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: n3(HA
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CountBean.java .MKxHM7
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/* [(C lvGx
* CountData.java
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* w^~,M3(+)1
* Created on 2007年1月1日, 下午4:44 =6Z1yw7s
* [lf[J&}X
* To change this template, choose Tools | Options and locate the template under |
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* the Source Creation and Management node. Right-click the template and choose wegBMRQVp
* Open. You can then make changes to the template in the Source Editor. zIu1oF4[
*/ H_{Yr+p
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package com.tot.count; FX{Sb"
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/** aa|xZ
* %EuSP0
* @author `!i>fo~
*/ J? C"be=
public class CountBean { K$4Ky&89
private String countType; Ae"B]Cxb_X
int countId; ]]+"`t,-
/** Creates a new instance of CountData */ O?@AnkOhn
public CountBean() {} R8HFyP
public void setCountType(String countTypes){ 8qT/1b
this.countType=countTypes; .L}ar7
} WaYT\CG7y
public void setCountId(int countIds){ zQ6otDZx
this.countId=countIds; k]Yd4CC2
} E11"uWk`
public String getCountType(){ CGQ`i
return countType; %
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} k3&Wv
public int getCountId(){ \n}cx~j
return countId; K#>B'>A\
} gD-<^Q-
} xu3qX"
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CountCache.java #<{sP0v*
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/* +BESO
* CountCache.java Lx.X#n.]T
* ~MOIrF
* Created on 2007年1月1日, 下午5:01 -0Ps.B
* '2eggX%
* To change this template, choose Tools | Options and locate the template under O[!]/qP+.
* the Source Creation and Management node. Right-click the template and choose 4g|}]K1s
* Open. You can then make changes to the template in the Source Editor. FbF P
*/ WHL@]^E@m
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package com.tot.count; |1#*`2j\=9
import java.util.*; sq_
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/** OF}vY0oiw?
* zMtx>VI
* @author LKhUqW
*/ q%nWBmPZ~y
public class CountCache { BRzrtK
public static LinkedList list=new LinkedList(); 7"1M3P5*8
/** Creates a new instance of CountCache */ gkDB8,C<j
public CountCache() {} f|u!?NGl
public static void add(CountBean cb){
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if(cb!=null){ {D$+~lO
list.add(cb); 8RB\P:6h
} hDCR>G
} |Gz(q4
} ~OXPn9qPp
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CountControl.java }}<^fM
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/* WOh?/F[@u
* CountThread.java J%{>I
* Y-v6xUc{F
* Created on 2007年1月1日, 下午4:57 (m13
ong
* ^)TZHc2a[
* To change this template, choose Tools | Options and locate the template under DKR2b`J
* the Source Creation and Management node. Right-click the template and choose Yf1?3(0O
* Open. You can then make changes to the template in the Source Editor. >o.4sN@
*/ T< D&%)
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package com.tot.count; XsEDI?p2
import tot.db.DBUtils; ? g}G#j
import java.sql.*; ,VI2dNst\
/** 6YNd;,it>p
* L\aG.\
* @author voiWf?X
*/ 5y0N }}
public class CountControl{ wZ0RI{)s'
private static long lastExecuteTime=0;//上次更新时间 X3@Uih}|
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `fS$@{YI_
/** Creates a new instance of CountThread */ ]@0C1r
public CountControl() {} )1N~-VuT
public synchronized void executeUpdate(){ y2KR^/LN|Y
Connection conn=null; 7*.nd
PreparedStatement ps=null; h:xvnyaI
try{ <v%Q|r
conn = DBUtils.getConnection(); 0-6rIdDTM
conn.setAutoCommit(false); /V0[Urc@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Fsz;T;
for(int i=0;i<CountCache.list.size();i++){ 6o6I]QL
CountBean cb=(CountBean)CountCache.list.getFirst(); MR}=tO
CountCache.list.removeFirst(); ~7ZWtg;B
ps.setInt(1, cb.getCountId()); x. 8fxogz
ps.executeUpdate();⑴ VX0}x+LJ
//ps.addBatch();⑵ L xP%o
} Y'*oW+K
//int [] counts = ps.executeBatch();⑶ FN\*x:g
conn.commit(); Xh+;$2l.B
}catch(Exception e){ QWcQtM
e.printStackTrace(); xPCRT*Pd
} finally{ T\q:
try{ A`71L V%
if(ps!=null) { >P@g].Q-
ps.clearParameters(); a5caryZ"z
ps.close(); r'8qZJgm
ps=null; gamE^Ee
} 5X&Y~w,poU
}catch(SQLException e){} 2u Zb2O
DBUtils.closeConnection(conn); a@!(o )>
} cDS\=Bf
} 52ExRG S
public long getLast(){ 0Xb,ne
7
return lastExecuteTime; >e^bq/'
} 6dgwsl~
public void run(){ y*=sboX
long now = System.currentTimeMillis(); 7vTzY%v
if ((now - lastExecuteTime) > executeSep) { HA$Xg
j
//System.out.print("lastExecuteTime:"+lastExecuteTime); %:t! u&:q
//System.out.print(" now:"+now+"\n"); j<'ftKk
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); fJOwE
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lastExecuteTime=now; b+1!qNuCW#
executeUpdate(); 1%ENgb:8
} (@m/j2z
else{ H-\Ym}BGu
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !#d5hjoX
} ^hNl6)hR
} 8yk7d76Y
} 1_WP\@O
//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 {8>g?4Q#
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类写好了,下面是在JSP中如下调用。 y4U|~\]
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<% ncqAof(/
CountBean cb=new CountBean(); oR7[[H.4
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ,?P< =M
CountCache.add(cb); bmu] zJ
out.print(CountCache.list.size()+"<br>"); _o[fjd
CountControl c=new CountControl(); pT{is.RM
c.run(); :{+~i.*
out.print(CountCache.list.size()+"<br>"); ^hXm=r4ozR
%>