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:
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CountBean.java "5Uh<X
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/* CSTI?A"P
* CountData.java At6qtoPRA
* F'JY?
* Created on 2007年1月1日, 下午4:44 MFt*&%,JX
* VZy4_v=
* To change this template, choose Tools | Options and locate the template under w Q+8\ s=
* the Source Creation and Management node. Right-click the template and choose LD>\#q8a*
* Open. You can then make changes to the template in the Source Editor. ]m4OIst
*/ p|+B3
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package com.tot.count; 0d^Z uTN
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/** e>}}:Ud
* (`BSVxJH
* @author Q`%R[#
*/ T ?Fcohz(
public class CountBean { g(C|!}ex/
private String countType; ln!'_\{
int countId; (ljF{)Ml+=
/** Creates a new instance of CountData */ ])DX%$f
public CountBean() {} _>m-AI4^
public void setCountType(String countTypes){ D${={x
this.countType=countTypes; }8-\A7T
} ZR0r>@M3v<
public void setCountId(int countIds){ 7nU6k%_ %
this.countId=countIds; l_rn++
} L!Cz'm"Nl
public String getCountType(){ !v.9"!' N
return countType; Pmg)v!"
} . @q-B+Eg
public int getCountId(){ iRV~Il#~!
return countId; FR[ B v
} fvq,,@23
} 8eBOr9l+j
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CountCache.java }x0- V8
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/* ;Q;[*B=kE
* CountCache.java wC_l@7t
* epHJ@ W@#
* Created on 2007年1月1日, 下午5:01 nlYR-.
* YevyN\,}V!
* To change this template, choose Tools | Options and locate the template under M:KbD|
* the Source Creation and Management node. Right-click the template and choose G!N{NCq
* Open. You can then make changes to the template in the Source Editor. RyJ 1mAC
*/ JA)?p{j
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package com.tot.count; V
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import java.util.*; ?~"bR%
/** M 3 '$[
* f/,>%j=Ms
* @author _@mRb^
*/ )tHaB,
public class CountCache { aNn"X y\ k
public static LinkedList list=new LinkedList(); #`TgZKDg2
/** Creates a new instance of CountCache */ TGXa,A{
public CountCache() {} B
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public static void add(CountBean cb){ >(w2GD?
if(cb!=null){ | Xi%
list.add(cb); `p
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} 3A:q7#m
} n<sd!xmqFx
} ,;?S\V
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CountControl.java \<Sv3xy&O
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/* Hs?e0Z=N
* CountThread.java E!BPE>
* 7]xm2CHx5
* Created on 2007年1月1日, 下午4:57 Pg9hW
* t^]$!H
* To change this template, choose Tools | Options and locate the template under fkSO( C)
* the Source Creation and Management node. Right-click the template and choose /-bF$)vN
* Open. You can then make changes to the template in the Source Editor. ^D^4
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*/ -K,-h[o
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package com.tot.count; ^-mRP\5
import tot.db.DBUtils; S##1GOO
import java.sql.*; WwH+E]^e+
/** SG}V[Glk
*
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* @author 6qN~/TnHZ
*/ fO'Wj`&a
public class CountControl{ 0]QRsVz+
private static long lastExecuteTime=0;//上次更新时间 ETp%s{8
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )"zvwgaW
/** Creates a new instance of CountThread */ I? THa<
public CountControl() {} alh >"9~!
public synchronized void executeUpdate(){ DRqZ,[!+
Connection conn=null; o1&:ry
PreparedStatement ps=null; -<jL~][S
try{ v_e9}yI
conn = DBUtils.getConnection(); J"=1/,AS
conn.setAutoCommit(false); ;.xoN|Per
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J q{7R
for(int i=0;i<CountCache.list.size();i++){ xtPLR/Z
CountBean cb=(CountBean)CountCache.list.getFirst(); Wg{k$T_>
CountCache.list.removeFirst(); Go,N>HN
ps.setInt(1, cb.getCountId()); WN(ymcdYB
ps.executeUpdate();⑴ h)~=Dm
//ps.addBatch();⑵ m)V/L]4
} f\'{3I29
//int [] counts = ps.executeBatch();⑶ !O\;Nua
conn.commit(); (feTk72XX
}catch(Exception e){ '$4O!YI9@
e.printStackTrace(); e%8|<g+n6
} finally{ 8WE{5#oi
try{ 0 a]/%y3V
if(ps!=null) { ??TMSH
ps.clearParameters(); ^c~)/F/cF
ps.close(); LjL[V'JL
ps=null; f.24:Dw,
} ~GE$myUT\p
}catch(SQLException e){} E?(xb B
DBUtils.closeConnection(conn); o=FE5"t
} eC5 $#,HiC
} #%J5\+ua
public long getLast(){ $+.l*]
return lastExecuteTime; $$:ZX
} $/6;9d^
public void run(){ 2[0JO.K
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long now = System.currentTimeMillis(); G'YH6x,
if ((now - lastExecuteTime) > executeSep) { omWJJ|b~
//System.out.print("lastExecuteTime:"+lastExecuteTime); ikE<=:pe
//System.out.print(" now:"+now+"\n"); u77E! z4Uz
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); vI$t+m:
lastExecuteTime=now; %| G"-%_E
executeUpdate(); q+B&orp
} !`!| Zw
else{ ~Lc066bLeq
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); XqM3<~$
} cYXM__
} /1?R?N2>0
} @HZKc\1
//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 cRX~z
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类写好了,下面是在JSP中如下调用。 }j,[ 1@S
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<% jx Jv.
CountBean cb=new CountBean(); }|%eCVB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ?g!V!VS2
CountCache.add(cb); P/&]?f0/
out.print(CountCache.list.size()+"<br>"); ''\;z<v
CountControl c=new CountControl(); &3J@BMYp
c.run(); drsB/
out.print(CountCache.list.size()+"<br>"); -W,}rcj*|
%>