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: 8iIp[9~=
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CountBean.java &5W;E+Pub
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/* 3x~7N
* CountData.java P~a@{n*8
* Q(& @ra!{
* Created on 2007年1月1日, 下午4:44 _dKMBcl)E
* 8T1`9ITl:
* To change this template, choose Tools | Options and locate the template under &%2^B[{
* the Source Creation and Management node. Right-click the template and choose |Y3w6 !$
* Open. You can then make changes to the template in the Source Editor. XvI~"}
*/ 6 f*:;
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package com.tot.count; ]0UYxv%]
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/** o GuAF q
* !v8R(
* @author $Cz2b/O
*/ 4R'CLN
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public class CountBean { Ul8HWk[6Iw
private String countType; m.lR]!Y=w
int countId; oJa}NH
/** Creates a new instance of CountData */ #Z1%XCt
public CountBean() {} 505c(+
public void setCountType(String countTypes){ mG~kf]Y
this.countType=countTypes; "rBB&l
} =Kj{wA
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public void setCountId(int countIds){ URb8[~dR:
this.countId=countIds; _=HaE&
} |dR}S!fmG
public String getCountType(){ 3Q,&D'];[
return countType; 'g%:/lwA
} MT!Y!*-5
public int getCountId(){ wUaWF$~y
return countId; #Th)^Is
} 8?Rp2n*o
} y8YsS4E^Q
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CountCache.java Y_CYx
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/* d*8*9CpO:
* CountCache.java ny
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* Z@s[8wrmPl
* Created on 2007年1月1日, 下午5:01 w"{DLN[Qw
* LK} g<!o(
* To change this template, choose Tools | Options and locate the template under 6Z|h>H5a
* the Source Creation and Management node. Right-click the template and choose 3dN`Q:1R9
* Open. You can then make changes to the template in the Source Editor. D$>!vD'
*/ t=B1yvE"
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package com.tot.count; ^6 wWv&G[8
import java.util.*; lie,A
/** ,zgz7
* Ch]d\G M
* @author +zh\W9
*/ ~cc }yDe
public class CountCache { lTC0kh
public static LinkedList list=new LinkedList(); PhyIea
/** Creates a new instance of CountCache */ 35l%iaj]G5
public CountCache() {} BL&AZv/T
public static void add(CountBean cb){ ]W;6gmV
if(cb!=null){ `df!-\#
list.add(cb); 3CD#OCz7&
} ),yar9C
} dFBFXy
} x$q} lJv_
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CountControl.java XP)^81i|
9)wYSz'
/* # Wi?I=,
* CountThread.java ~61b^L}$
* lJ;Wi
* Created on 2007年1月1日, 下午4:57 >@7$=Y>D
* Q/g!h}>(.
* To change this template, choose Tools | Options and locate the template under P")I)>Q6
* the Source Creation and Management node. Right-click the template and choose t*hy"e{*a
* Open. You can then make changes to the template in the Source Editor. lpXGsKH2
*/ ]In7%Qb
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package com.tot.count; z%
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import tot.db.DBUtils; x*H#?.E
import java.sql.*; +j{Cfv$do
/** =!t;e~^8]
* !JXiTI!
* @author ~vz%I^xW
*/ TVNgj.`+u!
public class CountControl{ A,F~*LXm
private static long lastExecuteTime=0;//上次更新时间 qFWN._R
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 pq`uB
/** Creates a new instance of CountThread */ ,NQ!d4~D
public CountControl() {} igo9~.
public synchronized void executeUpdate(){ g
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Connection conn=null; 0h A: =r
PreparedStatement ps=null; =.z;:0]'n
try{ Wxj_DTi[1"
conn = DBUtils.getConnection(); bL
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conn.setAutoCommit(false); %M`48TW)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); "}v.>L<P
for(int i=0;i<CountCache.list.size();i++){ 5QiQDQT}5
CountBean cb=(CountBean)CountCache.list.getFirst(); {.2\}7.c
CountCache.list.removeFirst();
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ps.setInt(1, cb.getCountId()); '^TeV=
ps.executeUpdate();⑴ :EOai%i
//ps.addBatch();⑵ Jw _>I
} 9^F3r]bH
//int [] counts = ps.executeBatch();⑶ qHZDo[
conn.commit(); s|WwBT
}catch(Exception e){ dGp7EB`
e.printStackTrace(); _Z(t**Zh6y
} finally{ "r46Rfa
try{ RiQ]AsTtl
if(ps!=null) { %)7t2D
ps.clearParameters(); HaVhdv3L
ps.close(); wj6u,+
ps=null; Hk*1Wrs*
} e' M&Eh
}catch(SQLException e){} Imv#7{ndq
DBUtils.closeConnection(conn); N" L&Z4Z
} l$&~(YE f
} Os<E7l zqO
public long getLast(){ )I&.6l!#
return lastExecuteTime; ~)f^y!PMQ
} ./ {79
public void run(){ FGi7KV=N
long now = System.currentTimeMillis(); U5kKT.M
if ((now - lastExecuteTime) > executeSep) { ['o ueOg
//System.out.print("lastExecuteTime:"+lastExecuteTime); 94-BcN
//System.out.print(" now:"+now+"\n"); +4-T_m/W/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Nbr$G=U
lastExecuteTime=now; 4fsd5#
executeUpdate(); 'yPKQ/y$x
} 9" q-Bb
else{ hY.i`sp*/
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3q'AgiW
} Ysu\CZGX
} '$OUe {j<
} ^OiL&p;r
//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 fz^j3'!\
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类写好了,下面是在JSP中如下调用。 }T4|Kyu?
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<% M/6Z,oOU
CountBean cb=new CountBean(); 6 ]x?2P%
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ~uc7R/3ss
CountCache.add(cb); 44}5o
out.print(CountCache.list.size()+"<br>"); uj6'T Sl
CountControl c=new CountControl(); aB6xRn9
c.run(); Y]SF0:v!n
out.print(CountCache.list.size()+"<br>"); o*H U^
%>