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: (:TjoXXiY
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CountBean.java ;=eDO(Ij
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/* ~J wb`g.
* CountData.java RKHyw08
* (2J: #
* Created on 2007年1月1日, 下午4:44 eg\v0Y!rI
* cl[BF'.H
* To change this template, choose Tools | Options and locate the template under 5\5/
* the Source Creation and Management node. Right-click the template and choose Y)0*b5?1r
* Open. You can then make changes to the template in the Source Editor. DS.RURzd{r
*/ A}G7l?V&
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package com.tot.count; CrC^1K
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/** %Gz0^[+
* )t0$qd ]
* @author Vd,jlt.t
*/ ([\
public class CountBean { 0QXVW}`hz
private String countType; +%T\`6
int countId;
Ch&a/S}
/** Creates a new instance of CountData */ ]'!f28Ng-
public CountBean() {} 0%&1\rm+j
public void setCountType(String countTypes){ @5=oeOg36
this.countType=countTypes; d6}r#\
} D0&,?
public void setCountId(int countIds){ VRWAm>u
this.countId=countIds; fHE<(
} *}F3M\
public String getCountType(){ b~KDP+Ri
return countType; Q]Y*K
} q0i(i.h
public int getCountId(){ 8Wrh]egu1
return countId; !;&p"E|b#
} (6?9B lH~
} q>_/u"
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CountCache.java twL3\
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/* nhB1D-
* CountCache.java b#uL?f
* @|
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* Created on 2007年1月1日, 下午5:01 @Lpq~ 1eZB
* \\PjKAsh
* To change this template, choose Tools | Options and locate the template under $UMFNjL
* the Source Creation and Management node. Right-click the template and choose Ygm`ZA y
* Open. You can then make changes to the template in the Source Editor. eJF5n#
*/ 8p^bD}lN7
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package com.tot.count;
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import java.util.*; {@H6HqD
/** yzbx .
* rHC>z7+z.
* @author 6Z>FTz_
*/ A>vBQN
public class CountCache { m'Amli@[
public static LinkedList list=new LinkedList(); ''q@>
/** Creates a new instance of CountCache */ O,+1<.;+
public CountCache() {} $?
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public static void add(CountBean cb){ b*;Si7-
if(cb!=null){ 9oyE$S h]
list.add(cb); Jj>?GAir
} NO7J!k?
} +6sy-<ZL:
} Ye"o6_U"
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CountControl.java oI0M%/aM
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/* (7mAt3n
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* CountThread.java (|[2J3ZET
* @oNH@a
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* Created on 2007年1月1日, 下午4:57 6*PYFf`
* B8nf,dj?X
* To change this template, choose Tools | Options and locate the template under 4^p5&5F
* the Source Creation and Management node. Right-click the template and choose JmF l|n/H
* Open. You can then make changes to the template in the Source Editor. iQ tNAj
*/ dT`D:)*:
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package com.tot.count; |jQ:~2U|
import tot.db.DBUtils; @)UZ@ ~R
import java.sql.*; 8ZM?)#`@{
/** lW+\j3?Z$
* :}Xll#.,m
* @author j| v%)A
*/ 5QW=&zI`=
public class CountControl{ `_BNy=`s*
private static long lastExecuteTime=0;//上次更新时间 (n*^4@"2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #^`4DhQ/
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/** Creates a new instance of CountThread */ $Z!`Hb
public CountControl() {} ~qcNEl\-y
public synchronized void executeUpdate(){ .R)D3NZp
Connection conn=null; j|4<i9^}
PreparedStatement ps=null; jlkmLcpf
try{ T m_bz&Q
conn = DBUtils.getConnection(); yWg@v+
conn.setAutoCommit(false); J}htu
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3/aMJR:o
for(int i=0;i<CountCache.list.size();i++){ Hc!
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CountBean cb=(CountBean)CountCache.list.getFirst(); B( ]M&
CountCache.list.removeFirst(); i'a?kSy
ps.setInt(1, cb.getCountId()); 8e*,jH3
ps.executeUpdate();⑴ @XgKYm
//ps.addBatch();⑵ w zYzug
} 7FzA*
//int [] counts = ps.executeBatch();⑶ Of-Rx/
conn.commit(); t|H^`Cv6
}catch(Exception e){ cQ/5qg
e.printStackTrace(); f1`gdQ)H
} finally{ !Z`j2
e}
try{ hU(umL<
if(ps!=null) { :V1W/c
ps.clearParameters(); "8c@sHk(w
ps.close(); "w^!/
ps=null; xe#FUS
3
} bP8Sj16q
}catch(SQLException e){} O;z,qo X
DBUtils.closeConnection(conn); s:OFVlC%\
} 1/RsptN"v
} aK&b{d
public long getLast(){ j K!Au
return lastExecuteTime; FemCLvu
} NiWa7 /Hr
public void run(){ ;'?l$
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long now = System.currentTimeMillis(); kjW+QT?T&
if ((now - lastExecuteTime) > executeSep) { ZO!I.
//System.out.print("lastExecuteTime:"+lastExecuteTime); Qt iDTr
//System.out.print(" now:"+now+"\n"); &%8'8,.
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); R%Qf7Q
lastExecuteTime=now; :H7D~ n
executeUpdate(); ZW-yP2
} ]=.\-K
else{ ?i)f^O
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); o4`hY/<t
} 0)%YNaskj
} @Py/K /
} Ager$uC
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 E4gYemuN
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类写好了,下面是在JSP中如下调用。 )i~cr2Hk
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<% JIOh#VNU
CountBean cb=new CountBean(); NS9B[*"Jl
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); wHsYF`
CountCache.add(cb); 3Vsc 9B"w
out.print(CountCache.list.size()+"<br>"); #hW;Ju73
CountControl c=new CountControl(); sSOOXdnGG
c.run(); !$DIc
out.print(CountCache.list.size()+"<br>"); @|Fg,N<Y]
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