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: W!+eJ!Da
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CountBean.java 3, 3n
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/* usNq]
* CountData.java :*vSC: q
* Xyu0np;@
* Created on 2007年1月1日, 下午4:44 }Ui)xi:8
* nf-6[dg
* To change this template, choose Tools | Options and locate the template under 2uT@jfj:r
* the Source Creation and Management node. Right-click the template and choose [s+FX5' K
* Open. You can then make changes to the template in the Source Editor. k$.l^H u
*/ (tF/2cZk
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package com.tot.count; V#B'm?aQ
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/** O))j
* #3O$B*gV6
* @author <O41M\,
*/ sHPlNwyy
public class CountBean { S"fqE%
private String countType; "AlR%:]24~
int countId; <vzU}JA\
/** Creates a new instance of CountData */ cpH*!*S
public CountBean() {} &?I3xzvK
public void setCountType(String countTypes){ ~(L&*/c
this.countType=countTypes; MH]?:]K9V
} Y3ypca&P9
public void setCountId(int countIds){ ivSpi?
this.countId=countIds; _QtW)\)5\
} AHT(Z~C
public String getCountType(){ {)4@rM
return countType; _$mS=G(
} BA9;=orx
public int getCountId(){ H:t2;Z'
return countId; <^+&A7Q-_
} Of
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} oMxpdG3y-
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CountCache.java C@MJn)$4
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/* h m(
* CountCache.java B~3qEdoK5`
* W,%qL6qV
* Created on 2007年1月1日, 下午5:01 #b1/2=PA
* Zf?jnDA
* To change this template, choose Tools | Options and locate the template under ZO \bCrk
* the Source Creation and Management node. Right-click the template and choose s
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* Open. You can then make changes to the template in the Source Editor. L @8[.
*/ +7t: /_b~
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package com.tot.count; i;#AW($+a
import java.util.*; ks8x xY
/** } d7o-
* |H8UT SX+
* @author UQ2;Dg G%
*/ a]x\e{
public class CountCache { A:?w1"7gT
public static LinkedList list=new LinkedList(); :5zO!~\
/** Creates a new instance of CountCache */ =YR+`[bfI
public CountCache() {} ,oj)`?Vh
public static void add(CountBean cb){ "oCXG`.k&
if(cb!=null){ -vS7 %Fbr
list.add(cb); (PnrY~9
} W0Q;1${
} ~
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} GV
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CountControl.java !7uFH PK-
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/* ACH!Gw~
* CountThread.java Y.o-e)zX
* x;/%`gKn8
* Created on 2007年1月1日, 下午4:57 uX,ln(9I*H
* [M:BJ%*
* To change this template, choose Tools | Options and locate the template under K9UWyM<(2C
* the Source Creation and Management node. Right-click the template and choose !'%`g,,r
* Open. You can then make changes to the template in the Source Editor. y7#vH<
*/ YRP$tz+
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package com.tot.count; b %I2ig
import tot.db.DBUtils; tJ9`Ys
import java.sql.*; Fy]j33E
/** 2a:JtJLl
* rxAb]~MMp
* @author w24@KaKFo
*/ *mXs(u
public class CountControl{ zI3Bb?4.
private static long lastExecuteTime=0;//上次更新时间 @&]%%o+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3+ r8yiY
/** Creates a new instance of CountThread */ Hh.l,Z7i7D
public CountControl() {} mkt%|Kb.
public synchronized void executeUpdate(){ NpY zN|W:
Connection conn=null; "4qv
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PreparedStatement ps=null; . xdSUe
try{ )3~):+
conn = DBUtils.getConnection(); (SYSw%v$A
conn.setAutoCommit(false); s:#\U!>0`
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [O(8izv
for(int i=0;i<CountCache.list.size();i++){ )k|_ CW~
CountBean cb=(CountBean)CountCache.list.getFirst(); j]5bs*G
CountCache.list.removeFirst(); /0qLMlL$
ps.setInt(1, cb.getCountId()); y2,M9
ps.executeUpdate();⑴ Kdwt^8Umh
//ps.addBatch();⑵ 4>W ov
} cp>1b8l6?
//int [] counts = ps.executeBatch();⑶ S&YC"
conn.commit(); JA~v:ec
}catch(Exception e){ pe$l'ur
e.printStackTrace(); myeez+@ m
} finally{ /<$\)|r
try{ pT` oC&
if(ps!=null) { Sq,x57-
ps.clearParameters(); L) ]|\|
ps.close(); ("B[P/
ps=null; |[}!E/7>b
} 0xYPK7a=L\
}catch(SQLException e){} L^0s
DBUtils.closeConnection(conn); Xn
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} 69$[yt>KYz
} Yq?FiE0
public long getLast(){ k*3F7']8
return lastExecuteTime; <,!e*V*U
} vC9Qe
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public void run(){ RrGFGn{
long now = System.currentTimeMillis(); JXIxk"m
if ((now - lastExecuteTime) > executeSep) { [Q2"OG@Q
//System.out.print("lastExecuteTime:"+lastExecuteTime); RHc-kggk!
//System.out.print(" now:"+now+"\n"); r{T}pc>^
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9=J+5V^qD<
lastExecuteTime=now; AD=vYDR+
executeUpdate(); 0//?,'.
} [Grd?mc#
else{ As;@T$G
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =-e`OHA
} ^"e|)4_5\
} ""JTU6]MS
} #ONad0T;
//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 #~(VOcRI
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类写好了,下面是在JSP中如下调用。 c05kHB$O
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<% Mbua!m(0
CountBean cb=new CountBean(); +$-@8,F>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]b"Oy}ARW
CountCache.add(cb); gxIGL-1M
out.print(CountCache.list.size()+"<br>"); bV5 {
CountControl c=new CountControl(); PE~umY]
c.run(); #JFTD[1
out.print(CountCache.list.size()+"<br>"); _bi]Bpxf
%>