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: gzKMGL?%?
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CountBean.java d@a<Eq
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/* j6k"%QHf
* CountData.java ?D)$OCS
* *pnaj\
* Created on 2007年1月1日, 下午4:44 xqY'-Hom
* B@dCCKc%/
* To change this template, choose Tools | Options and locate the template under 6:; >id${
* the Source Creation and Management node. Right-click the template and choose f9kdO&
* Open. You can then make changes to the template in the Source Editor. J}8p}8eF,
*/ ae@!M
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package com.tot.count; HYT~AO-!
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/** =6=:OId
* q I~*G3
* @author Q_iN/F
*/ :wg=H
public class CountBean { LA2/<:
private String countType; P,-5af*;
int countId; /2/aMF(J
/** Creates a new instance of CountData */ ohe[rV>EX
public CountBean() {} 6~W@$SP,F
public void setCountType(String countTypes){ G'w!Aw s
this.countType=countTypes; ;]>)6
} `\;Z&jlpT
public void setCountId(int countIds){ f`/('}t
this.countId=countIds; @0t[7Nv-1
} O
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public String getCountType(){ X9FO"(J
return countType; nIfAG^?|*
} F|5Au>t
public int getCountId(){ oCI\yp@a
return countId; $^?VyHXvY
} p19@to5l
} TKsP#Dt/
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CountCache.java #Y'b?&b
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/* Y[}A4`
* CountCache.java * O?Yp%5NH
* CqZHs
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* Created on 2007年1月1日, 下午5:01 i+~BVb
* 2?Jw0Wq5D
* To change this template, choose Tools | Options and locate the template under </xf4.C
* the Source Creation and Management node. Right-click the template and choose 9=T;Dxn
* Open. You can then make changes to the template in the Source Editor. w4TQ4
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*/ '2<r{
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package com.tot.count; 2;:p
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import java.util.*; m&xVlS
/** u|AMqS
* Zxqlhq/)
* @author Dr%wab"yy
*/ %3#C0%{x
public class CountCache { "Z,T%]
public static LinkedList list=new LinkedList(); l,l6j";ohd
/** Creates a new instance of CountCache */ 6XU p$Pd(
public CountCache() {} BU??}{
public static void add(CountBean cb){ Gs3V]qbEP
if(cb!=null){ 7t<MHdw
list.add(cb); h| wdx(4
} ?#Z4Dg
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} \
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} |#Lz0<c;
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CountControl.java 6<fG;:
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/* ,3f>-mP
* CountThread.java e_KfnPY
* M_ %-A
* Created on 2007年1月1日, 下午4:57 Khc^q*|C)
* gVzIEE25
* To change this template, choose Tools | Options and locate the template under `t)9u^[<(
* the Source Creation and Management node. Right-click the template and choose y'4Qt.1ukN
* Open. You can then make changes to the template in the Source Editor. Q/0gd? U?
*/ nC%qdzT
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package com.tot.count; \'Et)uD*
import tot.db.DBUtils; wW)(mY?
import java.sql.*; +M_ _\7
/** sw$uZ$$~#
* L{8_6s(:
* @author LOfw
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*/ <Ohi+a%6
public class CountControl{ r#)1/`h
private static long lastExecuteTime=0;//上次更新时间 rg >2tgA
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 kln)7SzPuk
/** Creates a new instance of CountThread */ vVa|E#
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public CountControl() {} 5~IdWwG*w
public synchronized void executeUpdate(){ m<>BxX
Connection conn=null; P,'%$DLDg
PreparedStatement ps=null; _\tv ${
try{ I%a-5f$0
conn = DBUtils.getConnection(); AzXLlQ
conn.setAutoCommit(false); ]2)A/fOW
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); j"h/v7~
for(int i=0;i<CountCache.list.size();i++){ [*zg? ur
CountBean cb=(CountBean)CountCache.list.getFirst(); $;q
}jvo
CountCache.list.removeFirst(); $VF,l#aR
ps.setInt(1, cb.getCountId()); [NO4Wzc
ps.executeUpdate();⑴ r=Lgh#9S
//ps.addBatch();⑵ pUqC88*j
} 3s%ND7!/
//int [] counts = ps.executeBatch();⑶ hPBBXj/=
conn.commit(); Sm4BZF~!B
}catch(Exception e){ ]gcOMC
e.printStackTrace(); 9+N%Io?!
} finally{ EXVZ?NG
try{ eU%49 A
if(ps!=null) { _Wg}#r
ps.clearParameters(); 4^2>KC_
ps.close(); Q9O_>mZy
ps=null;
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} a0sz$u
}catch(SQLException e){} !a F~5P7%
DBUtils.closeConnection(conn); V27RK-.N!
} S}%z0g<
} +c<iVc|
public long getLast(){ r \ft{Z<P
return lastExecuteTime; %wOkp`1-
} HFy9b|pjy
public void run(){ 1r$-U h
long now = System.currentTimeMillis(); iUR ij@
if ((now - lastExecuteTime) > executeSep) { YFB>GQ;
//System.out.print("lastExecuteTime:"+lastExecuteTime); }5oI` 9VT
//System.out.print(" now:"+now+"\n"); Uz! 3){E
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); A2M(
ad
lastExecuteTime=now; =#W:z.w
executeUpdate(); b}0h()v
} (
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else{ f2IH2^)P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); #vV]nI<MF.
} _(h=@cv
} rn*'[i?
} *
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 e
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类写好了,下面是在JSP中如下调用。 \M\7k5$
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<% C&w0HoF
CountBean cb=new CountBean(); o(jLirnk
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [%dsq`b#
CountCache.add(cb); tjXg
out.print(CountCache.list.size()+"<br>"); ktTP~7UVi
CountControl c=new CountControl(); aHW34e@ebL
c.run(); zs#-E_^%M
out.print(CountCache.list.size()+"<br>"); e3;D1@
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