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: *Rc?rMF !
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CountBean.java w2r*$Q
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/* XuU>.T$] c
* CountData.java /7-FVqDx8
* |Fq\%y#
* Created on 2007年1月1日, 下午4:44 kpQN>XV#
* %UV"@I+
* To change this template, choose Tools | Options and locate the template under =">0\#
* the Source Creation and Management node. Right-click the template and choose )"E1/$*k
* Open. You can then make changes to the template in the Source Editor. |n(b>.X
*/ %PK(Z*>
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package com.tot.count; N)KN!!
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/** IhK%.B{dZ
* C2DAsSw
* @author UyDq`@h
*/ &nY#GHB
public class CountBean { v,iq,p)&
private String countType; b.)jJLWv@
int countId; (!Fu5m=<8
/** Creates a new instance of CountData */ *I k/Vu%;
public CountBean() {} xi)M8\K
public void setCountType(String countTypes){ <anU#bEuQ
this.countType=countTypes; S*WLb/R2
} (/i|3 P
public void setCountId(int countIds){ j`MK\*qmz
this.countId=countIds; =}SLQdT
} sAF="uB
public String getCountType(){ 58o&Dv6?
return countType; 7De BeY
} veS)
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public int getCountId(){ k<rJm
P{
return countId; bPuO~#iN~
} MK!Aq^Jz
} !H6X%hlk
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CountCache.java FrV8_[
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/* ZRFHs>0
* CountCache.java }8`>n4
* p>W@h*[6w
* Created on 2007年1月1日, 下午5:01 LQ||7>{eX
* 9)4_@rf%
* To change this template, choose Tools | Options and locate the template under gq}c
* the Source Creation and Management node. Right-click the template and choose h)z2#qfc
* Open. You can then make changes to the template in the Source Editor. s&\krW&
*/ s$^2Qp
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package com.tot.count; pxW*kS
import java.util.*; yI%q3lB}^
/** }|Bs|$q
* 2_)gJ_kP
* @author rshUF
*/ *dsI>4%m
public class CountCache { Fj"/jdM
public static LinkedList list=new LinkedList(); ;ssI8\LG
/** Creates a new instance of CountCache */ ,}wFQ9*|W
public CountCache() {} 3h}i="i
public static void add(CountBean cb){ p+b$jKWQ
if(cb!=null){ {*K$gH$
list.add(cb); %pf9Yd0t
} j@{dsS:6
} e-b>
} 'c3'eJ0
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CountControl.java R 'fEw3^
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/* aDu[iaZ
* CountThread.java {$v^2K'C
* 32`Z3-
* Created on 2007年1月1日, 下午4:57 !-ZY_
* )mjGHq2
* To change this template, choose Tools | Options and locate the template under %OP|%^2
* the Source Creation and Management node. Right-click the template and choose > }kZXeR|
* Open. You can then make changes to the template in the Source Editor. )UyJ.!Fly
*/ 6E.[F\u
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package com.tot.count; VCvf'$4(X
import tot.db.DBUtils; ]EG8+K6
import java.sql.*; h.NCG96S
/** >P//]nn
* n^*,JL9@
* @author 0|8cSE<
i
*/ z#GSt
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public class CountControl{ eBY/Y6 R
private static long lastExecuteTime=0;//上次更新时间 7xYz9r)w`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 14*6+~38m&
/** Creates a new instance of CountThread */ E[4
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public CountControl() {} PWkSl
public synchronized void executeUpdate(){ ^Y5I OX:
Connection conn=null; XL'\$f
PreparedStatement ps=null; radP%W-U
try{ #,1z=/d.
conn = DBUtils.getConnection(); 6a_U[-a9;
conn.setAutoCommit(false); KWAd~8,mk
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); EuImj#Zl
for(int i=0;i<CountCache.list.size();i++){ ]@#wR
CountBean cb=(CountBean)CountCache.list.getFirst(); 9)o@d`*
CountCache.list.removeFirst(); 65*Hf3~~
ps.setInt(1, cb.getCountId()); \sfc!5G
ps.executeUpdate();⑴ ^:}C,lIrG
//ps.addBatch();⑵ GIn%yB'
} p
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//int [] counts = ps.executeBatch();⑶ ^S?f"''y3
conn.commit(); K<`W>2"
}catch(Exception e){ @^ *62
e.printStackTrace(); (n7{?`Yid
} finally{ m^3j|'mG
try{ "*N#-=MJF
if(ps!=null) { SJc~E$5<
ps.clearParameters(); vqO#Z
ps.close(); |v5
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ps=null; PAtv#)h
} pV;0Hcy
}catch(SQLException e){} $xq04ejJ
DBUtils.closeConnection(conn); -.ZP<,?@F
} -3azA7tzz
} VmN 7a6a
public long getLast(){ JYA>Q&
return lastExecuteTime; "5O>egt
} Y4swMN8Bq
public void run(){ :FtV~^Z
long now = System.currentTimeMillis(); 3S2Alx!6
if ((now - lastExecuteTime) > executeSep) { D!/ 4u0m
//System.out.print("lastExecuteTime:"+lastExecuteTime); zUZET'Bm9
//System.out.print(" now:"+now+"\n"); '5[(QM5Gi&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); N- knhA
lastExecuteTime=now; r
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executeUpdate(); EzjK{v">
} '@h
else{ 1_v\G
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _z{9V7n4
} q(^iT~}
} _KxR~k^
} I"x|U[*B
//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 /j4G}
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类写好了,下面是在JSP中如下调用。 aX6}:"R2C
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<% >~Tn%u<
CountBean cb=new CountBean(); i8-Y,&>V
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); G/~gF7
CountCache.add(cb); % XZ&(
out.print(CountCache.list.size()+"<br>"); Ol+D"k~<C
CountControl c=new CountControl(); 0)~c)B:5
c.run(); GiEt;8
out.print(CountCache.list.size()+"<br>"); <OKc?[
%>