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: ~.lPEA %%
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CountBean.java -RK- Fu<e
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/* r-/`"j{O!
* CountData.java %GIr&V4|
* G;XxBA
* Created on 2007年1月1日, 下午4:44 -+-_I*(
* SOvF[,+
* To change this template, choose Tools | Options and locate the template under njA#@fU
* the Source Creation and Management node. Right-click the template and choose L\z~uo3:
* Open. You can then make changes to the template in the Source Editor. Yk Qd
*/ 57'4ljvYi
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package com.tot.count; @49S`
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/** G'aDb/
* P J[`|
* @author WvZ8/T'x
*/ -!]ZMi9
public class CountBean { ^@NU}S):yN
private String countType; )B8$<sv
int countId; WQO) =n
/** Creates a new instance of CountData */ t}/( b/VD
public CountBean() {} c<$OA=n
public void setCountType(String countTypes){ OY@ %p}l
this.countType=countTypes;
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} @cB$iP=Z4
public void setCountId(int countIds){ Aj]V`B:65
this.countId=countIds; W#3Q ^Z?
} \=0Vi6!Mc
public String getCountType(){ G+\GaY[
return countType; I`4*+a'q&
}
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public int getCountId(){ WaR`Kp+>
return countId; f^XOUh
} %&t<K3&Yh
} xe&i^+i
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CountCache.java l"]}Ts#
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/* $(>+VH`l
* CountCache.java [RTs[3E^
* Pw!MS5=r
* Created on 2007年1月1日, 下午5:01 d <JM36j?
* x>`%DwoRI
* To change this template, choose Tools | Options and locate the template under BbS4m
* the Source Creation and Management node. Right-click the template and choose QbpFE)TYJ|
* Open. You can then make changes to the template in the Source Editor. i9][N5\$
*/ r#]WI|
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package com.tot.count; <1\Nb{5
import java.util.*; F;0}x;:>
/** ,f;}|d:r
* LW_f
* @author G?/DrnK:
*/ =]Jd9]vi
public class CountCache { rFYWs6
public static LinkedList list=new LinkedList(); WKa~[j|-K
/** Creates a new instance of CountCache */ 7CTFOAx#
public CountCache() {} mk+B9?;cF-
public static void add(CountBean cb){ tc{sB\&-
if(cb!=null){ +l{=
list.add(cb); h6`6tk
} ;&-k#PE]/H
} %
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} }"!I[Ek> y
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CountControl.java eu|;eP-+d
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/* T&o(N3lW
* CountThread.java @>>~CZ`l
* yx&51G$
* Created on 2007年1月1日, 下午4:57 /F'sb[
* 0-yp,G
* To change this template, choose Tools | Options and locate the template under H{?vbqQ
* the Source Creation and Management node. Right-click the template and choose K\6u9BYG
* Open. You can then make changes to the template in the Source Editor. 91-o}|3v
*/ 1--C~IjJ+
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package com.tot.count; 90*5
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import tot.db.DBUtils; 6){]1h"
import java.sql.*; 3e;^/kf<9
/**
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* kbMWGB%;
* @author qPy1;maXP
*/ (w/T-*
public class CountControl{ (VEpVn3{
private static long lastExecuteTime=0;//上次更新时间 K<ft2anY5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒
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/** Creates a new instance of CountThread */ MUREiL9L|
public CountControl() {} }Nm#q@o$P
public synchronized void executeUpdate(){ cacr=iX
Connection conn=null; :^WKT
PreparedStatement ps=null; _ff`y
try{ dj7hx"BI
conn = DBUtils.getConnection(); r6}
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conn.setAutoCommit(false); D rHVG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); q?DTMKx
for(int i=0;i<CountCache.list.size();i++){ GyIT{M}KV
CountBean cb=(CountBean)CountCache.list.getFirst(); '~[d=fwH
CountCache.list.removeFirst(); *|>d
ps.setInt(1, cb.getCountId()); fW3(&@
ps.executeUpdate();⑴ -Rd/Gx
//ps.addBatch();⑵ T| V:$D'
} ke]Lw
//int [] counts = ps.executeBatch();⑶ nvJf/90$
conn.commit(); 4@n1Uk
}catch(Exception e){ D=m9fFz
e.printStackTrace(); ;/fF,L{c
} finally{ vss(twg
try{ UU mTOJr
if(ps!=null) { 1V4s<m>#
ps.clearParameters(); m4&h>9. 8
ps.close(); uK$9Ll{lk
ps=null; r(aLEJ"u?
} o-{[|/)Tk
}catch(SQLException e){} , 5kKimTt
DBUtils.closeConnection(conn); K/b_22]CC
} wrbLDod /
} I)cFG{~L
public long getLast(){ )-
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return lastExecuteTime; cc&axc7I
} ujaGNg?,
public void run(){ /#-C4"|
long now = System.currentTimeMillis(); fA<[f
if ((now - lastExecuteTime) > executeSep) { *:t|qgJI#+
//System.out.print("lastExecuteTime:"+lastExecuteTime); XZJ+h,f
//System.out.print(" now:"+now+"\n"); P 8>d6;o($
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #PanfYR
lastExecuteTime=now; 8lb%eb]U
executeUpdate(); ph [#QHB
} n'01Hh`0
else{ 8X`tU<Ab
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); .ir<s>YM
} .0iQad&duh
} x&9hI
} C\nhqkn
//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 6morum
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类写好了,下面是在JSP中如下调用。
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<% [}8|R0KF
CountBean cb=new CountBean(); 2?,EzBeal
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ->O2I?
CountCache.add(cb); W#BM(I
out.print(CountCache.list.size()+"<br>"); x~{;TZa[I
CountControl c=new CountControl(); rN<