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: ooGM$U
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CountBean.java x-c"%Z|
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/* -j(6;9"7]|
* CountData.java A&{Nh` q
* -Za/p@gM
* Created on 2007年1月1日, 下午4:44 =N@t'fOr
* }]TxlSp!;
* To change this template, choose Tools | Options and locate the template under *hrd5na
* the Source Creation and Management node. Right-click the template and choose V&i;\ 9
* Open. You can then make changes to the template in the Source Editor. CLSK'+l
*/ Xj*Wu_
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package com.tot.count; E`q_bn
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/** 8L XHk l
* :gT4K-Oj
* @author E7hhew
*/ zDp 2g)
public class CountBean { Z)!C'c b
private String countType; J4utIGF
int countId; 6zkaOA46V
/** Creates a new instance of CountData */ B!yr!DWv
public CountBean() {} 3T
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public void setCountType(String countTypes){ -&f$GUTJ
this.countType=countTypes; |{;G2G1[
} q4q6c")zp
public void setCountId(int countIds){ VQI3G
this.countId=countIds; K,]=6Rj
} N [@?gFtT
public String getCountType(){ Vi}_{
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return countType; g`^x@rj`E
} .hiSw
public int getCountId(){ -di o5a
return countId; zT/\Cj68
} Bq>m{
} e)ZUO_Q$
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CountCache.java D$N/FJ8|G
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/* _wcNgFx
* CountCache.java BY*Q_Et
* E4!Fupkpf
* Created on 2007年1月1日, 下午5:01 %\DX#.
* GfG|&VNlz
* To change this template, choose Tools | Options and locate the template under 'S~5"6r
* the Source Creation and Management node. Right-click the template and choose ~
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* Open. You can then make changes to the template in the Source Editor. S'14hk<
*/ Qd6F H2Pl
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package com.tot.count; +V+a4lU14
import java.util.*; /=h` L,
/** zQA`/&=Y
* H"KCK6
* @author OB7hlW
*/ F?cK-.
public class CountCache { }Lv;!
public static LinkedList list=new LinkedList(); 2tLJU Z1
/** Creates a new instance of CountCache */ eQ"E
public CountCache() {} hcc/=_hA
public static void add(CountBean cb){ _U0f=m
if(cb!=null){ 1}37Q&2
list.add(cb); M;NX:mX9
} 6RM/GM
} _6Ha
} 9kojLqCT
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CountControl.java $N\Ja*g
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/* kLY^!
* CountThread.java ca}2TT&t
* -+5>|N#
* Created on 2007年1月1日, 下午4:57 {t!!Uz 7
* Zov~B-Of:
* To change this template, choose Tools | Options and locate the template under &R siVBA
* the Source Creation and Management node. Right-click the template and choose q =Il|Nb>
* Open. You can then make changes to the template in the Source Editor. H[UlY?&+
*/ w*!aZ,P
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package com.tot.count; I|J/F}@p
import tot.db.DBUtils; f-d1KNY
import java.sql.*; |' .
/** h$=2 p5'-
* 8[>zG2
* @author W`&hp6Jq
*/ L(o15
public class CountControl{ e*!kZAf
private static long lastExecuteTime=0;//上次更新时间 V,9cl,z+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3[&C g
/** Creates a new instance of CountThread */ .G^YqJ 4
public CountControl() {} h1{3njdr
public synchronized void executeUpdate(){ ~v83pu1!2s
Connection conn=null; kR9-8I{J
PreparedStatement ps=null; 0Qd:`HF[
try{ >{Tm##@,k
conn = DBUtils.getConnection(); )jC%a6G!
conn.setAutoCommit(false); Ha#>G<;n
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); WKU=.sY
for(int i=0;i<CountCache.list.size();i++){ SB7c.H,
CountBean cb=(CountBean)CountCache.list.getFirst(); >Se,;cB'/]
CountCache.list.removeFirst(); T)CP2U
ps.setInt(1, cb.getCountId()); /@Zrq#o
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ps.executeUpdate();⑴ 8X0z~&
//ps.addBatch();⑵ (ik\|y% A
} >j`qh:^
//int [] counts = ps.executeBatch();⑶ s<Fl p
conn.commit(); Kg$Mx
}catch(Exception e){ `W-Fssu
e.printStackTrace(); N<-Gk6`C/
} finally{
FC*[*
try{ >3_Gw4S*H
if(ps!=null) { BZxvJQ
ps.clearParameters(); fT{Yg /j
ps.close(); m4g$N)
ps=null; L-\GHu~)
} pmilrZmm]
}catch(SQLException e){} \;-|-8Q
DBUtils.closeConnection(conn); 4X$Qu6#i
} -^57oU
} iX\X>W$P
public long getLast(){ d| {r5[&
return lastExecuteTime; g*"P:n71
} ]:f%l
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public void run(){ \L\b $4$d
long now = System.currentTimeMillis(); 0RK!/:'
if ((now - lastExecuteTime) > executeSep) { LK"69Qx?5q
//System.out.print("lastExecuteTime:"+lastExecuteTime); * 4Izy14e
//System.out.print(" now:"+now+"\n"); R$Q.sE
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); p$>l7?h
lastExecuteTime=now; @o6L6Y0Naa
executeUpdate(); T#)P`q
} A9JdU&
else{ ]tDDq=+v
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ~,~eoW7
} k'"%.7$U!
} {GO#.P"
} +{UcspqM
//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 x;')9/3
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类写好了,下面是在JSP中如下调用。 e]tDy0@
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<% 2Gdd*=4z
CountBean cb=new CountBean(); n}V_,:Z
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `KQvJjA6
CountCache.add(cb); TU7'J
out.print(CountCache.list.size()+"<br>"); rt|7h>RQ
CountControl c=new CountControl(); ^KELKv,_
c.run(); &w~d_</
out.print(CountCache.list.size()+"<br>"); FE{FGMq
%>