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: LGue=Hkp
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CountBean.java '
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/* &_TjRj"
* CountData.java x6mq['_
* ."g5+ xX
* Created on 2007年1月1日, 下午4:44 ]uXsl0'`V
* Ho*RLVI0U
* To change this template, choose Tools | Options and locate the template under Aba%Gh
* the Source Creation and Management node. Right-click the template and choose \{^yB4F_Z
* Open. You can then make changes to the template in the Source Editor. ?DTP-#5Ba
*/ h1d0{
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package com.tot.count; H s 3*OhK\
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/** v[=E f
* im%3*bv-
* @author 2n,73$s
*/ 833t0Ml1A/
public class CountBean { "+C\f)
private String countType; y^fU_L?p
int countId; sX?7`n1U
/** Creates a new instance of CountData */ UjK&`a;V
public CountBean() {} SQ.Wj?W)
public void setCountType(String countTypes){ Dy'l]vN$
this.countType=countTypes; qt;Tfuo
} J #5o
public void setCountId(int countIds){ s: .XF|e{
this.countId=countIds; |1 6v4 R
} pNsLoNZ3w
public String getCountType(){ z-E4-\a
return countType; ^vz@d+\Kd
} \d`Sz
*
public int getCountId(){ LR.+CxQ
return countId; u 9TlXn
} #.xTAvD
} ~#Mx&mZ
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CountCache.java xL"o)]a=
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/* S}I=i>QB
* CountCache.java {iteC
* 1Ac1CsK*
* Created on 2007年1月1日, 下午5:01 g0$k_
* f@g
* To change this template, choose Tools | Options and locate the template under t9l7
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* the Source Creation and Management node. Right-click the template and choose VAzJclB
* Open. You can then make changes to the template in the Source Editor. i`spM<iR.
*/ SZ){1Hu
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package com.tot.count; _ h-X-s Y
import java.util.*; 32/P(-
/** cW%O-
* jg/<"/E
* @author fL:Fn"Nv
*/ BS.6d}G4
public class CountCache { nJ@hzK.
public static LinkedList list=new LinkedList(); {bEEQCweNJ
/** Creates a new instance of CountCache */ |
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public CountCache() {} ZJm^znpw6
public static void add(CountBean cb){ "xI[4~'`:
if(cb!=null){ +.uk#K0o
list.add(cb); ' 1nU[,Wj
} |Q;1;QXd
} T`;M!-)2
} 5Yr$dNe
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CountControl.java U0T N8O}Z
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/* g{(nt5|^l
* CountThread.java >4b39/BM
* z5/O8}Gz@
* Created on 2007年1月1日, 下午4:57 </p.OaNe
* %W+Fe,]
* To change this template, choose Tools | Options and locate the template under CB1u_E_
* the Source Creation and Management node. Right-click the template and choose &o.SmkJI
* Open. You can then make changes to the template in the Source Editor. z w9r0bG
*/ 9\2&6H
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package com.tot.count; !}7m^
import tot.db.DBUtils; aQFHB!
import java.sql.*; p-k qX
/** -GjJrYOU
* :Yqa[._AF
* @author _Ohq'ZgXm
*/ r1]e:
public class CountControl{ @xEQ<g
private static long lastExecuteTime=0;//上次更新时间 J>35q'nN]F
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 :P~Owz
/** Creates a new instance of CountThread */ 7a net
public CountControl() {} w (1a{m?ht
public synchronized void executeUpdate(){ ,,gYU_V
Connection conn=null; @d|9(,Q
PreparedStatement ps=null; x
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try{ sn%fE
conn = DBUtils.getConnection(); o5uwa{v
conn.setAutoCommit(false); KMcP !N.I
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); |zKcL3*
for(int i=0;i<CountCache.list.size();i++){ g~b'}^J
CountBean cb=(CountBean)CountCache.list.getFirst(); tHeLq*))
CountCache.list.removeFirst(); >wwEa4
ps.setInt(1, cb.getCountId()); %b9M\
ps.executeUpdate();⑴ f -5ZXpWs'
//ps.addBatch();⑵ 9m{rQ P/
} QZo l(2~Y
//int [] counts = ps.executeBatch();⑶ D.?gV_
conn.commit(); '-=?lyKv
}catch(Exception e){ %s>E@[s
e.printStackTrace(); /Z_QCj
} finally{ 75f.^4/%
try{ "?SnA +)
if(ps!=null) { |*i-Q @
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ps.clearParameters(); WW=7QCi
ps.close(); ?|\Lm3%J
ps=null; S8l+WF4q
} kTV D4Z=
}catch(SQLException e){} Tx_LH"8
DBUtils.closeConnection(conn); oLoa71Q}
} 0P 42C{>'w
} 5]E5 V@C
public long getLast(){ ?$Pj[O^hl
return lastExecuteTime; ~m7+^c@,
} vNIQc "\-
public void run(){ ,U}8(D~:
long now = System.currentTimeMillis(); 75y#^pD?c
if ((now - lastExecuteTime) > executeSep) { b%(0AL
//System.out.print("lastExecuteTime:"+lastExecuteTime); <>TBM^
//System.out.print(" now:"+now+"\n"); {;U:0BPI3
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Nsq%b?#
lastExecuteTime=now; =[kv@p
executeUpdate(); UuGv= yC^6
} ^&By