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: `:eViVl6e
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CountBean.java A, PlvI
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/* +]@Az.E
* CountData.java lI/0:|l
* 7DfTfTU6
* Created on 2007年1月1日, 下午4:44 "W#t;;9Wz
* aRc '
* To change this template, choose Tools | Options and locate the template under ) ){xlFA}
* the Source Creation and Management node. Right-click the template and choose H\GkW6
* Open. You can then make changes to the template in the Source Editor. |Cdvfk
*/ Kwhdu<6
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package com.tot.count; o."rxd
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/** 2Nj9U#A
* 8:.nEo'
* @author e2C<PGUUB
*/ WM)F0@"
public class CountBean { #2tCV't
private String countType; i\H+X
int countId; XTDE53Js&
/** Creates a new instance of CountData */ ;p ]y)3
public CountBean() {} w&BGJYI
public void setCountType(String countTypes){ E&B{5/rv
this.countType=countTypes;
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} SjdZyJa
public void setCountId(int countIds){ R1-k3;v^
this.countId=countIds; J@9}`y=K
} ~^vC,]hU
public String getCountType(){ ? &zQaxD
return countType; T#O??3/%$1
} jvVi%k
public int getCountId(){ $A}QY5`+~S
return countId; !eJCM`cp
} jFerYv&K~
} )nu~9km3
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CountCache.java ^\:2}4Uj_
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/* Z7jX9e"L
* CountCache.java o;[bJ
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* uvA(Rn
* Created on 2007年1月1日, 下午5:01 PzY)"]g
* [^~7]2 i
* To change this template, choose Tools | Options and locate the template under eu'1H@vX(
* the Source Creation and Management node. Right-click the template and choose Bfd-:`Jk
* Open. You can then make changes to the template in the Source Editor. j|e[s ?d
*/ QT#6'>&7-b
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package com.tot.count; wE).>
import java.util.*; x"(9II*
/** T ^JuZG
* ^t[HoFRa
* @author +dkS/b
*/ ?G?gy2
public class CountCache { l
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public static LinkedList list=new LinkedList(); Gowp
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/** Creates a new instance of CountCache */ PG,U6c #
public CountCache() {} D{'#er
public static void add(CountBean cb){ &HM-g7|C0E
if(cb!=null){ 4%*hGh=
list.add(cb); /!Z^Y
} eFTX6XB:i
} 6(sIYZ2yq
} 83.E0@$
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CountControl.java ~DLIz g7p!
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/* !k~z5z'=py
* CountThread.java zzvlI66e
* AV @\ +0
* Created on 2007年1月1日, 下午4:57 %B EC]
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* 9e<Zgr?N
* To change this template, choose Tools | Options and locate the template under ][Y^-Ak1
* the Source Creation and Management node. Right-click the template and choose 7SI)1_%G
* Open. You can then make changes to the template in the Source Editor. ke/_k/
*/ W'_/6_c$!
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package com.tot.count; Su8'$CFz$.
import tot.db.DBUtils; f|xLKcOP
import java.sql.*; C]`eH*z~8
/** /hdf{4
* 4FA|[An
* @author J-J3=JG
*/ T{*^_
public class CountControl{ WfGH|u
private static long lastExecuteTime=0;//上次更新时间 lv:U%+A
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Fc0jQ@4=
/** Creates a new instance of CountThread */ pH9HK
public CountControl() {} h'^FrWaU/
public synchronized void executeUpdate(){ ZHy><=2
Connection conn=null; ?gV'(3
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PreparedStatement ps=null; !=[uT+v
try{ Z|^MGyn
conn = DBUtils.getConnection(); CKTrZxR"
conn.setAutoCommit(false); qmmv7==
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); BV9 *s
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); =cfm=+
CountCache.list.removeFirst(); 0->/`/xm
ps.setInt(1, cb.getCountId()); D6!t VdnVe
ps.executeUpdate();⑴ jXEGSn
//ps.addBatch();⑵ I$N7pobh
} k]I*:'178
//int [] counts = ps.executeBatch();⑶ sT<{SmBF
conn.commit(); E_[ONm=,
}catch(Exception e){ R @r{
e.printStackTrace(); g'G8 3F
} finally{ 3kLOoL?
try{ - s|t^
if(ps!=null) { ~eo^`4O{{
ps.clearParameters(); @
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ps.close(); ZBj6KqfST%
ps=null; Js}tZ\+P75
} Ea`OT+#h(*
}catch(SQLException e){} i
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DBUtils.closeConnection(conn); ",Wf uz
} U5rxt^
} 0]a1 5
public long getLast(){ u~71l)LA
return lastExecuteTime; 'P/taEi=R
} a!.!2a&t
public void run(){ spiDm:Xe
long now = System.currentTimeMillis(); P$h;SK
if ((now - lastExecuteTime) > executeSep) { -fM1$/]
//System.out.print("lastExecuteTime:"+lastExecuteTime); }W
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//System.out.print(" now:"+now+"\n"); hCLk#_
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); TczXHT}G
lastExecuteTime=now; 3@X|Gs'_S
executeUpdate(); %)IrXz>Zh
} mcMb*?]
else{ A*Q[k 9B
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
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} zjoo{IH}
} 4? {*(
} -~'kP /E^
//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 a97Csxf;7
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类写好了,下面是在JSP中如下调用。
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<% ocP*\NR
CountBean cb=new CountBean(); ~}%&p&
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); NhtEW0xCr
CountCache.add(cb); J_/05(48
out.print(CountCache.list.size()+"<br>"); %EB;1
CountControl c=new CountControl(); 0HPO"x3-O
c.run(); l-=e62I{=|
out.print(CountCache.list.size()+"<br>"); E<a.LW@
%>