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: 4# +i\H`
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CountBean.java )?`G"(y
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/* LH}]& >F
* CountData.java '#<4oW\]
* ,J;Cb}
* Created on 2007年1月1日, 下午4:44 @!'rsPrI
* a4d7;~tZ
* To change this template, choose Tools | Options and locate the template under z|Y Ms?
* the Source Creation and Management node. Right-click the template and choose P{m(.EC_
* Open. You can then make changes to the template in the Source Editor. {$>Pg/
*/ 2WO5Af%
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package com.tot.count; r=}v`
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/** =D~>$Y
* <n1panS
* @author `\-<tk9
*/ nh
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public class CountBean { jw5ldC>U
private String countType; 'G>$W+lT^
int countId; i0}f@pCB?X
/** Creates a new instance of CountData */ E.N@qMn~
public CountBean() {} 8sus$:Ry
public void setCountType(String countTypes){ /SW*y@R2l
this.countType=countTypes; Q{[l1:
} 6 2:FlW>
public void setCountId(int countIds){ !jWE^@P/B
this.countId=countIds; s$gR;su)g
} Xb<>AzEM
public String getCountType(){ 7Is:hx|:
return countType; ]9$iUA%Ef
} a^o'KN{
public int getCountId(){ LvqWA}
return countId; )FpizoV q0
} a%nf
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} q0C%">>1#
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CountCache.java @WCA7DW!
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/* FG!2h&k
* CountCache.java nEt{ltsS0
* ;Zm-B]\
* Created on 2007年1月1日, 下午5:01 h6b(FTC^
* H)k V8wU
* To change this template, choose Tools | Options and locate the template under F|a'^:Qs
* the Source Creation and Management node. Right-click the template and choose ID:
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* Open. You can then make changes to the template in the Source Editor. 5pT8 }?7
*/ p'`?CJq8
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package com.tot.count; + 70x0z2
import java.util.*; \Up~"q>Kb
/** b4qMTRnv
* YP
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* @author S6g_$Q7
*/ ?$K.*])e
public class CountCache { eDsB.^|l
public static LinkedList list=new LinkedList(); B[3u,<opFU
/** Creates a new instance of CountCache */ jp;]dyU
public CountCache() {} ?W>`skQ
public static void add(CountBean cb){ }K^v Ujl
if(cb!=null){ @>,GCuPrm
list.add(cb); _\.4ofK(
} .?vHoNvo
} < 1%}8t"
} .07"I7
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CountControl.java G@KDRv
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/* : *XAQb0
* CountThread.java RFLfvD<
* IH&0>a
* Created on 2007年1月1日, 下午4:57 0xx4rpH
* <+-=j
* To change this template, choose Tools | Options and locate the template under n2can
* the Source Creation and Management node. Right-click the template and choose qSGM6kb
* Open. You can then make changes to the template in the Source Editor. ! 1Hs;K
*/ ?fN6_x2e3
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package com.tot.count; mlxtey6H3
import tot.db.DBUtils; k`;d_eW
import java.sql.*; '?jsH+j+
/** tI@aRF=p]2
* iZLy#5(St
* @author '4Jf[
*/ Y7zs)W8xTT
public class CountControl{ l$Vy\CfK3n
private static long lastExecuteTime=0;//上次更新时间 A%2B3@1'q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 HC}vO0X4
/** Creates a new instance of CountThread */ \HIBnkj)3n
public CountControl() {} 1c{m
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public synchronized void executeUpdate(){ }N}Js*
Connection conn=null; p+8o'dl8=
PreparedStatement ps=null; IG{lr
try{ 'A>?aUq]:
conn = DBUtils.getConnection(); zYP6m3n
conn.setAutoCommit(false); }SC&6B?G
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); K&n-(m%
for(int i=0;i<CountCache.list.size();i++){ }L(ZLt8Q
CountBean cb=(CountBean)CountCache.list.getFirst(); Y0Tad?iC
CountCache.list.removeFirst(); Y=4
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ps.setInt(1, cb.getCountId()); Do7 7V5
ps.executeUpdate();⑴ 8k3y"239t
//ps.addBatch();⑵ Wsgp#W+
} q 'd]
//int [] counts = ps.executeBatch();⑶ wAw1K 2d
conn.commit(); .'&pw}F
}catch(Exception e){ c:e3hJ
e.printStackTrace(); I(Qz%/ Ox
} finally{ (uDAdE5
try{ (5@H<c^6
if(ps!=null) { X0iy
ps.clearParameters(); !uoT8BBAk
ps.close(); Z.&/,UU:4
ps=null; ]tXIe?>9
} `<|tC#<z
}catch(SQLException e){} \gA<yz-;N
DBUtils.closeConnection(conn); 0zA;%oP
} >DUTmJxv
} n
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public long getLast(){ 0TaI"/ai
return lastExecuteTime; _
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} n807?FORB
public void run(){ J;NIa[a
long now = System.currentTimeMillis(); KJV8y"^=Q
if ((now - lastExecuteTime) > executeSep) { tT!'qL.*
//System.out.print("lastExecuteTime:"+lastExecuteTime); bZ1*:k2
//System.out.print(" now:"+now+"\n"); 7)]boW~Q
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \I:27:iAL
lastExecuteTime=now; P
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executeUpdate(); Pn^ `_
} pbEWnx_
else{ Ea&NJ]& g
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); JRi:MWR<r
} Pc*lHoVL
} p:TE##
} }ymW};W
//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 Zj!,3{jX^
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类写好了,下面是在JSP中如下调用。 $cIaLq
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<% =y-yHRC7
CountBean cb=new CountBean(); *~g*J^R}
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 1&! i:F#
CountCache.add(cb); "D8WdV(
out.print(CountCache.list.size()+"<br>"); ~CT]&({
CountControl c=new CountControl(); >G8I X^*sG
c.run(); AwXzI;F^
out.print(CountCache.list.size()+"<br>"); L'r&'y[
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