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: /u8m|S<
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CountBean.java qJN2\e2~f
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/* z\8Kz ]n~
* CountData.java F\Gi;6a
* :)\<
* Created on 2007年1月1日, 下午4:44 $>;U^- #3
* tQ:)j^\
* To change this template, choose Tools | Options and locate the template under Ln})\
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* the Source Creation and Management node. Right-click the template and choose s^b2H
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* Open. You can then make changes to the template in the Source Editor. /gKX%`ZF/r
*/ !(soMv
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package com.tot.count; x\Bl^1&
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/** 39QAj&
* G.,dP+i
* @author :.IVf Zw
*/ VMUK|pC4K
public class CountBean { mRw &^7r
private String countType; h$FpH\-
int countId; Uzb~L_\Rmt
/** Creates a new instance of CountData */ nxP>IfSA
public CountBean() {} d3#
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public void setCountType(String countTypes){ eEIa=MB*
this.countType=countTypes; sV+/JDl
} !K#Q[Ee
public void setCountId(int countIds){ brGUK PB
this.countId=countIds; ([='LyH];z
} jd|? aK;(
public String getCountType(){ PG8|w[V1 "
return countType; I_IDrS)O
} 5uuZ t0V\
public int getCountId(){ D}wM$B@S
return countId; 8M;VX3X
} G _{x)@
} p*8LS7UT
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CountCache.java |~Hlv^6H
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/* |"vUC/R2&
* CountCache.java #N?EPV$
* xZ }1dq8
* Created on 2007年1月1日, 下午5:01 +^
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* j^}p'w Tu{
* To change this template, choose Tools | Options and locate the template under pDO&I]S`q0
* the Source Creation and Management node. Right-click the template and choose (5] |Kcp|
* Open. You can then make changes to the template in the Source Editor. jemg#GB8
*/ e.%`
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package com.tot.count; `w1|(Sk$h
import java.util.*; vd>X4e^j
/** ]?p&sI4
* G%w hOIFRq
* @author 0!YB.=\{_q
*/ _4VF>#b
public class CountCache { "If]qX(w
public static LinkedList list=new LinkedList(); ixZ w;+h
/** Creates a new instance of CountCache */ A"8`5qa
public CountCache() {} ,c#=qb8""
public static void add(CountBean cb){ uI^E9r/hB
if(cb!=null){ ;H5PiSq;z
list.add(cb); qh!2dj
} Np=IZnpt
} lV/-jkR
} 6C>"H
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CountControl.java P)Vm4u
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/* pJ7M.C!
* CountThread.java ."<mL}Fi(
* >
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* Created on 2007年1月1日, 下午4:57 ]4 2bd
* u/3 4E=
* To change this template, choose Tools | Options and locate the template under C~F do0D
* the Source Creation and Management node. Right-click the template and choose p}%T`e=Z9
* Open. You can then make changes to the template in the Source Editor. 01VEz
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*/ hiWfVz{~
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package com.tot.count; 2yk32|
import tot.db.DBUtils; 6vySOVMj
import java.sql.*; :!a'N3o>
/** 8{aS$V"
* I^*&u,
* @author z;GR(;w/
*/ c`94a SnV
public class CountControl{ )#
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private static long lastExecuteTime=0;//上次更新时间 pZ?7'+u$L
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 N6Mo|
/** Creates a new instance of CountThread */ :uE:mY%R
public CountControl() {} #'N"<o[
public synchronized void executeUpdate(){ <QoSq'g#,=
Connection conn=null; #gzY _)E
PreparedStatement ps=null; IKx]?0sS
try{ / E~)xgPM<
conn = DBUtils.getConnection(); =c
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conn.setAutoCommit(false); L P?E
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); .'QE o
for(int i=0;i<CountCache.list.size();i++){ :feU
CountBean cb=(CountBean)CountCache.list.getFirst(); XLe8]y=
CountCache.list.removeFirst(); ##~";j
ps.setInt(1, cb.getCountId()); Fdsaf[3[v
ps.executeUpdate();⑴
'k[O?}
//ps.addBatch();⑵ spIkXEK
} GMqeC
//int [] counts = ps.executeBatch();⑶ Ffxf!zS
conn.commit(); X_yAx)Do
}catch(Exception e){ TxL;qZRY
^
e.printStackTrace(); ;fLYO6
} finally{ }!=}g|z#|
try{ R0dIxG%
if(ps!=null) { q 65mR!)
ps.clearParameters(); "L'0"
ps.close(); v0762w
ps=null; $I40 hk
} 8zv=@`4@G
}catch(SQLException e){} }}Gz3>?24=
DBUtils.closeConnection(conn); ^V]DQ%v"I
} #w\Bc\
} d4OWnPHv&}
public long getLast(){ ck-ab0n
return lastExecuteTime; @Sb 86Ee
}
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public void run(){ i7g+8zd8d
long now = System.currentTimeMillis(); bvY'=
if ((now - lastExecuteTime) > executeSep) { !QK~l
//System.out.print("lastExecuteTime:"+lastExecuteTime); *7.EL`8
//System.out.print(" now:"+now+"\n"); 5ve4 u
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); <xOv0B
lastExecuteTime=now; T~B'- >O
executeUpdate(); ^fVLM>p <;
} N|cWTbi
else{ ,MkldCV
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); K:Mm?28s
} P|mV((/m4
} @]$qJFXx
} "vVL52HwB
//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 %n<u- {`
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类写好了,下面是在JSP中如下调用。 Q"UWh~
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<% $6\-8zNk
CountBean cb=new CountBean(); ;4DqtR"7Y
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); .yp"6S^b
CountCache.add(cb); |BrD:+
out.print(CountCache.list.size()+"<br>"); Y{yN*9a79
CountControl c=new CountControl(); =Kdd+g!
c.run(); Z]-C,8MM
out.print(CountCache.list.size()+"<br>"); NPjh2 AJm
%>