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: A
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CountBean.java #<!oA1MH4
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/*
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* CountData.java tR2IjvmsX
* (^057
* Created on 2007年1月1日, 下午4:44 *a+~bX)18
* k*lrE4::a
* To change this template, choose Tools | Options and locate the template under odj|"ZK
* the Source Creation and Management node. Right-click the template and choose *4+;Ey
* Open. You can then make changes to the template in the Source Editor. BU])@~$
*/ qFvtqv2
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package com.tot.count; :Fm+X[n
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/** vp-)$f&
* @gs
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* @author sFB; /*C
*/ HM--`RJ
public class CountBean { M[Ls:\1a
private String countType; j7O7P+DmS
int countId; m qtl0P0
/** Creates a new instance of CountData */ w{Dk,9>w)
public CountBean() {} yjN|PqtSV
public void setCountType(String countTypes){ >mh:OJH45
this.countType=countTypes; T`f9jD
} J}<k`af
public void setCountId(int countIds){ .cle^P
this.countId=countIds; 5H?`a7q N
} Q0nSOTQ
public String getCountType(){ ~f){`ZJc
return countType; HiVF<tN
} |\Qr
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public int getCountId(){ :2
return countId; g^8bY=*
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} 0y|}}92:
} Vk>aU3\c
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CountCache.java qTiX;e\W
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/* 8[}MXMRdb
* CountCache.java 4JP01lq'\
* {w{|y[[d~
* Created on 2007年1月1日, 下午5:01 v)J6}H}e
* 0$* z
* To change this template, choose Tools | Options and locate the template under f,PFvT$5e
* the Source Creation and Management node. Right-click the template and choose $NJi]g|<3
* Open. You can then make changes to the template in the Source Editor. k,b(MAiQ0
*/ _.wLQL~y
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package com.tot.count; /koNcpJ
import java.util.*; !L-.bve!
/** (q3(bH~T)
* I)DLnnQQ
* @author O,: en t|
*/ o_os;
public class CountCache { g8}/Ln*W'
public static LinkedList list=new LinkedList(); qFf'RgUtP
/** Creates a new instance of CountCache */ A-.jv
public CountCache() {} [4(TG<I
public static void add(CountBean cb){ rN}{v}n
if(cb!=null){ RR^I*kRH
list.add(cb); =s1"<hH}O)
} hRGK W
} c9iCH~
} ToDN^qE+
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CountControl.java * F~"4g
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/* &bnF{~<\
* CountThread.java Bn47O~
* Qn<J@%
* Created on 2007年1月1日, 下午4:57 [-1Nn}
* "YHe]R>3s
* To change this template, choose Tools | Options and locate the template under 7P:0XML}
* the Source Creation and Management node. Right-click the template and choose Yq<D(F#qx
* Open. You can then make changes to the template in the Source Editor. -twIF49
*/ 8R8J./i.K
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package com.tot.count; 42tD$S5^
import tot.db.DBUtils; <k}>eGn
import java.sql.*; D
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/** t`H^!
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* b
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* @author GEIMCg(TRj
*/ $U"/.Mh\
public class CountControl{ b"x;i\Z0%
private static long lastExecuteTime=0;//上次更新时间 "t`r_Aw
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 "uqa~R{
/** Creates a new instance of CountThread */ kzgHp,;R{
public CountControl() {} )v8;\1`s:
public synchronized void executeUpdate(){ pg*'2AT
Connection conn=null; #C4
PreparedStatement ps=null; 0>VgO{X
try{ 9=
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conn = DBUtils.getConnection(); xWn.vSos
conn.setAutoCommit(false); $9Y2\'w<h6
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ANn{*h
for(int i=0;i<CountCache.list.size();i++){ Zdj~B1
CountBean cb=(CountBean)CountCache.list.getFirst(); `H^Nc\P#
CountCache.list.removeFirst(); DQH _@-q
ps.setInt(1, cb.getCountId()); hG&RGN_<6+
ps.executeUpdate();⑴ 2%1g%
//ps.addBatch();⑵ !W]># Pm
} G:A~nv9
//int [] counts = ps.executeBatch();⑶ q.~.1
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conn.commit(); dg/7?gV
}catch(Exception e){ JB''Ujyi
e.printStackTrace(); 9v0.]
} finally{ c*MjBAq
try{ FbWkT4t|
if(ps!=null) { _N9yC\
ps.clearParameters(); ,t61IU3"
ps.close(); ]Fl+^aLS
ps=null; j\!zz
}
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}catch(SQLException e){} : gv[X
DBUtils.closeConnection(conn); m!N_TOl-^
} H,KU!1p
} (fm\kV
public long getLast(){ xgsD<3
return lastExecuteTime; bq<QUw=]q&
} .l !:|Fd
public void run(){ D\N-ye1LE
long now = System.currentTimeMillis(); SECL(@0(^
if ((now - lastExecuteTime) > executeSep) { BAdHGwomh
//System.out.print("lastExecuteTime:"+lastExecuteTime); f(?>z!n0
//System.out.print(" now:"+now+"\n"); "{qhk{
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); p^ 9QYR
lastExecuteTime=now; ;oWh Tj`
executeUpdate(); o9q%=/@,
} sB-c'`,w`
else{ n*@^c$&P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /o+,
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} _BtppQIWv
} {5^'u^E
} /$&~0pk
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 a%*W^R9Ls
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类写好了,下面是在JSP中如下调用。 )'DFDrY
</:f-J%U/
<% vlp]!7v
CountBean cb=new CountBean(); PIB|&I|p
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); A$Es(<'9g
CountCache.add(cb); V4/P
out.print(CountCache.list.size()+"<br>"); `Ft`8=(
CountControl c=new CountControl(); =lr*zeHLC
c.run(); i*W8_C:S
out.print(CountCache.list.size()+"<br>"); w v9s{I{P
%>