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: +MbIB&fRCB
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CountBean.java n%R;-?*v
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/* cfox7FmW
* CountData.java IKtB;
* <^b7cOFQ
* Created on 2007年1月1日, 下午4:44 &
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* n,eJ$2!J
* To change this template, choose Tools | Options and locate the template under 50TA:7
* the Source Creation and Management node. Right-click the template and choose -LDCBc"
* Open. You can then make changes to the template in the Source Editor. nVu&/
*/ SvN9aD1
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package com.tot.count; IX: 25CEI2
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/** PiV7*F4qI.
* jztq.2-c#
* @author <PPNhf8
*/ )&era` e[
public class CountBean { lnovykR
private String countType; e{;OSk`x
int countId; O3N0YGhJ
/** Creates a new instance of CountData */ 'Y$R~e^Y?
public CountBean() {} A*./,KT
public void setCountType(String countTypes){ 8ul&x~2;X
this.countType=countTypes; uj%skOD6Z
} KbL V'%D
public void setCountId(int countIds){ Lb{e,JH
this.countId=countIds; KZ!3j_pKy
} DjU9
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public String getCountType(){ 2^t#6XBk/
return countType; pE{yv1Yg
} 7'wS\/e4a
public int getCountId(){ vHAg-Avc
return countId; j8|g!>Nv
} ^gVT$A
} J7C4V'_
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CountCache.java 7nbB^2
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/* U yw-2]!n
* CountCache.java /h v4x9
* :Rs^0F8)c
* Created on 2007年1月1日, 下午5:01 )s1Ib4C
* )}TLC 2%
* To change this template, choose Tools | Options and locate the template under ZEYgK)^
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. o!:8nXw
*/ \4"S7.% |
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package com.tot.count; -XRn~=5
import java.util.*; 7_2kDDW0
/** )BfT7{WN
* #W.vX?-'0
* @author iHf-{[[Z
*/ DzQ1%!
public class CountCache { @/r^%G
public static LinkedList list=new LinkedList(); P}.7Mehf
/** Creates a new instance of CountCache */ 9 Pw0m=4
public CountCache() {} JQ:Ri
public static void add(CountBean cb){ pZ#ap<|>I
if(cb!=null){ ^m_yf|D$
list.add(cb); sH[
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} $A3<G-4O
} RE.r4uOJg
} 56l@a{
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CountControl.java h7s;m
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/* 6<0n *&
* CountThread.java OT^%3:zg
* s4_/&h
* Created on 2007年1月1日, 下午4:57 :';L/x>
* `nUO l
* To change this template, choose Tools | Options and locate the template under l{w#H|]
* the Source Creation and Management node. Right-click the template and choose iCP/P%
* Open. You can then make changes to the template in the Source Editor. LQnkcV
*/ Sx
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package com.tot.count; Z ,^9Z
import tot.db.DBUtils; Av0y?oGH
import java.sql.*; &'l>rD^o
/** x\2?ym@
* 'WHHc 9rG,
* @author GRy-+#,b"
*/ D@EO=08<b
public class CountControl{ /v095H@
private static long lastExecuteTime=0;//上次更新时间 bslrqUk_`=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 @H !$[m3
/** Creates a new instance of CountThread */ xf%4, JQ
public CountControl() {} \,!QJp4
public synchronized void executeUpdate(){ F_xbwa*=
Connection conn=null; 8 i&_Jgmr
PreparedStatement ps=null; ;X ,1I
try{ ]4+s$rG
conn = DBUtils.getConnection(); :a:[.
conn.setAutoCommit(false); JO14KY*%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); C8a*Q"
for(int i=0;i<CountCache.list.size();i++){ yBLK$@9
CountBean cb=(CountBean)CountCache.list.getFirst(); IPuA#C
CountCache.list.removeFirst(); *%Qn{x
ps.setInt(1, cb.getCountId()); LtT\z<bAI
ps.executeUpdate();⑴ ,mPnQ?
//ps.addBatch();⑵ HaA1z}?n
} R];Oxe
//int [] counts = ps.executeBatch();⑶ s=?aox7
conn.commit(); X &2oPo
}catch(Exception e){ JcJmds
e.printStackTrace(); \b}~2oX
} finally{
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try{ P7B:%HiAx
if(ps!=null) { HxK$ 4I`
ps.clearParameters(); 3M5#4n\v$
ps.close(); wix5B@
ps=null; c= UU"
} _DRrznaw
}catch(SQLException e){} -{h
DBUtils.closeConnection(conn); '2hbJk
} K[
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} J H.K.C(
public long getLast(){ s?WCnT
return lastExecuteTime; 66snC{gU
} 5)1+~ B
public void run(){ DOm[*1@^
long now = System.currentTimeMillis(); mq /zTm
if ((now - lastExecuteTime) > executeSep) { `h;k2Se5
//System.out.print("lastExecuteTime:"+lastExecuteTime); 3`9{T>
//System.out.print(" now:"+now+"\n"); `Lyq[zg8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \^*<
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lastExecuteTime=now; 8l/[(] &
executeUpdate(); m}VM+=
} Np)3+!^1"
else{ SEKN|YQV/t
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); K|W^l\Lt
} %IL6ix
} ;D ~L|
} (7lBID4
//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 4yMW^:@
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类写好了,下面是在JSP中如下调用。 Hv#q:R8
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<% x)5V.q
CountBean cb=new CountBean(); Z+s%;f;
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); KB{RU'?f|
CountCache.add(cb); hJ%1
out.print(CountCache.list.size()+"<br>"); ;mm!0]V
CountControl c=new CountControl(); &!7+Yb(1
c.run(); <*'cf2Q$Av
out.print(CountCache.list.size()+"<br>"); @%tXFizh
%>