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: 10<x.8fSP
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CountBean.java 8oUpQcim
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/* e,F1Xi#d
* CountData.java Mr;E<Lj ^K
* (qqOjz
* Created on 2007年1月1日, 下午4:44 F~%]6^$w
* LR.Hh
* To change this template, choose Tools | Options and locate the template under t]y
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* the Source Creation and Management node. Right-click the template and choose dx;Ysn0-
* Open. You can then make changes to the template in the Source Editor. Kqp(%8mf
*/ KM}f:_J*lg
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package com.tot.count; bvv|;6
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/** q*\x0"mS/
* U]^HjfX\
* @author <KE 1f7c
*/ ;3d"wW]}7K
public class CountBean { ]w;rfn9D
private String countType; P;P%n
int countId; m@"QDMHk.
/** Creates a new instance of CountData */ D2](da:]8)
public CountBean() {} jX3,c%aQ5e
public void setCountType(String countTypes){ ?&|5=>u2}$
this.countType=countTypes; kSR\RuY*
} =+U `-J}g
public void setCountId(int countIds){ plb!.g
this.countId=countIds; 3&u&x(
} (yF:6$:#
public String getCountType(){ a=DcZ_M
return countType; IPgt|if^
} aa>xIW,u
public int getCountId(){ r<K(jG[:{f
return countId; A6:es_
} .2%zC & ;
} ^Wc@oa`
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CountCache.java &d"G/6
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/* ep2k%?CX 1
* CountCache.java x$1]M DAGb
* wQe_vY
* Created on 2007年1月1日, 下午5:01 9?0^ap,T
* 2Ou[u#H
* To change this template, choose Tools | Options and locate the template under +)y^'Qs
* the Source Creation and Management node. Right-click the template and choose `glBV`?^
* Open. You can then make changes to the template in the Source Editor. =&,]Z6{>
*/ GH+r?2<
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package com.tot.count; fjU8gV
import java.util.*; '7+4`E
/** c17_2 @N
* *Eo?k<:zPm
* @author +n#V[~~8AI
*/ _~piZmkG$
public class CountCache { AS\F{ !O
public static LinkedList list=new LinkedList(); F )W:
/** Creates a new instance of CountCache */ s (zL
public CountCache() {} .u4
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public static void add(CountBean cb){ ZaL.!g
if(cb!=null){ B5X(ykaX~
list.add(cb); #)C[5?{SNq
} CbwJd5tk
} P%#<I}0C
} CitDm1DXt/
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CountControl.java ;\=M;Zt
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/* K#pNec
* CountThread.java ApAO/q
* MBqt&_?K
* Created on 2007年1月1日, 下午4:57 >AcrG]
* _i20|v
* To change this template, choose Tools | Options and locate the template under wS%Q<uK
* the Source Creation and Management node. Right-click the template and choose X4 A<[&F/
* Open. You can then make changes to the template in the Source Editor. hRK/T7v
*/ kzt(i Y_6
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package com.tot.count;
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import tot.db.DBUtils; vTJ}8
import java.sql.*; %k'!Iq+
/** c.>oe*+
* :TJv=T'p'
* @author jO!y_Y]B
*/ O"F_*
public class CountControl{ R}q>O5O
private static long lastExecuteTime=0;//上次更新时间 r\/9X}y4z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 UFp,a0|
/** Creates a new instance of CountThread */ oxz OA
public CountControl() {} A'jP7P
public synchronized void executeUpdate(){ joiL{
Connection conn=null; "4uS3h2r
PreparedStatement ps=null; C/TF-g-_Y
try{ e>(<eu~P
conn = DBUtils.getConnection(); TWQG591
conn.setAutoCommit(false); f!!V${)X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); X@K-^8
for(int i=0;i<CountCache.list.size();i++){ E0MGRI"me
CountBean cb=(CountBean)CountCache.list.getFirst(); _nbBIaHN{
CountCache.list.removeFirst(); `C$:Yf]%nG
ps.setInt(1, cb.getCountId()); bO'Sgc[]
ps.executeUpdate();⑴ i`dCG[
//ps.addBatch();⑵ =8; {\
} aC%m- m
//int [] counts = ps.executeBatch();⑶ uF1~FKB
conn.commit(); @U3Vc|
}catch(Exception e){ b\-&sM(W"
e.printStackTrace(); f]JM /
} finally{ K }Vv4x1U
try{ XqW@rU
if(ps!=null) { ]3KhgK%c8
ps.clearParameters(); CS==A57I
ps.close(); li0i"
ps=null; v?&
-xH-S
} 763v
}catch(SQLException e){} IHJ=i-
DBUtils.closeConnection(conn); oAPb*;}
} H\qC["
} YN!>}
public long getLast(){
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return lastExecuteTime; &Nczv"TM
} m0c P (
public void run(){ rzh#CnL3
long now = System.currentTimeMillis(); pO ml8SQf
if ((now - lastExecuteTime) > executeSep) { %2XHNW
//System.out.print("lastExecuteTime:"+lastExecuteTime); z#]Jv!~EPE
//System.out.print(" now:"+now+"\n"); v(EEG/~
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (&+kl q
lastExecuteTime=now; 0Sgaem`
executeUpdate(); :yeq(oK,
} dv.(7Y7.x
else{ b+f'[;
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); mxz-4.
} 0el9&l9Ew
} &8] d }-e
} HmiJ~C_v`:
//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 t5#rps\;
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类写好了,下面是在JSP中如下调用。 qL6
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<% BI $
CountBean cb=new CountBean(); m3mp/g.>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); !!`!|w
CountCache.add(cb); 't6V:X
out.print(CountCache.list.size()+"<br>"); /)4I|"}R0I
CountControl c=new CountControl(); [$ejp>'Ud
c.run(); |b|&XB_<]Z
out.print(CountCache.list.size()+"<br>"); )*,5"CO
%>