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: q{CD:I:-
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CountBean.java SbXV'&M2AT
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/* & N.]8x5A
* CountData.java 7Q0vwKC8>
* w`I+4&/h
* Created on 2007年1月1日, 下午4:44 iiLDl
* {M
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* To change this template, choose Tools | Options and locate the template under Bg.
* the Source Creation and Management node. Right-click the template and choose Oj8xc!d'
* Open. You can then make changes to the template in the Source Editor. \5P 5N]]
*/ x T1MW
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package com.tot.count; 3Pgld*i7
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/** ac%x\e$
* eZ8DW6 l*
* @author ^TEFKx}PX
*/ szUJh9-
public class CountBean { I3;03X<2
private String countType; LbUH`0:%t
int countId; p`)Mk<`dYD
/** Creates a new instance of CountData */ M3!4,_!~
public CountBean() {} 'l $ViNq;
public void setCountType(String countTypes){ 9Ecc~'f
this.countType=countTypes; pmc)$3u
} ib%'{?Q.
public void setCountId(int countIds){ K1CgM1 v
this.countId=countIds; w0P Atu
} 3R<VpN){
public String getCountType(){ PwnfXsR
return countType; dR!x)oO=
} 1Vx>\A
public int getCountId(){ e/b
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return countId; p]rV\,Yss
} nhy:5eSK
} t~%( Zu>S
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CountCache.java "EBCf.3-
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/* KM9H<;A
* CountCache.java nQ@<[KNd
* 4}-G<7*
* Created on 2007年1月1日, 下午5:01 m:Fdgu9
* x}~Z[ bx
* To change this template, choose Tools | Options and locate the template under :Z.P0=
* the Source Creation and Management node. Right-click the template and choose L| ]fc9W:
* Open. You can then make changes to the template in the Source Editor. 2"EaF^?\
*/ zmFS]IOv$
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package com.tot.count; nCDG PzJ
import java.util.*; 2oo\ SmO]
/** J\hqK*/8
* C:.>*;?7
* @author 4mvnFY}
*/ PkcvUJV
public class CountCache { 7U:{=+oLR
public static LinkedList list=new LinkedList(); \Nj#1G
/** Creates a new instance of CountCache */ *^:s!F
public CountCache() {} %wco)2
public static void add(CountBean cb){ ?Xj@Sx
if(cb!=null){ @$1jp4c
list.add(cb); rP IAu[],g
} nh? JiH
{
} X*M2 O%g`L
} kGu{[Rh
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CountControl.java Mtc -
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/* 63QF1*gPH
* CountThread.java Q@[ (0R1
* CYYo+5x
* Created on 2007年1月1日, 下午4:57 O-ppR7edh
* oG\lejO
* To change this template, choose Tools | Options and locate the template under YB.@zL0.(
* the Source Creation and Management node. Right-click the template and choose ee{K5 G
* Open. You can then make changes to the template in the Source Editor. 1[!7xA0 j
*/ jS)YYk5
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package com.tot.count; =1\mLI}@
import tot.db.DBUtils; ?8FJMFv;4%
import java.sql.*; fo~>y
/** ~Rw][Ys
* k\Y*tY#2
* @author HLPY%VeD
*/ K^IB1U$
public class CountControl{ erOj(ce
private static long lastExecuteTime=0;//上次更新时间 a,h]DkD
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +zK?1llt
/** Creates a new instance of CountThread */ tBVtIOm9
public CountControl() {} K/_"ybR7
public synchronized void executeUpdate(){ 3|%058bF
Connection conn=null; a7aj:.wi
PreparedStatement ps=null; "JE->iD
try{ %~[@5<p
conn = DBUtils.getConnection(); ^ywDa^;-
conn.setAutoCommit(false); uSv]1m_-]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); H.[nr:
for(int i=0;i<CountCache.list.size();i++){ [x'D+!
CountBean cb=(CountBean)CountCache.list.getFirst(); _k#GjAPM
CountCache.list.removeFirst(); Ii!{\p!
ps.setInt(1, cb.getCountId()); bX
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ps.executeUpdate();⑴ a%/D~5Z
//ps.addBatch();⑵ ~=9S AJr]
} Qe_C^(P
//int [] counts = ps.executeBatch();⑶ Rm`P.;%
conn.commit(); TW}].A_-
}catch(Exception e){ 39L_O RMH
e.printStackTrace(); o5:md :\
} finally{ In8{7&iVO
try{ z
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if(ps!=null) { _jH./ @G
ps.clearParameters(); sQ+s3x1y
ps.close(); 0"Zxbgu)
ps=null; ]|u7P{Z"R
} R ^ZOcONd-
}catch(SQLException e){} mY]o_\`
DBUtils.closeConnection(conn); cPkP/3I]h
} S VypR LVB
} G8'
public long getLast(){ ab`9MJc;
return lastExecuteTime; sRZ?Ilua6
} FL b
public void run(){ g _0| `Sm
long now = System.currentTimeMillis(); u8gqWsvruM
if ((now - lastExecuteTime) > executeSep) { 0`Uw[Er&
//System.out.print("lastExecuteTime:"+lastExecuteTime); =Y*@8=V
//System.out.print(" now:"+now+"\n"); "{Hl! Zq/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pu_?)U
lastExecuteTime=now; ]x(6^:D5
executeUpdate(); cj[x%eK>
} NKTy!zWh
else{ +S'm<}"1
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); }z,9!{~`
} TpI8mDO\W
} C-g,uARX(r
} Z<QNzJ D
//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 pH(X;OC9S
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类写好了,下面是在JSP中如下调用。 Jp|eKZ
3!%-O:!
<% E)wf'x
CountBean cb=new CountBean(); ,5j3(Lk
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Q
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CountCache.add(cb);
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out.print(CountCache.list.size()+"<br>"); rjj_]1?K
CountControl c=new CountControl(); ;-_ZWk]
c.run(); 1/i1o nu}
out.print(CountCache.list.size()+"<br>"); gYbcBb%z
%>