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: hsE!3[[
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CountBean.java ^2??]R&Q
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/* KcU,RTE
* CountData.java =;{S>P!I(t
* Z9sg6M@s
* Created on 2007年1月1日, 下午4:44 }%1E9u
* %d7iQZb>
* To change this template, choose Tools | Options and locate the template under ZbGyl}8ua
* the Source Creation and Management node. Right-click the template and choose WWe.1A,
* Open. You can then make changes to the template in the Source Editor. Ka{Iue Ss
*/ FCe503qND$
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package com.tot.count; X!
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/** ry<
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* I&xRK'
* @author Qxvz}r.l]
*/ 16+@#d%#p
public class CountBean { @KpzxcEoO
private String countType; l1:j/[B=
int countId; /.?\P#9)
/** Creates a new instance of CountData */ DuE>KX{<!R
public CountBean() {} )3
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public void setCountType(String countTypes){ d}=p-s.GA
this.countType=countTypes; zm}1~A
} evs2dz<eA
public void setCountId(int countIds){ -( iJ<
this.countId=countIds; p>zE/Pw~
} g<C})84y3
public String getCountType(){ z]WT>4
return countType; + mcN6/
} 2
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public int getCountId(){ oD 8-I^
return countId; 5cADC`q
} wTW"1M
}
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CountCache.java .Sn1YAhE
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/* VO`A
* CountCache.java ) )F.|w
* O>Sbb2q?"
* Created on 2007年1月1日, 下午5:01 QCo^#-
* gvJJ.IX]+
* To change this template, choose Tools | Options and locate the template under 6:!fyia
* the Source Creation and Management node. Right-click the template and choose ZJpI]^9|
* Open. You can then make changes to the template in the Source Editor. lV
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*/ CL*%06QyE
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package com.tot.count; at*=#?M1?
import java.util.*; xpxm9ySwu
/** 4
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* 9VByFQgM
* @author 4_Jdh48-d
*/ c5;ROnTm
public class CountCache { $>UzXhf}\
public static LinkedList list=new LinkedList(); Jc)1}
/** Creates a new instance of CountCache */ XJ\q!{;h
public CountCache() {} 5Z[D(z
public static void add(CountBean cb){ J$Q-1fjj
if(cb!=null){ EyeLC6u
list.add(cb); T82_`u
} YZ>cE#
} g)9/z
} -0`hJ_(
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CountControl.java O>GP>U?]
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/* 39j d}]e
* CountThread.java #r:`bQ0;
* rA`\we)
* Created on 2007年1月1日, 下午4:57 $ZU(bEUOG
* H1[aNwLr
* To change this template, choose Tools | Options and locate the template under zi
,Rk.
* the Source Creation and Management node. Right-click the template and choose h[]N=X
* Open. You can then make changes to the template in the Source Editor. *LRGfk+h
*/ ^sKXn:)
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package com.tot.count; 2z\F m/Z.
import tot.db.DBUtils; IMZKlU3
import java.sql.*; 'dzp@-\
/** L@Z
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* 4.'EEuRw\}
* @author + LwoBn>6
*/ kTz
public class CountControl{ oc(bcU
private static long lastExecuteTime=0;//上次更新时间 rd))H
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 WGmCQE[/c
/** Creates a new instance of CountThread */ eFQi
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public CountControl() {} 4Le5Ms/
public synchronized void executeUpdate(){ Z|c9%.,
Connection conn=null; yLx.*I^6
PreparedStatement ps=null; [q&J"dt
try{ q,DX{:
conn = DBUtils.getConnection(); dX*>?a
conn.setAutoCommit(false); zmFFBf"<
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o0'av+e7
for(int i=0;i<CountCache.list.size();i++){ \bOjb\ w$
CountBean cb=(CountBean)CountCache.list.getFirst(); fhmr*E'J
CountCache.list.removeFirst(); j,xPN=+hT
ps.setInt(1, cb.getCountId()); }gW/heUE
ps.executeUpdate();⑴ w8
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//ps.addBatch();⑵ 6iG<"{/U5
} ib_Gy77Os
//int [] counts = ps.executeBatch();⑶ X6 ,9D[Nw
conn.commit(); <k](s
}catch(Exception e){ wIF
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e.printStackTrace(); !5j3gr~
} finally{ >~rd5xlk
try{ 1Q SIZoK7
if(ps!=null) { yU"G|Ex
ps.clearParameters(); Ij1]GZ`A(
ps.close(); G)hH?_U#T
ps=null; "yTh + =
} a*j <TR
}catch(SQLException e){} j9}0jC2Tb
DBUtils.closeConnection(conn); NE3wui1 V
} p*,P%tX
}
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public long getLast(){ RRqMwy>%
return lastExecuteTime; ib\[ ~rg
} Wk?|BR]O
public void run(){ Vb^s 'k
long now = System.currentTimeMillis(); 4i/q^;`
if ((now - lastExecuteTime) > executeSep) { 0>=)
//System.out.print("lastExecuteTime:"+lastExecuteTime); #2jn4>
//System.out.print(" now:"+now+"\n"); *\KMkx
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); <IyLLQ+v
lastExecuteTime=now; w3qf7{b
executeUpdate(); rA,Y_1b *
} d7J[.^\
else{ q7&yb.<KD.
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); I#t9aR+&
} H?j-=Zka
} 9>3Ltnn0
} sBtG}Mo)
//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 ~'J =!Xy
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类写好了,下面是在JSP中如下调用。 P0 ltN
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<% !X%!7wsc
CountBean cb=new CountBean(); Gv,92ny!|
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 9]@J*A}=l
CountCache.add(cb); f WjS)
out.print(CountCache.list.size()+"<br>"); `qDz=,)WP
CountControl c=new CountControl(); ,{?bM
c.run(); ] ZGvRA&
out.print(CountCache.list.size()+"<br>"); 0ITA3v8{
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