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: 2o1 RJk9
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CountBean.java '
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/* :PP!v!vk
* CountData.java ]lA.?
* yT h60U
* Created on 2007年1月1日, 下午4:44 )P9&I.a8
* E[tEW0ub
* To change this template, choose Tools | Options and locate the template under XT\Q"=FD
* the Source Creation and Management node. Right-click the template and choose GtkZ%<KF9
* Open. You can then make changes to the template in the Source Editor. 6]Ri$V&"
*/ (z^987G
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package com.tot.count; HfA@tZ5q|U
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/** Df0m
* kXW$[R
* @author 7r$'2">K(
*/ )Q c>NF0
public class CountBean { h;t5v6["
private String countType; ux1SQ8C *
int countId; V,>uM
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/** Creates a new instance of CountData */ =R0#WMf$@
public CountBean() {} U\UlQp?
public void setCountType(String countTypes){ )}4xmf@gl
this.countType=countTypes; 6" |+\
} nHIW_+<Mf
public void setCountId(int countIds){ qm|T<zsDY#
this.countId=countIds; Q#sLIZ8=
} |v= */e
public String getCountType(){ 8% `Jf`
return countType; !z?;L_Lb
} 3L-}B#tI
public int getCountId(){
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return countId; >l(|c9OWM
} N.|uPq$R
} Q5/BEUkC
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CountCache.java
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/* k+y>xI,
* CountCache.java H@BU/{
* .dl4f"k
* Created on 2007年1月1日, 下午5:01 VT5o#NR{R
* ^y3snuLtE
* To change this template, choose Tools | Options and locate the template under =Vi>?fWpn=
* the Source Creation and Management node. Right-click the template and choose ljw>[wNv
* Open. You can then make changes to the template in the Source Editor. f>jAu;S
*/ Afo qCF
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package com.tot.count; :WnF>zN
import java.util.*; v= "2p8@F
/** 'I1^70bB
* ahx*Ti/e
* @author zua=E2
*/ .lIkJQ3d
public class CountCache { ylBjuD+
public static LinkedList list=new LinkedList(); @/0-`Y@?
/** Creates a new instance of CountCache */ ~91) DNaE
public CountCache() {} 3ew`e"s
public static void add(CountBean cb){
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if(cb!=null){ iK <vr
list.add(cb); <R@w0b>
} 18kzR6(W
} N!W2O>VS
} >Sua:Uff
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CountControl.java oJbMUEQQq
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/* |XoW
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* CountThread.java z 2Rg`1B
* ={gf x;
* Created on 2007年1月1日, 下午4:57 NY9\a[[^[8
* |*-&x:p7O
* To change this template, choose Tools | Options and locate the template under .iXIoka
* the Source Creation and Management node. Right-click the template and choose B0#JX
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* Open. You can then make changes to the template in the Source Editor. mq*Efb)!
*/ Qfd4")zhG
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package com.tot.count; N)b.$aC
import tot.db.DBUtils; ^YwTO/Q|
import java.sql.*; Zcg@]Sx(I
/** _"R /k`8
* 'k?*?XxG
* @author \C.s%m
*/ tj=l!
public class CountControl{ i$:QOMA
private static long lastExecuteTime=0;//上次更新时间 YdNmnB%J
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -VVJf5/
/** Creates a new instance of CountThread */ ^CWxYDG*
public CountControl() {} 0281"aO
public synchronized void executeUpdate(){ (np60mX<
Connection conn=null; 6o!Y^^/U
PreparedStatement ps=null; 0.}WZAYy~
try{ n~|sMpd,M1
conn = DBUtils.getConnection(); c mI&R(
conn.setAutoCommit(false); WfF~\DlrD
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 0k\BE\PQk
for(int i=0;i<CountCache.list.size();i++){ N(@B3%H2/J
CountBean cb=(CountBean)CountCache.list.getFirst(); oe*Y(T\G
CountCache.list.removeFirst(); WY 'QhieH
ps.setInt(1, cb.getCountId()); 6o4Bf| E]
ps.executeUpdate();⑴ wz{]CQ 7"
//ps.addBatch();⑵ "{F e
} O${B)C,
//int [] counts = ps.executeBatch();⑶ OX!<{9o
conn.commit(); o+j~~P
}catch(Exception e){ z1R_a=7
e.printStackTrace(); PBo;lg`
} finally{ #2qDn^s
try{ VA^yv1We
if(ps!=null) { r{pbUk
ps.clearParameters(); xYUC|c1Q9
ps.close(); K[~fpQGbV1
ps=null; {InD/l'v6n
} _)U[c;^6
}catch(SQLException e){} n?=d)[]
DBUtils.closeConnection(conn); Y)oF;ko:
} 7)U08"
} ;VI/iwg
public long getLast(){ =Mby;wQ?|
return lastExecuteTime; Z\9DtvV
} nhZ^`mP
public void run(){ MJDW-KL-
long now = System.currentTimeMillis(); Q?uHdmY*X
if ((now - lastExecuteTime) > executeSep) { td"D&1eQ@
//System.out.print("lastExecuteTime:"+lastExecuteTime); aI'MVKwMk
//System.out.print(" now:"+now+"\n"); +8#hi5e
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); b|'{f?
lastExecuteTime=now; rOyKugHe
executeUpdate(); Un.u{$po
} a\@k5?
else{ 9H6%\#rw
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ys~oJb~
} {`>;I
} #i1z&b#@
} KdTDBC
//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%mtlA
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类写好了,下面是在JSP中如下调用。 5H!6#pqM
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<% qwomc28O
CountBean cb=new CountBean(); dtDT^~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); $[1J[eY*
CountCache.add(cb); pX LXkF?
out.print(CountCache.list.size()+"<br>"); 7(W"NF{r
CountControl c=new CountControl(); L7rH=gZ&!]
c.run(); .FWi$B';
out.print(CountCache.list.size()+"<br>"); 8[\~}Q6
%>