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: wn|;Li
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CountBean.java `GlOl-
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/* Anqt:(
* CountData.java ).0p\.W~
* K7C!ZXw~
* Created on 2007年1月1日, 下午4:44 j&U7xv
* Vk2%yw>
* To change this template, choose Tools | Options and locate the template under @4KKm@(p85
* the Source Creation and Management node. Right-click the template and choose l8:!{I?s=
* Open. You can then make changes to the template in the Source Editor. -x:7K\=$SX
*/ kd_!S[
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package com.tot.count; 5!pNo*QK
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/** :5'hd^Q
* yE.st9m
* @author -[&Z{1A4x4
*/ f,|;eF-Z
public class CountBean { \Ui8gDJ8y5
private String countType; X"mPRnE330
int countId; _zzT[}
/** Creates a new instance of CountData */ 6`%|-o
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public CountBean() {} G(wstHT;/
public void setCountType(String countTypes){ %Pl |3 i
this.countType=countTypes; D=Nt0y
} .mg0L\
public void setCountId(int countIds){ P)XR9&o':
this.countId=countIds; 9G"4w` P
} :4x6dYNU
public String getCountType(){ u\/TR#b
return countType; TaaCl#g$?
} 3sIdwY)ZS_
public int getCountId(){ '4D7:
return countId; *3OlWnZ?
} Bn%?{z)
} c<~DYe;;
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CountCache.java j^v<rCzc(
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/*
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* CountCache.java B*E"yB\NV
* I[gPW7&S@
* Created on 2007年1月1日, 下午5:01 WvoIh4]
* 9$qw&j[
* To change this template, choose Tools | Options and locate the template under -e?n4YO*\
* the Source Creation and Management node. Right-click the template and choose VKw.g@BY
* Open. You can then make changes to the template in the Source Editor. XR p60i6f
*/ lqgR4 !
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package com.tot.count; !KT.p2\
import java.util.*; #;lEx'lKN
/** T+t7/PwC;
* W5e>Z&&
* @author A|@d{g
*/ k]P'D
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public class CountCache { #c"05/=A
public static LinkedList list=new LinkedList(); YHke^Ind
/** Creates a new instance of CountCache */ (CtRU
public CountCache() {} *a0#PfS[
public static void add(CountBean cb){ aIr"!. 4
if(cb!=null){ Sn
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list.add(cb); k2 _y84;D
} I2NMn5>
} [}
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} 9eE
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CountControl.java ?5;wPDsK
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/* 8Fbt >-N<\
* CountThread.java S$P=;#r
* ;9-J=@KY4
* Created on 2007年1月1日, 下午4:57 0,):;OI
* jq_4x[
* To change this template, choose Tools | Options and locate the template under jeO`45O
* the Source Creation and Management node. Right-click the template and choose 0"N4WH O
* Open. You can then make changes to the template in the Source Editor. __uk/2q
*/ ar'VoL}
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package com.tot.count; {j<?+o5A
import tot.db.DBUtils; SMU8U
import java.sql.*; > PL}7f&:
/** [H9<JdUZ
* V$iA3)7W%
* @author /,j'Vr\"
*/ 8/y8tMm]
public class CountControl{
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private static long lastExecuteTime=0;//上次更新时间 mi5bk>o
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 u*oP:!s
/** Creates a new instance of CountThread */ EG_P^<z
public CountControl() {} KV'3\`v@LY
public synchronized void executeUpdate(){ .m%5Esx
Connection conn=null; hYA1N&yz@
PreparedStatement ps=null; >* F#ZZv}p
try{ \l# H#~
conn = DBUtils.getConnection(); %kH,Rl\g
conn.setAutoCommit(false); X'%BS
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); hY *^rY'
for(int i=0;i<CountCache.list.size();i++){ 6Bd:R}yZP7
CountBean cb=(CountBean)CountCache.list.getFirst(); (y\.uPu!
CountCache.list.removeFirst(); VP ?Q$?a
ps.setInt(1, cb.getCountId()); U+(qfa5(
ps.executeUpdate();⑴ &N3a`Ua
//ps.addBatch();⑵ k^B7M}
} \q^dhY>)
//int [] counts = ps.executeBatch();⑶ 4(Y-TFaf
conn.commit(); uKJo5%>
}catch(Exception e){ EpCNp FQT<
e.printStackTrace(); $bBUL C
} finally{ CG J_k?h
try{ sebuuL.l0<
if(ps!=null) { j xq89x
ps.clearParameters(); &Ot9"Aq:
ps.close(); ,?%o ~
ps=null; YluvWHWi
} ]D^; Ca
}catch(SQLException e){} Y[m*
DBUtils.closeConnection(conn); 4
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} j~cG#t]
} ;7JyL|2
public long getLast(){ `d
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return lastExecuteTime; |="Y3}a
} (9] =;)
public void run(){ $%ztP
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long now = System.currentTimeMillis(); B <HD
if ((now - lastExecuteTime) > executeSep) { "CFU$~
//System.out.print("lastExecuteTime:"+lastExecuteTime); /R(
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//System.out.print(" now:"+now+"\n"); Iu;VFa
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); z~1S/,Ca
lastExecuteTime=now; 1pN8,[hyR7
executeUpdate(); | OZ>5
} mVK^gJ3
else{ P8ns @VV
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); `V*$pHo
} Np.<&`p!
} &s\/Uq
} q^QLNKOH"
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 =}e{U&CX
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类写好了,下面是在JSP中如下调用。 /$FpceB!W
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<% :&RpB^]
CountBean cb=new CountBean(); I Vw'YtZ
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); wc}4:~
CountCache.add(cb); <c
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out.print(CountCache.list.size()+"<br>"); KJV],6d
CountControl c=new CountControl(); FuFICF7+C
c.run(); SuBUhzR
out.print(CountCache.list.size()+"<br>"); Q[aBxy
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