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: vOIzfwYG9
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CountBean.java gfW_S&&q
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/* YcmLc)a7
* CountData.java ~~B`\!n7
* t++
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* Created on 2007年1月1日, 下午4:44 l!d |luqbA
* R ^ln-H;
* To change this template, choose Tools | Options and locate the template under \Zgc
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* the Source Creation and Management node. Right-click the template and choose %$*WdK#
* Open. You can then make changes to the template in the Source Editor. }3TTtd7
*/ $!ATj`}kb
}#<mK3MBe
package com.tot.count; nj(\+l5
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/** %aB
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* jY +u OH
* @author @~+W
*/ QyEGK
public class CountBean { %0gcNk"=
private String countType; QF74'
int countId; S=@bb$4-T
/** Creates a new instance of CountData */ }<9IH%sgF
public CountBean() {} ] oMtqkiR
public void setCountType(String countTypes){ eJvNUBDSH
this.countType=countTypes; n$u@v(I
} Bs!F |x(
public void setCountId(int countIds){ qj#C8Tc7
this.countId=countIds; z*w.A=r
} _X6@.sM/2
public String getCountType(){ TSEv^u)3
return countType; j`o_Stbg
} <Crbc$!OeX
public int getCountId(){ .*k$abb
return countId; ~x-v%x6
} I"hlLP
} i>aIuQ`pe
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CountCache.java S%p.|!
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/* s$wIL//=
* CountCache.java ;]PP+h
* v(`9+*
* Created on 2007年1月1日, 下午5:01 1Uaj}=@M
* ; "K"S[
* To change this template, choose Tools | Options and locate the template under sq45fRAi
* the Source Creation and Management node. Right-click the template and choose !K %8tr4
* Open. You can then make changes to the template in the Source Editor. [a[.tR38e
*/ b$JrLZs$_
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package com.tot.count; N87)rhXSo,
import java.util.*; ;ipT0*Y
/** EZee
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* WZQ
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* @author 6g-Q
*/ (~
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public class CountCache { Jmml2?V-c
public static LinkedList list=new LinkedList(); qGXY
/** Creates a new instance of CountCache */ 8 t5o&8v
public CountCache() {} -FGM>~x
public static void add(CountBean cb){ /7fD;H^*
if(cb!=null){ '5xvR G
list.add(cb); t}wwRWo2?f
} M->BV9
} L']"I^(N
} ak"W/"2:
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CountControl.java }`uFLBG3
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/* eq6>C7.$
* CountThread.java VxAG=E
* Ju@8_ ?8=
* Created on 2007年1月1日, 下午4:57 V~
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* [aF"5G
* To change this template, choose Tools | Options and locate the template under %5ovW<E:
* the Source Creation and Management node. Right-click the template and choose WS6;ad;|
* Open. You can then make changes to the template in the Source Editor. cfC}"As
*/ V)Sw\tS6g
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package com.tot.count; )&s9QBo{b
import tot.db.DBUtils; I&wJK'GM`
import java.sql.*; 1'YUK"i
/** =1+/`w
* QX+Xi<YE-
* @author W QqOXF
*/ 2Bz\Tsp
public class CountControl{ ;Qi0j<dXd
private static long lastExecuteTime=0;//上次更新时间 <
UD90}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 re)7h$f}
/** Creates a new instance of CountThread */ E"zC6iYZ;
public CountControl() {} k!"6mo@rd
public synchronized void executeUpdate(){ \#!B*:u
Connection conn=null; U62Z ?nge%
PreparedStatement ps=null; *_sSM+S
try{ -A^o5s
conn = DBUtils.getConnection(); TZ#^AV=ae
conn.setAutoCommit(false); vyvb-oz;u
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); L]*5cH
for(int i=0;i<CountCache.list.size();i++){ G$[Hm\V
CountBean cb=(CountBean)CountCache.list.getFirst(); gx.\&W b
CountCache.list.removeFirst(); -)Hc^'.
ps.setInt(1, cb.getCountId()); {_R{gpj'
ps.executeUpdate();⑴ 64qqJmG3
//ps.addBatch();⑵ ( _3QZ
} UB,0c)
//int [] counts = ps.executeBatch();⑶ gE9x+g
conn.commit(); KU^|T2s%
}catch(Exception e){ +Kp8X53
e.printStackTrace(); j;J`PH
} finally{ tTbfyI
try{ UCo`l~K)qg
if(ps!=null) { rV
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ps.clearParameters(); {8"Uxj_6V
ps.close(); >zfFvx_q
ps=null; 3/ '5#$
} .sSbU^U
}catch(SQLException e){} jbe_r<{
DBUtils.closeConnection(conn); ,B#*<_?E5
} [D"5@
} YQ>O6:%
public long getLast(){ H6hhU'Kxf8
return lastExecuteTime; 9\VV++}s>o
} >mj WC) U
public void run(){ d*dPi^JjC
long now = System.currentTimeMillis(); 7l4}b^>/`
if ((now - lastExecuteTime) > executeSep) { QIfP%,LT
//System.out.print("lastExecuteTime:"+lastExecuteTime); @D$ogU,#
//System.out.print(" now:"+now+"\n"); jN!VrRA
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); jdkqJ4&i
lastExecuteTime=now; %6la@i
executeUpdate(); u
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} \olY)b[
else{ Z>[n~{-,p
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); p2
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} >*EJ6FPO
} $ I
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} j8+>E?nm
//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 KMx
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类写好了,下面是在JSP中如下调用。 -^JPY)\R
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<% a-lF}P\
CountBean cb=new CountBean(); kDG?/j90D
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); /!sGO:
CountCache.add(cb); OBf$Z"i
out.print(CountCache.list.size()+"<br>"); X/Ii}X/p
CountControl c=new CountControl(); qIxe)+.
c.run(); .O SQ8W}
out.print(CountCache.list.size()+"<br>"); o$ #q/L
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