_]t
* Open. You can then make changes to the template in the Source Editor. )p;t
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*/ )CE]s)6+2
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package com.tot.count; p<0=. ~
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/** #6YpV)
* Hf1b&8&:K
* @author f_LXp$n
*/ n/*" 2
public class CountBean { )16+Pm8
private String countType; 5Uy*^C7M^
int countId; UY({[?Se
/** Creates a new instance of CountData */ LY)Wwl*wc
public CountBean() {} S *J{
public void setCountType(String countTypes){ Wtk|}>Pf
this.countType=countTypes; 5%QYe]D
} W)]&G}U<
public void setCountId(int countIds){ p$x>I3C(\
this.countId=countIds; I8T*_u^_
} Ah@e9`_r
public String getCountType(){ [Y.JC'F#
return countType; g$"x,:2x{
} '-n
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public int getCountId(){ F !OD*]
return countId; `^on`"\{u
} :6)!#q'g
} U,T#{
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CountCache.java 4G;KT~Cgb
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/* +/[Rvh5WZ
* CountCache.java Z rNH:Z:5
* 3Rsrb
* Created on 2007年1月1日, 下午5:01 \r{wNqyv
* ThW9=kzQW
* To change this template, choose Tools | Options and locate the template under mAW(j@5sp
* the Source Creation and Management node. Right-click the template and choose lf
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* Open. You can then make changes to the template in the Source Editor. _dAn/rj
*/ L8'4d'N+>
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package com.tot.count; @gf <%>
import java.util.*; Gl3g.`X{$@
/** ~Eik&5 z
* 5eFtcK
* @author sh` 3$ {
*/ |Thm5,ao
public class CountCache { F=*t]X[z}
public static LinkedList list=new LinkedList(); #hs&)6Sf
/** Creates a new instance of CountCache */ Q hRj*,
public CountCache() {} <6hs<qXqi
public static void add(CountBean cb){ nTs\zikP
if(cb!=null){ roG<2i F
list.add(cb); UA6
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} 9fTl6?x
} be_h
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} P Gxv4(%
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CountControl.java %G6x \[,
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/* a Iyzt
* CountThread.java -AVT+RE9z
* vlDA/( &
* Created on 2007年1月1日, 下午4:57 OtQ]\:p7
* l<S3<'&
* To change this template, choose Tools | Options and locate the template under $I#~<bW,
* the Source Creation and Management node. Right-click the template and choose Rc D5X{qS#
* Open. You can then make changes to the template in the Source Editor. fwzyCbks
*/ Yh"9,Z&wiR
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package com.tot.count; i
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import tot.db.DBUtils; 7J$rA.tu
import java.sql.*; (M{wkQTO
/** |d6/gSiF
* ;O,&MR{;|n
* @author ;H71A[M
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*/ |FlB#
public class CountControl{ RhF<{U.
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 @ra JB'
/** Creates a new instance of CountThread */ ~+BU@PHv
public CountControl() {} 'h~IbP
public synchronized void executeUpdate(){ l9+CJAmq
Connection conn=null; %'=TYvB 2
PreparedStatement ps=null; U Lq`!1{
try{ QJR},nZ3
conn = DBUtils.getConnection(); O)&ME
conn.setAutoCommit(false); uP8 cW([
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); k`[>Bk%b
for(int i=0;i<CountCache.list.size();i++){ GvA4.s,
CountBean cb=(CountBean)CountCache.list.getFirst(); I3x+pa^]2
CountCache.list.removeFirst(); /L!
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ps.setInt(1, cb.getCountId()); D( TfW
ps.executeUpdate();⑴ AOL=;z9c#
//ps.addBatch();⑵ >nK (
} RASk=B
//int [] counts = ps.executeBatch();⑶ TBF{@{.d
conn.commit(); ,1<6=vL
}catch(Exception e){ OzRo
e.printStackTrace(); ix?Z:pIS0
} finally{ rXTdhw?+
try{ UaQW<6+
if(ps!=null) { z1tCSt}7f
ps.clearParameters(); VRY@}>W'
ps.close(); l_+q a6C*
ps=null; xZV|QVY;
} b!"qbC1
}catch(SQLException e){} +[S<"}ls7
DBUtils.closeConnection(conn); &js$qgY
} |6Iw\YU
} 4{6,Sx
public long getLast(){ o?.VW/"
return lastExecuteTime; /9P7;1?
} _wW"Tn]
public void run(){ YxU->Wi]G
long now = System.currentTimeMillis(); \sW>Y#9]
if ((now - lastExecuteTime) > executeSep) { !@ AnwV]
//System.out.print("lastExecuteTime:"+lastExecuteTime); ~W B-WI\
//System.out.print(" now:"+now+"\n"); #q&Nd2y
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); w`#9Re
lastExecuteTime=now; UA0(
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executeUpdate(); B*QLKO:)i
} o(3OChH
else{ LT,zk)5
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); q_>=| b
} ?&U~X)Q
} @fVz
*
} K3rsew
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 dOgc%(kz
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类写好了,下面是在JSP中如下调用。 H6$pA^
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<% '=K~M
CountBean cb=new CountBean();
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); biQ~q$E
CountCache.add(cb); nvodP"iV
out.print(CountCache.list.size()+"<br>"); _71I9V&
CountControl c=new CountControl(); w>RwEU+w=@
c.run(); >7W8_6sC<
out.print(CountCache.list.size()+"<br>"); Gh%dVP9B@P
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