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: |QTqa~~B
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CountBean.java
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/* W#_gvW
* CountData.java bnY8.Lpf|
* q[+:t
* Created on 2007年1月1日, 下午4:44 j=QR*8*
* Ci9wF(<k
* To change this template, choose Tools | Options and locate the template under &r5%WRzpYT
* the Source Creation and Management node. Right-click the template and choose Z*aU2Kr`;
* Open. You can then make changes to the template in the Source Editor. 78J.~v/
*/ 0@x$Cp
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package com.tot.count; la|l9N^,
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/** 2pNJWYW"
* d*(Bs$De
* @author 2OlC7X{
*/ vk+%#w
public class CountBean { [Q_|6Di
private String countType; ;~$ $WU
int countId; "57G@NC{n
/** Creates a new instance of CountData */ ,vw`YKg
public CountBean() {} Pc4cSw#5
public void setCountType(String countTypes){ &0Zk3D4
this.countType=countTypes; -vfu0XI~
} YgOgYo{E!
public void setCountId(int countIds){ l"y9XO|
this.countId=countIds; H>X1(sh#}
} #|h8u`
public String getCountType(){ HwMsP$`q
return countType; Mf13@XEo
} G*p.JsZP
public int getCountId(){ \#7%%>p=O'
return countId; ~cj:AIF
} ms<u YLp
} ?Cfp=85ea!
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CountCache.java <f{`}drp/
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/* ~6i mkv^ F
* CountCache.java EoWzHa
* I19F\
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* Created on 2007年1月1日, 下午5:01 bO3KaOC8N
* ,.MG&O
* To change this template, choose Tools | Options and locate the template under 2+cicBD
* the Source Creation and Management node. Right-click the template and choose ;K-t
* Open. You can then make changes to the template in the Source Editor. Vzm7xl [
*/ iGNKf|8{
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package com.tot.count; c2:kZxT
import java.util.*; v~QZO4['
/** 98nLj9
* aJ;R8(*;\
* @author 0LuY"(LR
*/ NZ9,9
public class CountCache { o;/F=Zp
public static LinkedList list=new LinkedList(); 7O :Gi*MA
/** Creates a new instance of CountCache */ o|E(_Y4d
public CountCache() {} v3#47F)
public static void add(CountBean cb){ B%;+8]
if(cb!=null){ <WkLwP3^
list.add(cb); `P*j~ZLlXN
} <rxem(PPu
} ]HT>-Ba;{h
} )+R3C%
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CountControl.java #2,L)E\G8e
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/* C,.{y`s'
* CountThread.java -W vAmi
* NKYyMHv6
* Created on 2007年1月1日, 下午4:57 '11h Iu=:
* wO
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* To change this template, choose Tools | Options and locate the template under {'C74s
* the Source Creation and Management node. Right-click the template and choose Vdyx74xX
* Open. You can then make changes to the template in the Source Editor. aW5~z^I
*/ 0C_Qp% Z
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package com.tot.count; 6h8NrjX
import tot.db.DBUtils; 8yl/!O,v
import java.sql.*; f}3bYF
/** vi|ASA{V
* #y%Ao\~kG
* @author _bsfM;u.%
*/ %VZ\4+8S
public class CountControl{ b2H6}s"=w
private static long lastExecuteTime=0;//上次更新时间 cMAfW3j: ;
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 UzXbaQQ2g
/** Creates a new instance of CountThread */
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public CountControl() {} beoMLHp
public synchronized void executeUpdate(){ 7#QH4$@1P
Connection conn=null; "w1jr 6"
PreparedStatement ps=null; CPG %*E*
try{ j>zVC;Sj*
conn = DBUtils.getConnection(); aleIy}"
conn.setAutoCommit(false); 38^_(N
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !b=$FOC>
for(int i=0;i<CountCache.list.size();i++){ g!UM8I-$
CountBean cb=(CountBean)CountCache.list.getFirst(); m? hX=
CountCache.list.removeFirst(); *']RYu?X
ps.setInt(1, cb.getCountId()); glpdYg *
ps.executeUpdate();⑴ 6(=:j"w0
//ps.addBatch();⑵ <j'#mUzd
} s+11) ~
//int [] counts = ps.executeBatch();⑶ $?YkgK
conn.commit(); B~IOM
}catch(Exception e){ {iv=KF_S_
e.printStackTrace(); =O<BMq{d
} finally{ /k,p]/e
try{ :|g{gi
if(ps!=null) { :H{8j}"
ps.clearParameters(); s_N!6$tS
ps.close(); d8>D=Ve
ps=null; ZmDr$iU~
} JC-L80-
}catch(SQLException e){} y[vjqfdmU
DBUtils.closeConnection(conn); STMcMm3
} Z3d&I]Tf
} ]_h"2|
public long getLast(){ %-dGK)?
return lastExecuteTime; sC
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} Q1rwTg\
public void run(){ xab[
long now = System.currentTimeMillis(); H>B:jJf
if ((now - lastExecuteTime) > executeSep) { 4_ 3\4
//System.out.print("lastExecuteTime:"+lastExecuteTime); UkUdpZ.[il
//System.out.print(" now:"+now+"\n"); Yr!3mU-Uvt
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8K qv)FjB
lastExecuteTime=now; CH2o[&
executeUpdate(); P*}Oi7Z
} laAG%lq/'
else{ _LK(j;6K}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); qxq ~9\My
} !tVV +vT#
}
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} Sb<=ROCg@
//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 gaJS6*P#
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类写好了,下面是在JSP中如下调用。 607#d):Y
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<% #M:W?&.
CountBean cb=new CountBean(); IL<5Suz:
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); kAqk~.
CountCache.add(cb); e='3gzz
out.print(CountCache.list.size()+"<br>"); 6>l-jTM
CountControl c=new CountControl(); >0> M@s
c.run(); =zsXa=<
out.print(CountCache.list.size()+"<br>"); #xO`k1W.
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