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:
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CountBean.java s]'EIw}mo
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/* s~g0VNu Y
* CountData.java R@A"U[*
* R>y/Y<5=
* Created on 2007年1月1日, 下午4:44 H*E4+3y
* ..;ep2jSs
* To change this template, choose Tools | Options and locate the template under b<8,'QgB
* the Source Creation and Management node. Right-click the template and choose "pTU&He
* Open. You can then make changes to the template in the Source Editor. ),5|Ves;t[
*/ cg).b?g
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package com.tot.count; ]%ey rbU
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/** Bhg,P.7
* 'h3yxf}\
* @author ?~=5x
*/ K_o[m!:jU
public class CountBean { u5rHQA0%
private String countType; YlJ_$Q[
int countId; Z Is=%6""&
/** Creates a new instance of CountData */ Apbgm[m|{
public CountBean() {} kj/v$m
public void setCountType(String countTypes){ >bbvQb+j
this.countType=countTypes; iCNJ%AZH
} I~)A!vp
public void setCountId(int countIds){ nl+8C}=u
this.countId=countIds; ,KFF[z
} fX{Xw0
public String getCountType(){ f?W" ^6Df
return countType; 5KC
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} l
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public int getCountId(){ aK?PK }@
return countId; $*c!9Etl4
} 4`'V%)M
} ?F/)<r
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CountCache.java M%v 6NxN
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/* > K s.
* CountCache.java b:(t22m#?
* %6cbHH
* Created on 2007年1月1日, 下午5:01 bBgyLyg
* -fT}Nj\
* To change this template, choose Tools | Options and locate the template under OCv,EZ
* the Source Creation and Management node. Right-click the template and choose 3='Kii=LA
* Open. You can then make changes to the template in the Source Editor. eZMfn$McJv
*/ +O!4~k^
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package com.tot.count; +6Ye'IOG
import java.util.*; rbc7CPq_^
/** ;uN&yj<}a
* Zy=DY
* @author d:JP935
*/ 6!Uk c'r
public class CountCache { ()(^B}VK
public static LinkedList list=new LinkedList(); i#:M2&twE
/** Creates a new instance of CountCache */ J!d=aGY0-
public CountCache() {} 9T%b#~?3P
public static void add(CountBean cb){ NKMVp/66D
if(cb!=null){ L!0}&i;u~5
list.add(cb); &}!AjA)
} SlI
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} uxbLoE
} 9=.7[-6i9
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CountControl.java >oL| nwn
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/* =k##*%
* CountThread.java {Lugdf'
* ?eDZ-u9)
* Created on 2007年1月1日, 下午4:57 C=x70Y/
* k|3hs('y|
* To change this template, choose Tools | Options and locate the template under 52.%f+Oa
* the Source Creation and Management node. Right-click the template and choose 349BQ5ND
* Open. You can then make changes to the template in the Source Editor. 9yWSlbPr]
*/ C@!bd+'
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package com.tot.count; _71&".A
import tot.db.DBUtils; Q=t_m(:0
import java.sql.*; cf%aOHYI*
/** E'^ny4gL
* SS!b`
* @author <['ucp
*/ ?\_vqW
public class CountControl{ lY[\eQ
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private static long lastExecuteTime=0;//上次更新时间 Qb8Z+7
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2[i(XG{/
/** Creates a new instance of CountThread */ (&Mv!6]
public CountControl() {} FZtT2Z4&i
public synchronized void executeUpdate(){ L b-xc]
Connection conn=null; wo9`-o6
PreparedStatement ps=null; ;^cMP1SH
try{ tY%T
conn = DBUtils.getConnection(); +2g}wH)l
conn.setAutoCommit(false); SXx4^X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qJ[wVNHh!
for(int i=0;i<CountCache.list.size();i++){ `.3{
CountBean cb=(CountBean)CountCache.list.getFirst(); ;E0x#JUrw
CountCache.list.removeFirst(); {hVc,\A
ps.setInt(1, cb.getCountId()); : eFyd`Syw
ps.executeUpdate();⑴ *Rgl(Ba
//ps.addBatch();⑵ /Nns3oE
} %e+{wU}w?2
//int [] counts = ps.executeBatch();⑶ &(h@]F!
conn.commit(); L~*nI d
}catch(Exception e){ T@mYHKu
e.printStackTrace(); NL &![;
} finally{ %lGT|XrY
try{ t(1gJZs>kX
if(ps!=null) { T'a&
ps.clearParameters(); x\ 8gb#8
ps.close(); zQoJ8i>
ps=null; R~BFZF>:
} _7<G6q2(
}catch(SQLException e){} {EJ+
DBUtils.closeConnection(conn); FTu<$`!1L
} +>Pq]{Uf1j
} j-zWckT{
public long getLast(){ 'j;i4ie>*x
return lastExecuteTime; ?dmwz4k0
} n^` `)"
public void run(){ #r QT)n
long now = System.currentTimeMillis(); ,qj M1xkL$
if ((now - lastExecuteTime) > executeSep) { T;v^BVn
//System.out.print("lastExecuteTime:"+lastExecuteTime); Se|h]+G
//System.out.print(" now:"+now+"\n"); *i V#_
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); FpZ5@
lastExecuteTime=now; +de5y]1H,|
executeUpdate(); >nO[5
} 74a k|(!
else{ M$e$%kPShE
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); WnhH]WY
} Ict+|<f
} \O)u' Bu
} 2{S*$K[M
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 f!G%$?]
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类写好了,下面是在JSP中如下调用。 p1s|JI
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<% ^_/gM[H.
CountBean cb=new CountBean(); YGhHIziI
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); eBqF@'DQ
CountCache.add(cb); 3935cxT1U
out.print(CountCache.list.size()+"<br>"); aT8A+=K6
CountControl c=new CountControl(); 40$9./fe)
c.run(); D0yH2[j+
out.print(CountCache.list.size()+"<br>"); T#a6X;9P
%>