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: X|damI%
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CountBean.java p]V-<
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/* &X]=Qpl
* CountData.java ,4>WLJDo
* /Xu;/MMpd3
* Created on 2007年1月1日, 下午4:44 Z:o
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*
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* To change this template, choose Tools | Options and locate the template under 2.Eu+*UC
* the Source Creation and Management node. Right-click the template and choose kJvy<(iG
* Open. You can then make changes to the template in the Source Editor. ngkeJ)M0$
*/ '^F|k`$r
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package com.tot.count; Zn<(,e
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/** 4j@kMe;RjZ
* ySuLt@X
* @author zA'gb'MmW
*/ [zh4W*K_cq
public class CountBean { @RoRNat
private String countType; 0(hv #C4
int countId; L VU)W^
/** Creates a new instance of CountData */ n<%=~1iY+
public CountBean() {} *t?~)o7
public void setCountType(String countTypes){ wKi}@|0[@
this.countType=countTypes; }KD7 Y
} }[KDE{,V
public void setCountId(int countIds){ 6&
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this.countId=countIds; Pi"~/MGP$
} iFwyh`Bcg
public String getCountType(){ YM`:L
return countType; #GY&$8.u*
} 38*'8=Y#>
public int getCountId(){ p'Y&Z?8
return countId; '?`@7Eol
} u1pc5 Y{
} \=EY@*=
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CountCache.java u>t|X}JH
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/* ;o_V!<$
* CountCache.java 43{_Y]
* PQU3s$
* Created on 2007年1月1日, 下午5:01 w;yiX<t<
* rF8W(E_=
* To change this template, choose Tools | Options and locate the template under xqQ~|
* the Source Creation and Management node. Right-click the template and choose %0+h
* Open. You can then make changes to the template in the Source Editor. <=)D=Ax/_[
*/ 3XAp Y'
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package com.tot.count; g:uvoMUD
import java.util.*; WbC0H78]
/** 9zoT6QP4
* -TK|Y"
* @author {8!ZKlB
*/ {?@t/.4[W3
public class CountCache { F=-uDtQ<N
public static LinkedList list=new LinkedList(); TbKP8zw{
/** Creates a new instance of CountCache */ O?nPxa<
public CountCache() {} H)`C ncB
public static void add(CountBean cb){ ;gxN@%}@
if(cb!=null){ KrdZEi vb
list.add(cb); VjA wn}eO
} IdV,%d{
} (C-,ljY
} >-_:*/66!
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CountControl.java 9*}iBs
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/* e5qrQwU
* CountThread.java ill-%OPeg
* {h/OnBwG
* Created on 2007年1月1日, 下午4:57 %XEKhy
* 0On?{Bw
* To change this template, choose Tools | Options and locate the template under !G)mjvEe
* the Source Creation and Management node. Right-click the template and choose /~o7Q$)-b
* Open. You can then make changes to the template in the Source Editor. `y8
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*/ ~")hE%Kl}
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package com.tot.count;
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import tot.db.DBUtils; 5cyddlaat
import java.sql.*; ZNzR`6}
/**
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* &\;<t,3A~
* @author T[5gom
*/ P &;y]
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public class CountControl{ 7ei>L]gm%
private static long lastExecuteTime=0;//上次更新时间 Q!4i_)rM
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ${A5-
/** Creates a new instance of CountThread */ G0_&gx`
public CountControl() {} ,{.zh&=4
public synchronized void executeUpdate(){ U0NOU#
Connection conn=null; :V&N\>Wo
PreparedStatement ps=null; [D*J[?yt
try{ +3M$3w{2
conn = DBUtils.getConnection(); eV[`P&j_C
conn.setAutoCommit(false); P'a0CE%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Wmz q
for(int i=0;i<CountCache.list.size();i++){ !1ML%}vvB,
CountBean cb=(CountBean)CountCache.list.getFirst(); t{/hkXq]
CountCache.list.removeFirst(); ,sO:$
ps.setInt(1, cb.getCountId()); (H&@u9K?a?
ps.executeUpdate();⑴ [<]Y+33
//ps.addBatch();⑵ 1vB-M6(
} eq^TA1>T
//int [] counts = ps.executeBatch();⑶ ybo#K
conn.commit(); YniZ(
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}catch(Exception e){ |ZS 57c:
e.printStackTrace(); 7%{R#$F
} finally{ Hze-Ob8
try{ G 6Wx3~
if(ps!=null) { ( MB`hk-d
ps.clearParameters(); M
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ps.close(); o .l;:
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ps=null; p]wP36<S!
} /SnynZ.q
}catch(SQLException e){} .
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DBUtils.closeConnection(conn); Dc5bkm
} lkV6qIj
} ,VPbUo@
public long getLast(){ +p13xc?#j
return lastExecuteTime; -G8c5b[
} VBu8}}Ql
public void run(){ z)5S^{(
long now = System.currentTimeMillis(); wb]*u7G
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if ((now - lastExecuteTime) > executeSep) { aGpCNc{+
//System.out.print("lastExecuteTime:"+lastExecuteTime); Hl4\M]]/&
//System.out.print(" now:"+now+"\n"); ddoST``G
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); HV ;;
lastExecuteTime=now; D,MyI#
executeUpdate(); Ej'
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} *Wzwbwg
else{ h2"9"*S1
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); -g:lOht
} DKh}Y
!Q=:
} A^pu
} 1<`9HCm
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 w|=gSC-o
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类写好了,下面是在JSP中如下调用。 6MuWlCKF8
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<% ,*7H|de7
CountBean cb=new CountBean(); Am=wEu[b
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \@i=)dA
CountCache.add(cb); =K:(&6f<t
out.print(CountCache.list.size()+"<br>"); \ZS\i4
CountControl c=new CountControl(); w TlGJ$D0
c.run(); sYI~dU2H
out.print(CountCache.list.size()+"<br>"); QjLji+L
%>