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: W7PL]5y&
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CountBean.java <Mq vGXI
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/* V }?MP-.c
* CountData.java h%*@82DKK
* (Q4hm ]<
* Created on 2007年1月1日, 下午4:44 XGCjB{IV
* "!F%X%/
* To change this template, choose Tools | Options and locate the template under 818,E
* the Source Creation and Management node. Right-click the template and choose 9z9\pXFQ
* Open. You can then make changes to the template in the Source Editor. &Fg|52
*/ j2GTo~muq
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package com.tot.count; XTro;R=#
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/** 49?wEm#
* BJNZH# "
* @author J\%SAit@
*/ ;rqW?':(i
public class CountBean { 9m+ejTK{U
private String countType; dWK"Tkf\
int countId; e\7AtlW"
/** Creates a new instance of CountData */ y`Nprwb
public CountBean() {} 2P(6R.8;6
public void setCountType(String countTypes){ LyuA("xB#
this.countType=countTypes; &`^PO$
} qvs&*lBY
public void setCountId(int countIds){ > f*-9
this.countId=countIds; RoLN#
} 089 <B& <
public String getCountType(){ ]p-xds#d
return countType; w}WfQj
} =v:}{~M^$
public int getCountId(){ vXLGdv::
return countId; Mc@_[q!xY?
} kuI$VC
} JUpb*B_z
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CountCache.java vKFEA7
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/* ;#XF.l,u
* CountCache.java Z(Z$>P&4
* >.1d1#+b
* Created on 2007年1月1日, 下午5:01 9~5LKg7Ac
* Tf{lH9ca$
* To change this template, choose Tools | Options and locate the template under o#\c:D*k
* the Source Creation and Management node. Right-click the template and choose %u!)1oOIz
* Open. You can then make changes to the template in the Source Editor. nIEIb.-
*/ 4L _AhX7
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package com.tot.count; ym;I(TC+
import java.util.*; I1 +A$<Fa
/** #\l#f8(l
* pJo#7rxd6
* @author [O@U@bD9
*/ | <bZ*7G
public class CountCache { E@J}(76VS
public static LinkedList list=new LinkedList(); 8O| w(z
/** Creates a new instance of CountCache */ =v(&qh9Q2
public CountCache() {} 9l<}`/@}W
public static void add(CountBean cb){ k!0vpps
if(cb!=null){ fJK;[*&Y
list.add(cb); ;;}}uW=
} #B6$r/%
} 8'-E>+L
} KSve_CBOh
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CountControl.java 2UeK%-~W?
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/* XES$V15
* CountThread.java 2=
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* J 7HOSFwXn
* Created on 2007年1月1日, 下午4:57 95.s,'0
* eHc.#OA&
* To change this template, choose Tools | Options and locate the template under t; b1<TLn0
* the Source Creation and Management node. Right-click the template and choose 5;CqGzgoP
* Open. You can then make changes to the template in the Source Editor. Z\S'HNU
*/ #Fckev4
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package com.tot.count; jP31K{G?
import tot.db.DBUtils; (gEz<}Av.
import java.sql.*; ,8)aKy
/** zEk/#&
* 7?]wAH89
* @author Z5`U+ (
*/ S;}/ql y
public class CountControl{ @@5JuI-!
private static long lastExecuteTime=0;//上次更新时间 xMA2S*%ca
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 nn8uFISb
/** Creates a new instance of CountThread */ 7b*9
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public CountControl() {} ,veo/k<"r8
public synchronized void executeUpdate(){ bW2Msv/H
Connection conn=null; ]T>|Y0 |
PreparedStatement ps=null; LM*m>n*
try{ |]'gd)%S\
conn = DBUtils.getConnection(); H><!
C
conn.setAutoCommit(false); 5|g#>sx>`q
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); hY/i)T{
for(int i=0;i<CountCache.list.size();i++){ !|-:"hE1h
CountBean cb=(CountBean)CountCache.list.getFirst(); *fp4u_:`
CountCache.list.removeFirst(); tN_~zP
ps.setInt(1, cb.getCountId()); "u3 N9
ps.executeUpdate();⑴ &GaI
//ps.addBatch();⑵ v%)=!T,
} , L5.KwB
//int [] counts = ps.executeBatch();⑶ ]D@y""{--s
conn.commit(); D6:"k
2
}catch(Exception e){ ]ZS/9 $
e.printStackTrace(); P,bis7X.
} finally{ 1i
7p'
try{ IFkU8EK&B
if(ps!=null) { _/5xtupxE
ps.clearParameters(); ,A9{x\1!
ps.close(); l<p6zD$l
ps=null; &t@|/~%[
} t<yOTVah
}catch(SQLException e){} 6Z!OD(/e
DBUtils.closeConnection(conn); /'L/O;H20
} P`y 0FKS
} I{7Hz{
public long getLast(){ `r+`vJ$
return lastExecuteTime; ]64?S0p1c!
} Q@-
h
public void run(){ EoOwu-{
long now = System.currentTimeMillis(); ;|.IUXEgcF
if ((now - lastExecuteTime) > executeSep) { V&>mD"~MP
//System.out.print("lastExecuteTime:"+lastExecuteTime); "FXT8Qxg
//System.out.print(" now:"+now+"\n"); '_%`0p1
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); =%0r_#F%=
lastExecuteTime=now; 3M[5_OK
executeUpdate(); rlSflcK\\(
} ol@LLT_m
else{ TN.&FDqC9
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); N=;VS-
} YA@OA$`E
} 6@J)kV
} $jN,]N~
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 F17nWvF
0[!38
类写好了,下面是在JSP中如下调用。 ''wF%q
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<% gro@+^DmT
CountBean cb=new CountBean(); +$D~?sk
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); f/]g@/`
CountCache.add(cb); qj<_*
out.print(CountCache.list.size()+"<br>"); |^t8ct?x~
CountControl c=new CountControl(); T0lbMp
c.run(); Q);^gV
out.print(CountCache.list.size()+"<br>"); /Avl&Rd
%>