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: 5X+A"X
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CountBean.java 2?x4vI
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/* h$*!8=M
* CountData.java Ls%MGs9PI
* `2snz1>!j
* Created on 2007年1月1日, 下午4:44 _Y!IEAU/#
* 8-i#8'/x
* To change this template, choose Tools | Options and locate the template under n| ;Im&,
* the Source Creation and Management node. Right-click the template and choose 6wxs1G
* Open. You can then make changes to the template in the Source Editor. f5r0\7y0
*/ @.C2LIb
% `3jL7|
package com.tot.count; xfQ1T)F3g
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/** 8_8l.!~
* &NWEqBz*2
* @author nK,w]{<wG!
*/ 3u;oQ5<(v
public class CountBean { 9iq_rd]
private String countType; Dj +f]~
int countId; %LV9=!w
/** Creates a new instance of CountData */ '%D7C=;^
public CountBean() {} pFXEu=$3
public void setCountType(String countTypes){ J *yg&
this.countType=countTypes; q7!{?\T%
} Fp:'M X
public void setCountId(int countIds){ N0lC0
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this.countId=countIds; e!Hh s/&!T
} IU[ [H#
public String getCountType(){ T|p"0b A
return countType; M{\I8oOg
} VnzZTGs
public int getCountId(){ g*Phv|kI
return countId; ^"g~-
} _+,TT['57s
} j6YOKJX
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CountCache.java Tk>#G{Wb-
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/* U(Zq= M
* CountCache.java ]yu:i-SfP
* \lY_~*J
* Created on 2007年1月1日, 下午5:01 4JEpl'5^Q
* /mHqurB
* To change this template, choose Tools | Options and locate the template under ;*N5Y}?j'
* the Source Creation and Management node. Right-click the template and choose ),)lzN%!
* Open. You can then make changes to the template in the Source Editor. !W\+#ez
*/ m[$_7a5
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package com.tot.count; /{[o~:'p
import java.util.*; mR~&)QBP.
/** ;
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* *#2h/Q.
* @author j+!v}*I![
*/ 9ati`-y2
public class CountCache { B[}6-2<>?C
public static LinkedList list=new LinkedList(); H.;Q+A,8^
/** Creates a new instance of CountCache */ pw#-_
public CountCache() {} 43w}qY1
public static void add(CountBean cb){ >sF)BoLc
if(cb!=null){ 4
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list.add(cb); edD)TpmE,
} 9!GM{
} .VqhV
} jylD6IT
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CountControl.java QnDg6m)+
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/* )_:NLo:
* CountThread.java 1cDF!X]
* ~rm_vo
* Created on 2007年1月1日, 下午4:57 }qUX=s
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* $j~RWfw-
* To change this template, choose Tools | Options and locate the template under 3'Rx=G'
* the Source Creation and Management node. Right-click the template and choose t:S+%u U
* Open. You can then make changes to the template in the Source Editor. gr{ DWCK
*/ z{543~Og59
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package com.tot.count; IgzQr >
import tot.db.DBUtils; 3R/bz0 V>
import java.sql.*; 'R)Tn!6
/** NHt\
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* rjP/l6
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* @author @CoIaUVP
*/ lYIH/:T
public class CountControl{ JT?h1v<H]
private static long lastExecuteTime=0;//上次更新时间 WA qINLdX
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _g8yDfcLG
/** Creates a new instance of CountThread */ ^Pf WG*
public CountControl() {}
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public synchronized void executeUpdate(){ GY*p?k<i
Connection conn=null; :m;p:l|W
PreparedStatement ps=null; 54,er$$V
try{ pCDmXB
conn = DBUtils.getConnection(); W)/#0*7
conn.setAutoCommit(false); 5G#n"}T
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ^q&x7Kv%
for(int i=0;i<CountCache.list.size();i++){ F@t3!bj9
CountBean cb=(CountBean)CountCache.list.getFirst(); {:s f7
CountCache.list.removeFirst(); #mT"gs
ps.setInt(1, cb.getCountId()); s"|Pdc4
ps.executeUpdate();⑴ Wqnc{oq|$
//ps.addBatch();⑵ VTM/hJmwJ
} =I<R! ZSN
//int [] counts = ps.executeBatch();⑶ aXVFc5C\
conn.commit(); (:_$5&i7
}catch(Exception e){ hp2t"t
e.printStackTrace(); 965jtn
} finally{ VVZ'i.*_3?
try{ hgmCRC
if(ps!=null) { W^Yxny
ps.clearParameters(); D9df=lv
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ps.close(); ~[ jQ!tz
ps=null; |pK!S
} gi8FHSU|G
}catch(SQLException e){} wY#E?,
DBUtils.closeConnection(conn); R-:2HRaA
} ?[AD=rUC
} c$,P ~Ws'
public long getLast(){ HQ g^
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return lastExecuteTime; w]H->B29C
} sK{e*[I>W
public void run(){ 9x8fhAy}4
long now = System.currentTimeMillis(); 5R-6ji
if ((now - lastExecuteTime) > executeSep) { b
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//System.out.print("lastExecuteTime:"+lastExecuteTime); 0[`^\Mv4y
//System.out.print(" now:"+now+"\n"); Y73C5.dNcE
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); :h$$J
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lastExecuteTime=now; _w{Qtj~s|
executeUpdate(); !VJoM,b8
} Wzh`or
else{ 1x)J[fyId
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); sx%[=g+<2(
} D-c4EV
} #R"*c
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} p ?!/+
//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 rsQtMtS2
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类写好了,下面是在JSP中如下调用。 3mgD(,(^
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<% ^ c<Ve'-
CountBean cb=new CountBean(); ]'}L 1r
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 53D]3
CountCache.add(cb);
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out.print(CountCache.list.size()+"<br>"); WY/}1X9.%
CountControl c=new CountControl(); $X6h|?3U,
c.run();
}pYqWTG
out.print(CountCache.list.size()+"<br>"); >j/w@Fj
%>