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: 3/RNStd<L!
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CountBean.java
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/* cp3O$S
* CountData.java Aw7_diK^
* u*<knZ~ty
* Created on 2007年1月1日, 下午4:44 J+f*D+x1
* G>j4b}e
* To change this template, choose Tools | Options and locate the template under DBZ^n9
* the Source Creation and Management node. Right-click the template and choose z-;{pPZ
* Open. You can then make changes to the template in the Source Editor.
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*/ +{H0$4y
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package com.tot.count; nQ^ c{Bm:
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/** 7eQc14
* y[I)hSD=
* @author ^Z:qlYZ
*/ *waaM]u
public class CountBean { H4IJLZ3G
private String countType; U9:I"f,
int countId; 4Y4QR[>IU3
/** Creates a new instance of CountData */ n_MY69W
public CountBean() {} 9*j$U$:'
public void setCountType(String countTypes){ [BKX$A:Y
this.countType=countTypes; j#YPo
} NT<vs"<B
public void setCountId(int countIds){ 3YJa3fflK
this.countId=countIds; q#t&\M.U
} )XoIb[s"
public String getCountType(){ xPorlX)zW
return countType; f|'8~C5I@>
} @0U={qX
public int getCountId(){ h5VZ-v_j
return countId; F4
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} FR? \H"'x
} _jD\kg#LY
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CountCache.java xjg(}w
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/* KBy*QA
* CountCache.java SH/^qDT'
* YuKg|<WO
* Created on 2007年1月1日, 下午5:01 2(K@V6j$M
* 8)51p+a
* To change this template, choose Tools | Options and locate the template under l"1at eM3
* the Source Creation and Management node. Right-click the template and choose Z<@dM2b)
* Open. You can then make changes to the template in the Source Editor. {~+o+LV
*/ C`r{B.t`GT
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package com.tot.count; pkT26)aW
import java.util.*; \9T/%[r#
/** ~Rk~Zn
* yZw5?{g@
* @author ?'+kZ|
*/ .Arcsg
public class CountCache { xdkC>o4>
public static LinkedList list=new LinkedList(); u#~q86k
/** Creates a new instance of CountCache */ &(i_s
public CountCache() {} ;{f4E)t 7
public static void add(CountBean cb){ qttJ*zu
if(cb!=null){ _0E KE
list.add(cb); }>< v7
} qpXsQim$~
} \S[I:fw#&
} kP,^c{
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CountControl.java #f-pkeaeq
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/* RA$q{$arb
* CountThread.java VFLW@
* ~3,k8C"pRq
* Created on 2007年1月1日, 下午4:57 mo
* w
* To change this template, choose Tools | Options and locate the template under ^M~Z_CQL2
* the Source Creation and Management node. Right-click the template and choose mq6TwM
* Open. You can then make changes to the template in the Source Editor.
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*/ y,cz;2
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package com.tot.count; )0N^rw kW
import tot.db.DBUtils; A#KfG1K>
import java.sql.*; %8$ldNhV
/** q3}WO]TBj
* ~1.B
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* @author /YHAU5N/}
*/ VL2+"<
public class CountControl{ ^&Wa?
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private static long lastExecuteTime=0;//上次更新时间 O#72h]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A8U\/GP
/** Creates a new instance of CountThread */ s>c0K@ADO
public CountControl() {} 3*!w c.=
public synchronized void executeUpdate(){ pUD(5v*0R
Connection conn=null; f S-PM3
PreparedStatement ps=null; iM(Q-%HP_
try{ r%412#
conn = DBUtils.getConnection(); t5;)<N`
conn.setAutoCommit(false); gUHx(Fi[4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Ze"m;T
for(int i=0;i<CountCache.list.size();i++){ @e:=
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CountBean cb=(CountBean)CountCache.list.getFirst(); jN T+?2
CountCache.list.removeFirst(); GiS:Nq`$(
ps.setInt(1, cb.getCountId()); "xV0$%
ps.executeUpdate();⑴ 5Vj O:>
//ps.addBatch();⑵ $~)YI/b
} W@FSQ8b>$m
//int [] counts = ps.executeBatch();⑶ 0AD8X+M{P
conn.commit(); ,jq:%Y[KZ
}catch(Exception e){ :b`ywSp`
e.printStackTrace(); 5N(OW:M
} finally{ xZ(ryE%
try{ (C.<H6]=
if(ps!=null) { #6*20w_u
ps.clearParameters(); iOJ5KXrAO
ps.close(); 7^W(e s
ps=null; J^y?nE(j
} /X;/}fk
}catch(SQLException e){} j06qr\Es
DBUtils.closeConnection(conn); PWk\#dJN&
} r t'pc\|O&
} Fxv5kho
public long getLast(){ mnL+@mm
return lastExecuteTime; nZ %%{#T7
} 5jAS1XG
public void run(){ %00cC~}4
long now = System.currentTimeMillis(); (z 9M
if ((now - lastExecuteTime) > executeSep) { )f,9 h
//System.out.print("lastExecuteTime:"+lastExecuteTime); m^gxEPJK
//System.out.print(" now:"+now+"\n"); #7['M;_
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); `!Yd$=*c_&
lastExecuteTime=now; #\Zr$?t|V
executeUpdate(); eI,H
} 2{<o1x,Ym
else{ \![ p-mW{
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); *-(8Z>9
} 6{!Cx9V
} DM,)nh6'
} kgh0
//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 s;cGf+
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类写好了,下面是在JSP中如下调用。 Zm*q V!
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<% 89Ir}bCr
CountBean cb=new CountBean(); :!ablO~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); WG*),P?
CountCache.add(cb); A DVUx}
out.print(CountCache.list.size()+"<br>"); ZvwU
CountControl c=new CountControl(); *vzEfmN:d
c.run(); }0,dG4Oo=
out.print(CountCache.list.size()+"<br>"); N}>[To3
%>